View DER-120_1232150.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

Design Example Report
Title Specification Application Author Document Number Date Revision 22 W Triple Output Flyback Converter using DPA424R Input: 28 - 60 VDC Output: 3.3 V / 2 A, 9 V / 0.6 A, 24 V / 0.4 A Security Camera Power Integrations Applications Department DER-120 October 26, 2005 1.0
Summary and Features * * * Low parts Count High-Efficiency ~80% 48 VDC Input and Full Load Good cross-regulation
The products and applications illustrated herein (including circuits external to the products and transformer construction) may be covered by one or more U.S. and foreign patents or potentially by pending U.S. and foreign patent applications assigned to Power Integrations. A complete list of Power Integrations' patents may be found at www.powerint.com.
Power Integrations 5245 Hellyer Avenue, San Jose, CA 95138 USA. Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-120
22 W Triple Output Flyback - DPA424R
October 26, 2005
Table Of Contents
Introduction ............................................................................................................................4 Power Supply Specification ...................................................................................................5 Schematic ..............................................................................................................................6 Circuit Description..................................................................................................................7 4.1 Input EMI filtering............................................................................................................7 4.2 Output Rectification ........................................................................................................7 4.3 Output Feedback ............................................................................................................7 5 PCB Layout............................................................................................................................8 6 Bill Of Materials......................................................................................................................9 6.1 Triple Output Flyback Converter.....................................................................................9 7 Transformer Specification ....................................................................................................10 7.1 Electrical Specifications ................................................................................................10 7.2 Materials .......................................................................................................................10 7.3 Transformer Build Diagram...........................................................................................11 7.4 Transformer Construction .............................................................................................11 8 Transformer Spreadsheets ..................................................................................................12 9 Performance Data................................................................................................................13 9.1 Cross Regulation Matrix ...............................................................................................13 9.2 Regulation ....................................................................................................................14 9.2.1 LINE ......................................................................................................................14 9.2.2 LOAD.....................................................................................................................15 10 Waveforms .......................................................................................................................16 10.1 Drain Voltage, Normal Operation..................................................................................16 10.2 Output Voltage Start-up Profile.....................................................................................17 10.3 Load Transient Response (0.75 A to 2 A Load Step) ...................................................18 10.4 Output Ripple Measurements .......................................................................................19 10.4.1 Ripple Measurement Technique............................................................................19 10.4.2 Measurement Results at 48 VDC ..........................................................................20 11 Control Loop Measurements ............................................................................................21 11.1 Maximum Load .............................................................................................................21 11.2 Minimum Load ..............................................................................................................22 12 Revision History ...............................................................................................................24 1 2 3 4
Page 2 of 25
Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-120
22 W Triple Output Flyback - DPA424R
October 26, 2005
List Of Figures
Figure 1 - Populated Circuit Board (Top-side)..............................................................................4 Figure 2 - Schematic ....................................................................................................................6 Figure 3 - Printed Circuit Layout...................................................................................................8 Figure 4 - Transformer Diagram.................................................................................................10 Figure 5 - Transformer Cross-Section........................................................................................11 Figure 6 - Line Regulation, Full Load .........................................................................................14 Figure 7 - Load Regulation, 28 V and 60 VDC Input ..................................................................15 Figure 8 - 48 VDC, No Load.......................................................................................................16 Figure 9 - 48 VDC Input, Full Load.............................................................................................16 Figure 10 - 48 VDC, Minimum Load...........................................................................................16 Figure 11 - 60 VDC Input, Full Load...........................................................................................16 Figure 12 - Start-up Profile, 48 VDC No Load T: 10msec/div.....................................................17 Figure 13 - Start-up Profile, 48 VDC Full Load T: 10msec/div ...................................................17 Figure 14 - Transient Response Top: Load Current; 1 A/div. Bottom: +3.3 V Output 100 mV, 1ms/div. ...............................................................................................................................18 Figure 15 - Oscilloscope Probe Prepared for Ripple Measurement. (End Cap and Ground Lead Removed) ............................................................................................................................19 Figure 16 - Oscilloscope Probe with Probe Master 5125BA BNC Adapter. (Modified with wires for probe ground for ripple measurement, and two parallel decoupling capacitors added)..19 Figure 17 - +3.3 V Ripple, Full Load, 20mV/div; T: 2usec/div ....................................................20 Figure 18 - +9 V Ripple, Full Load, 50mV/div; T: 2usec/div .......................................................20 Figure 19 - +24 V Ripple, Full Load, 50mV/div; T: 2usec/div .....................................................20 Figure 20 - Gain-Phase Plot, 28VDC Input Maximum Steady State Load Vertical Scale: Gain = 8 dB/div, Phase = 40 /div. Crossover Frequency = 4.55 kHz Phase Margin = 49.4..........21 Figure 21 - Gain-Phase Plot, 48VDC Input Maximum Steady State Load Vertical Scale: Gain = 8 dB/div, Phase = 40 /div. Crossover Frequency = 2.23 kHz Phase Margin = 63.7..........21 Figure 22 - Gain-Phase Plot, 60 VDC Input Maximum Steady State Load Vertical Scale: Gain = 8 dB/div, Phase = 40 /div. Crossover Frequency = 2.27 kHz Phase Margin = 76.7..........22 Figure 23 - Gain-Phase Plot, 28 VDC Input Minimum Load Vertical Scale: Gain = 8 dB/div, Phase = 40 /div. Crossover Frequency = 4.97 kHz Phase Margin = 74.8.........................22 Figure 24 - Gain-Phase Plot, 48 VDC Input Minimum Load Vertical Scale: Gain = 8 dB/div, Phase = 40 /div. Crossover Frequency = 1.28 kHz Phase Margin = 76.1.........................23 Figure 25 - Gain-Phase Plot, 60 VDC Input Minimum Load Vertical Scale: Gain = 8 dB/div, Phase = 40 /div. Crossover Frequency = 896Hz Phase Margin = 53.98 ..........................23
Important Note: This board is designed to be non-isolated. However the outputs are high voltage so please take the necessary safety precautions. Design Reports contain a power supply design specification, schematic, bill of materials, and transformer documentation. Performance data and typical operation characteristics are included. Typically only a single prototype has been built.
Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
Page 3 of 25
DER-120
22 W Triple Output Flyback - DPA424R
October 26, 2005
1 Introduction
This document is an engineering report describing a triple output Flyback converter employing the DPA424R. The input voltage range is 28 to 60 VDC providing a regulated +3.3 V at 2 A and a cross-regulated +9 V @ 0.6 A and +24 V @ 0.4 A. This document contains the power supply specification, schematic, and bill of materials, transformer documentation, printed circuit layout, and performance data.
+VIN
+3.3V
-VIN
GND
+9V GND +24V
Figure 1 - Populated Circuit Board (Top-side).
Page 4 of 25
Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-120
22 W Triple Output Flyback - DPA424R
October 26, 2005
2 Power Supply Specification
Description Input Voltage No-load Input Power (60VDC) Output Output Voltage 1 Output Ripple Voltage 1 Output Current 1 Output Voltage 2 Output Ripple Voltage 2 Output Current 2 Output Voltage 3 Output Ripple Voltage 3 Output Current 3 Total Output Power Continuous Output Power Peak Output Power Efficiency Ambient Temperature Symbol VIN Min 28 Typ 48 Max 60 1.2 3.465 50 2 9.90 200 0.6 26.4 300 0.4 Units VDC W V mV A V mV A V mV A
5% 20 MHz Bandwidth 10% 20 MHz Bandwidth 10% 20 MHz Bandwidth
Comment
VOUT1 VRIPPLE1 IOUT1 VOUT2 VRIPPLE2 IOUT2 VOUT3 VRIPPLE3 IOUT3
3.135 0.75 8.10 0.3 21.6 0.1
3.3
9.0
24.0
POUT POUT_PEAK TAMB
7.6 80 0
21.6
40
W W % o C
Measured at Max. POUT, 25 C Free convection, Sea level
o
Page 5 of 25
Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-120
22 W Triple Output Flyback - DPA424R
October 26, 2005
3 Schematic
Figure 2 - Schematic.
Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
Page 6 of 25
DER-120
22 W Triple Output Flyback - DPA424R
October 26, 2005
4 Circuit Description
4.1 Input EMI filtering Figure 1 shows a single-ended Flyback converter using the DPA424R. The circuit is designed for an input range of 28 V to 60 V providing three isolated outputs at +3.3 V, +9 V and +24 V at 2 A, 0.6 A and 0.4 A respectively. C10 and C14 bypass the DC rail. The DC rail is applied to the primary winding of T1. The other side of the transformer primary is driven by the integrated MOSFET in U1. VR1 clamps the U1 drain leakage spikes. C1 and R3 dampen the drain-source voltage ringing. R9 is used to set the low line turn-on threshold to approximately 23 V, and also sets the overvoltage shutdown level to approximately 61 V. C4 bypasses the U1 control pin, and provides the peak current necessary for driving the DPA-Switch internal MOSFET. C5 has three functions. It provides the energy required by U1 during startup, sets the auto-restart frequency during fault conditions, and also reduces the gain of U1 as a function of frequency. R1 adds a zero to stabilize the power supply control loop. 4.2 Output Rectification The output of T1 is rectified and filtered by D3 (D7, D2) and C2 (C6, C12). L6 and C8 provide additional high frequency filtering. An auxiliary Flyback winding on T1 powers U1 during normal operation. This winding delivers energy during the off time of U1, with an output voltage proportional to the supply output voltage. The turns-ratio of T1 sets the output voltage of the auxiliary winding to approximately 12 V. D4 and C8 rectify and filter the auxiliary winding output. 4.3 Output Feedback R6 and R7 divide down the supply output voltage and apply it to the reference pin of error amplifier U3. C9 and R8 roll off the gain of U3. U3 drives the opto-coupler LED of U2 through resistor R10 to provide feedback information to the CONTROL pin of U1. The opto-coupler phototransistor output also provides power to U1 during normal operating conditions. R2 provides bias current to U3.
Page 7 of 25
Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-120
22 W Triple Output Flyback - DPA424R
October 26, 2005
5 PCB Layout
Figure 3 - Printed Circuit Layout.
Page 8 of 25
Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-120
22 W Triple Output Flyback - DPA424R
October 26, 2005
6 Bill Of Materials
6.1 Triple Output Flyback Converter
Item Qty Ref Description P/N Manufacturer
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C12 C14 D1 D2 D3 D4 D7 L6 R1 R2 R3 R5 R6 R7 R8 R9 R10 T1 U1 U2 U3
390pF/200V 100uF/10V/Polymer 4.7uF/16V 0.47uF/0805 68uF/16V 100uF/16V 1nF/1kV/1812 4.7uF/10V 1uF/0805 1uF/100V 4.7uF/10V 1uF/100V 160V TVS 1A/80V Schottky 5A/20V Schottky Small Signal Diode 1A/40V Schottky 1uH 1/0603 1k/0805 680 1/4W 10R/0805 27.4k/1%/0603 86.6k/1%/0603 220/0603 453k/0805 68/0805 Custom Flyback EFD20 PWM + MOSFET Opto-coupler Prec. Shunt Regulator
C1210C391K2GAC EEUFUD0J101RX ECST1CY475R ECST1CD686R T494D107(1)016AS 18122R102KEBB0D ECST1AY475R C4532X7R2A105M C3216X5R1A475K C4532X7R2A105M P6SMB160A/SMB B180/SMB B520/SMC SD101AW/SOD323 B140/SMB
Kemet Panasonic Panasonic Panasonic Kemet Yageo Panasonic TDK TDK TDK On Semiconductor Diodes, Inc Diodes, Inc Diodes, Inc Diodes, Inc
DPA424R PC317A LM431A/SOT23
Power Integrations Sharp National Semiconductor
Page 9 of 25
Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-120
22 W Triple Output Flyback - DPA424R
October 26, 2005
7 Transformer Specification
Figure 4 - Transformer Diagram
7.1
Electrical Specifications
Electrical Strength Creepage Primary Inductance 1 second, from Pins 1-5 to Pins 6-10 Between Pins 1-5 and Pins 6-10 Pins 1,2, all other windings open, measured at 400KHz, 400mVRMS Pins 1,2, all other windings open Pins 1,2, with Pins 6-10 shorted, measured at 400KHz, 400mVRMS 1000 VDC N/A 40 H, 10 % 5.0 MHz (Min.) 0.75 H (Max.)
Resonant Frequency Primary Leakage Inductance
7.2
Materials Item [1] [2] [3] [4] [5] [6]
Description Core: EFD20/3F3 or equivalent gap for AL of 133 nH/T2 Bobbin: 10 pin surface mount Magnet Wire: #32 AWG Double Coated Foil Tape, Polyester Varnish
Page 10 of 25
Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-120 7.3
22 W Triple Output Flyback - DPA424R
October 26, 2005
Transformer Build Diagram
Figure 5 - Transformer Cross-Section
7.4
Transformer Construction Primary Start at Pin 2. Wind 17 trifilar turns of item [3] uniformly on a single layer. Finish on pin 1. Basic Insulation Use one layer of item [5] for basic insulation. Bias Winding Start at Pin 5. Wind 6 turns of 9 strands of item [3] uniformly on a single layer. Finish on Pin 4. Insulation Use 3 layers of item [5] for basic insulation. +3.3 V Winding Prepare cuffed foil assembly. Start at Pin 10. Wind 2 turns of item [4]. Finish on pin 7 and 9. Basic Insulation Use one layer of item [5] for basic insulation. +9 V & +12 V Wind +9 V and +12 V windings simultaneously and uniformly on a single Windings layer. Start +9 V winding on pin 8 with 7 strands on item [3] and start +12 V winding on pin 6 with a quadfilar item [3] make 3 turns and finish +9V windings to pin 10. Continue +12 v windings an additional 5 turns and finish on pin 8. Outer Wrap Wrap windings with 3 layers of tape [item [5]. Final Assembly Assemble and secure core halves. Dip varnish cores (item [6]). Do not impregnate
Page 11 of 25
Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-120
22 W Triple Output Flyback - DPA424R
October 26, 2005
8 Transformer Spreadsheets
Page 12 of 25
Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-120
22 W Triple Output Flyback - DPA424R
October 26, 2005
9 Performance Data
All measurements performed at room temperature. 9.1 Cross Regulation Matrix
Input Voltage 28 +3.3V +9V +24V Input Current Input Power +3.3V +9V +24V Input Current Input Power +3.3V +9V +24V Input Current Input Power Input Voltage 48 +3.3V +9V +24V Input Current Input Power +3.3V +9V +24V Input Current Input Power +3.3V +9V +24V Input Current Input Power Input Voltage 60 +3.3V +9V +24V Input Current Input Power +3.3V +9V +24V Input Current Input Power +3.3V +9V +24V Input Current Input Power 3.4 10.13 26.27 0.018 1.08 3.36 8.93 24.01 0.219 13.14 3.35 9.46 23.72 0.396 23.76 LOAD Regulation 0 103.0% 0 112.6% 0 109.5% 0.000% 0.75 0.6 0.1 101.8% 99.2% 100.0% 78.227% 101.5% 105.1% 98.8% 80.076% 3.36 9.09 24.17 0.167 10.02 3.36 8.92 23.64 0.349 20.94 3.35 9.26 24.99 0.306 18.36 LOAD Regulation 0.75 101.8% 0.3 101.0% 0.1 100.7% 76.487% 0.75 0.6 0.4 101.8% 99.1% 98.5% 82.751% 101.5% 102.9% 104.1% 80.365% 3.37 9.02 23.7 0.3 18 3.35 9.49 25.28 0.26 15.6 3.36 9.23 24.48 0.442 26.52 LOAD Regulation 0.75 102.1% 0.3 100.2% 0.4 98.8% 81.742% 2 0.3 0.1 101.5% 105.4% 105.3% 77.404% 101.8% 102.6% 102.0% 83.145% 3.43 10.05 26.16 0.019 0.912 3.37 8.93 24.01 0.277 13.296 3.36 9.4 24.7 0.514 24.672 LOAD Regulation 0 103.9% 0 111.7% 0 109.0% 0.000% 0.75 0.6 0.1 102.1% 99.2% 100.0% 77.365% 101.8% 104.4% 102.9% 78.713% 3.38 9.11 24.18 0.215 10.32 3.37 8.82 23.45 0.452 21.696 3.36 9.32 25.16 0.397 19.056 LOAD Regulation 0.75 102.4% 0.3 101.2% 0.1 100.8% 74.477% 0.75 0.6 0.4 102.1% 98.0% 97.7% 79.275% 101.8% 103.6% 104.8% 77.813% 3.37 9.01 23.52 0.391 18.768 3.35 9.48 25.27 0.333 15.984 3.36 9.29 24.67 0.581 27.888 LOAD Regulation 0.75 102.1% 0.3 100.1% 0.4 98.0% 77.997% 2 0.3 0.1 101.5% 105.3% 105.3% 75.519% 101.8% 103.2% 102.8% 79.468% 3.39 9.35 24.32 0.018 0.504 3.35 8.94 24.14 0.466 13.048 3.35 9.66 25.44 0.929 26.012 LOAD Regulation 0 102.7% 0 103.9% 0 101.3% 0.000% 0.75 0.6 0.1 101.5% 99.3% 100.6% 78.866% 101.5% 107.3% 106.0% 76.019% 3.34 9.1 24.22 0.353 9.884 3.35 8.89 23.74 0.791 22.148 3.33 9.51 25.81 0.695 19.46 LOAD Regulation 0.75 101.2% 0.3 101.1% 0.1 100.9% 77.469% 0.75 0.6 0.4 101.5% 98.8% 98.9% 78.303% 100.9% 105.7% 107.5% 76.809% 3.35 9.06 23.83 0.667 18.676 3.33 9.7 25.89 0.571 15.988 3.34 9.48 25.36 1.067 29.876 LOAD Regulation 0.75 101.5% 0.3 100.7% 0.4 99.3% 79.045% 2 0.3 0.1 100.9% 107.8% 107.9% 76.051% 101.2% 105.3% 105.7% 75.351%
2 0.3 0.4
2 0.6 0.1
2 0.6 0.4
2 0.3 0.4
2 0.6 0.1
2 0.6 0.4
2 0.3 0.4
2 0.6 0.1
2 0.6 0.4
Page 13 of 25
Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-120 9.2 Regulation
22 W Triple Output Flyback - DPA424R
October 26, 2005
9.2.1 LINE
110.0%
107.5%
+24V
105.0%
+9V
Regulation Tolerance (%)
102.5%
100.0%
+3.3V
97.5%
95.0%
92.5%
90.0% 0 10 20 30 Input Voltage (VDC) 40 50 60 70
Figure 6 - Line Regulation, Full Load
Page 14 of 25
Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-120 9.2.2 LOAD
115.0%
22 W Triple Output Flyback - DPA424R
October 26, 2005
112.5%
110.0%
+9V
107.5% Regulation Tolerance (%)
105.0%
102.5%
100.0%
+3.3V +24V
97.5%
95.0%
92.5%
Solid Line = 28VDC Input Dotted Line = 60VDC Input
no min LOAD max
90.0%
Figure 7 - Load Regulation, 28 V and 60 VDC Input
Page 15 of 25
Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-120
22 W Triple Output Flyback - DPA424R
October 26, 2005
10 Waveforms
10.1 Drain Voltage, Normal Operation
Figure 8 - 48 VDC, No Load. Upper: IDRAIN, 1 A/div Lower: VDRAIN, 50 V/div, 0.5 s / div
Figure 9 - 48 VDC Input, Full Load. Upper: IDRAIN, 1 A/div Lower: VDRAIN, 50 V/div, 0.5 s / div
Figure 10 - 48 VDC, Minimum Load. Upper: IDRAIN, 1 A/div Lower: VDRAIN, 50 V/div, 0.5 s / div
Figure 11 - 60 VDC Input, Full Load. Upper: IDRAIN, 1 A/div Lower: VDRAIN, 50 V/div, 0.5 s / div
Page 16 of 25
Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-120
22 W Triple Output Flyback - DPA424R
October 26, 2005
10.2 Output Voltage Start-up Profile
+24V +9V +3.3V
+24V +9V +3.3V
Figure 12 - Start-up Profile, 48 VDC No Load T: 10msec/div
Figure 13 - Start-up Profile, 48 VDC Full Load T: 10msec/div
Page 17 of 25
Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-120
Triple Output Flyback - DPA424R
October 26, 2005
10.3 Load Transient Response (0.75 A to 2 A Load Step) In the figures shown below, signal averaging was used to better enable viewing the load transient response. The oscilloscope was triggered using the load current step as a trigger source. Since the output switching and line frequency occur essentially at random with respect to the load transient, contributions to the output ripple from these sources will average out, leaving the contribution only from the load step response. +9 V and +24 V Loads were set to maximum.
Figure 14 - Transient Response Top: Load Current; 1 A/div. Bottom: +3.3 V Output 100 mV, 1ms/div.
Page 18 of 25
Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-120
Triple Output Flyback - DPA424R
October 26, 2005
10.4 Output Ripple Measurements 10.4.1 Ripple Measurement Technique For DC output ripple measurements, a modified oscilloscope test probe must be utilized in order to reduce spurious signals due to pickup. Details of the probe modification are provided in Figure 15 and Figure 16. The 5125BA probe adapter is affixed with two capacitors tied in parallel across the probe tip. The capacitors include one (1) 0.1 F/50 V ceramic type and one (1) 1.0 F/50 V aluminum electrolytic. The aluminum electrolytic type capacitor is polarized, so proper polarity across DC outputs must be maintained (see below).
Probe Ground
Probe Tip
Figure 15 - Oscilloscope Probe Prepared for Ripple Measurement. (End Cap and Ground Lead Removed)
Figure 16 - Oscilloscope Probe with Probe Master 5125BA BNC Adapter. (Modified with wires for probe ground for ripple measurement, and two parallel decoupling capacitors added)
Page 19 of 25
Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-120
Triple Output Flyback - DPA424R
October 26, 2005
10.4.2 Measurement Results at 48 VDC
Figure 17 - +3.3 V Ripple, Full Load, 20mV/div; T: 2usec/div
Figure 18 - +9 V Ripple, Full Load, 50mV/div; T: 2usec/div
Figure 19 - +24 V Ripple, Full Load, 50mV/div; T: 2usec/div
38mV p-p
130mV p-p
160mV p-p
Page 20 of 25
Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-120
Triple Output Flyback - DPA424R
October 26, 2005
11 Control Loop Measurements
11.1 Maximum Load
Figure 20 - Gain-Phase Plot, 28VDC Input Maximum Steady State Load Vertical Scale: Gain = 8 dB/div, Phase = 40 /div. Crossover Frequency = 4.55 kHz Phase Margin = 49.4
Figure 21 - Gain-Phase Plot, 48VDC Input Maximum Steady State Load Vertical Scale: Gain = 8 dB/div, Phase = 40 /div. Crossover Frequency = 2.23 kHz Phase Margin = 63.7
Page 21 of 25
Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-120
Triple Output Flyback - DPA424R
October 26, 2005
Figure 22 - Gain-Phase Plot, 60 VDC Input Maximum Steady State Load Vertical Scale: Gain = 8 dB/div, Phase = 40 /div. Crossover Frequency = 2.27 kHz Phase Margin = 76.7
11.2 Minimum Load
Figure 23 - Gain-Phase Plot, 28 VDC Input Minimum Load Vertical Scale: Gain = 8 dB/div, Phase = 40 /div. Crossover Frequency = 4.97 kHz Phase Margin = 74.8
Page 22 of 25
Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-120
Triple Output Flyback - DPA424R
October 26, 2005
Figure 24 - Gain-Phase Plot, 48 VDC Input Minimum Load Vertical Scale: Gain = 8 dB/div, Phase = 40 /div. Crossover Frequency = 1.28 kHz Phase Margin = 76.1
Figure 25 - Gain-Phase Plot, 60 VDC Input Minimum Load Vertical Scale: Gain = 8 dB/div, Phase = 40 /div. Crossover Frequency = 896Hz Phase Margin = 53.98
Page 23 of 25
Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-120
Triple Output Flyback - DPA424R
October 26, 2005
12 Revision History
Date 10-26-05 Author RSP Revision 1.0 Description & changes Initial release Reviewed VC, JC, KM
Page 24 of 25
Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-120
Triple Output Flyback - DPA424R
October 26, 2005
For the latest updates, visit our website: www.powerint.com
Power Integrations reserves the right to make changes to its products at any time to improve reliability or manufacturability. Power Integrations does not assume any liability arising from the use of any device or circuit described herein. POWER INTEGRATIONS MAKES NO WARRANTY HEREIN AND SPECIFICALLY DISCLAIMS ALL WARRANTIES INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. PATENT INFORMATION The products and applications illustrated herein (including transformer construction and circuits external to the products) may be covered by one or more U.S. and foreign patents, or potentially by pending U.S. and foreign patent applications assigned to Power Integrations. A complete list of Power Integrations' patents may be found at www.powerint.com. Power Integrations grants its customers a license under certain patent rights as set forth at http://www.powerint.com/ip.htm. The PI Logo, TOPSwitch, TinySwitch, LinkSwitch, DPA-Switch, EcoSmart, PI Expert and PI FACTS are trademarks of Power Integrations, Inc. Other trademarks are property of their respective companies. (c)Copyright 2005 Power Integrations, Inc.
Power Integrations Worldwide Sales Support Locations
WORLD HEADQUARTERS 5245 Hellyer Avenue San Jose, CA 95138, USA. Main: +1-408-414-9200 Customer Service: Phone: +1-408-414-9665 Fax: +1-408-414-9765 e-mail: usasales@powerint.com GERMANY Rueckertstrasse 3 D-80336, Munich Germany Phone: +49-89-5527-3910 Fax: +49-89-5527-3920 e-mail: eurosales@powerint.com JAPAN Keihin Tatemono 1st Bldg 2-12-20 Shin-Yokohama, Kohoku-ku, Yokohama-shi, Kanagawa ken, Japan 222-0033 Phone: +81-45-471-1021 Fax: +81-45-471-3717 e-mail: japansales@powerint.com KOREA RM 602, 6FL Korea City Air Terminal B/D, 159-6 Samsung-Dong, Kangnam-Gu, Seoul, 135-728, Korea Phone: +82-2-2016-6610 Fax: +82-2-2016-6630 e-mail: koreasales@powerint.com SINGAPORE 51 Newton Road, #15-08/10 Goldhill Plaza, Singapore, 308900 Phone: +65-6358-2160 Fax: +65-6358-2015 e-mail: singaporesales@powerint.com TAIWAN 5F, No. 318, Nei Hu Rd., Sec. 1 Nei Hu Dist. Taipei, Taiwan 114, R.O.C. Phone: +886-2-2659-4570 Fax: +886-2-2659-4550 e-mail: taiwansales@powerint.com
CHINA (SHANGHAI) Rm 807-808A, Pacheer Commercial Centre, 555 Nanjing Rd. West Shanghai, P.R.C. 200041 Phone: +86-21-6215-5548 Fax: +86-21-6215-2468 e-mail: chinasales@powerint.com
INDIA 261/A, Ground Floor 7th Main, 17th Cross, Sadashivanagar Bangalore, India 560080 Phone: +91-80-5113-8020 Fax: +91-80-5113-8023 e-mail: indiasales@powerint.com
EUROPE HQ 1st Floor, St. James's House East Street, Farnham Surrey, GU9 7TJ United Kingdom Phone: +44 (0) 1252-730-140 Fax: +44 (0) 1252-727-689 e-mail: eurosales@powerint.com
CHINA (SHENZHEN) Room 2206-2207, Block A, Elec. Sci. Tech. Bldg. 2070 Shennan Zhong Rd. Shenzhen, Guangdong, China, 518031 Phone: +86-755-8379-3243 Fax: +86-755-8379-5828 e-mail: chinasales@powerint.com
ITALY Via Vittorio Veneto 12 20091 Bresso MI Italy Phone: +39-028-928-6000 Fax: +39-028-928-6009 e-mail: eurosales@powerint.com
APPLICATIONS HOTLINE World Wide +1-408-414-9660 APPLICATIONS FAX World Wide +1-408-414-9760
Page 25 of 25
Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com

▲Up To Search▲

Price & Availability of DER-120

	To Download DER-120 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .