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FEATURES
High efficiency: 88.5% @ 3.3V/8A Size: 47.20mmx29.5mmx8.15mm (1.86"x1.16"x0.32") Wide input voltage range: 18V~60V Standard footprint Surface mountable Industry standard pin out Fixed frequency operation Input UVLO, OVLO, Output OCP, OVP, OTP No minimum load required ISO 9001, TL 9000, ISO 14001, QS9000, OHSAS18001 certified manufacturing facility UL/cUL 60950 (US & Canada) recognized, and TUV (EN60950) certified CE mark meets 73/23/EEC and 93/68/EEC directive
Delphi Series S36SA, 25W Family
DC/DC Power Modules: 18Vin to 60Vin, 3.3V/8A out
The Delphi Series S36SA, surface mountable, single output, isolated DC/DC converter, is the latest offering from a world leader in power systems technology and manufacturing - Delta Electronics, Inc. This product family provides up to 25 watts of power or up to 8A of output current in an industry standard footprint. With creative design technology and optimization of component placement, the Delphi Series Small Power converters possess outstanding electrical and thermal performance, as well as extremely high reliability under highly stressful operating conditions. All models are protected from abnormal input/output voltage and current conditions.
OPTIONS
Positive On/Off logic
APPLICATIONS
Telecom/DataCom Wireless Networks Optical Network Equipment Server and Data Storage Industrial/Test Equipment
DATASHEET DS_S36SA3R308_04062006 Delta Electronics, Inc.
TECHNICAL SPECIFICATIONS
(TA=25C, airflow rate=300 LFM, Vin=48Vdc, nominal Vout unless otherwise noted.)
PARAMETER
ABSOLUTE MAXIMUM RATINGS Input Voltage Continuous Transient (100ms) Operating Temperature Storage Temperature Input/Output Isolation Voltage INPUT CHARACTERISTICS Operating Input Voltage Input Under-Voltage Lockout Turn-On Voltage Threshold Turn-Off Voltage Threshold Lockout Hysteresis Voltage Maximum Input Current No-Load Input Current Off Converter Input Current Inrush Current(I2t) Input Reflected-Ripple Current Input Voltage Ripple Rejection OUTPUT CHARACTERISTICS Output Voltage Set Point Output Voltage Regulation Over Load Over Line Over Temperature Total Output Voltage Range Output Voltage Ripple and Noise Peak-to-Peak RMS Operating Output Current Range Output DC Current-Limit Inception DYNAMIC CHARACTERISTICS Output Voltage Current Transient Positive Step Change in Output Current Negative Step Change in Output Current Settling Time (within 1% Vout nominal) Turn-On Transient Start-Up Time, From On/Off Control Start-Up Time, From Input Maximum Output Capacitance EFFICIENCY 100% Load 100% Load ISOLATION CHARACTERISTICS Input to Output Isolation Resistance Isolation Capacitance FEATURE CHARACTERISTICS Switching Frequency ON/OFF Control, (Logic Low-Module ON) Logic Low Logic High ON/OFF Current Leakage Current Output Voltage Trim Range Output Voltage Remote Sense Range Output Over-Voltage Protection GENERAL SPECIFICATIONS MTBF Weight Over-Temperature Shutdown
NOTES and CONDITIONS
Min.
S36SA3R308NRFA
Typ. Max. Units 65 100 100 125 Vdc Vdc C C Vdc Vdc Vdc Vdc Vdc A mA mA A2s mA dB Vdc mV mV mV mV mV mV A %
100ms Refer to Figure 13 for measuring point 1 minute
-40 -55 1500 18 16 15 0.7 17 16 1.5 45 4 0.003 15 50 3.25 3.30 3 3 15 3.16 50 10 0 110
60 18 17 2 2.1 100 10 1
100% Load, 18Vin
P-P thru 12H inductor, 5Hz to 20MHz 120 Hz Vin=48V, Io=Io.max, Tc=25C Io=Io,min to Io,max Vin=18V to60V Tp=-40C to 100C over sample load, line and temperature 5Hz to 20MHz bandwidth Full Load, 1F ceramic, 10F tantalum Full Load, 1F ceramic, 10F tantalum Output Voltage 10% Low 48V, 10F Tan & 1F Ceramic load cap, 1A/s 50% Io,max to 100% Io,max 100 % Io,max to 50% Io,max
3.35 12 10 3.44 100 30 8 150
80 80 200 6 7
200 200
mV mV us ms ms F % % Vdc M PF kHz
Full load; 5% overshoot of Vout at startup Vin=48V Vin=24V 86.5 87.5 1500 100 1500 350 Von/off at Ion/off=1.0mA Von/off at Ion/off=0.0 A Ion/off at Von/off=0.0V Logic High, Von/off=15V Across Pins 9 & 5, Pout max rated power Pout max rated power Over full temp range; % of nominal Vout Io=80% of Io, max; Tc=40C Refer to Figure 13 for measuring point 88.5 89.5
15 15 3000
2
-10 115 122 5.8 16.9 105
0.7 18 1 50 10 10 135
V V mA uA % % % Mhour grams C
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ELECTRICAL CHARACTERISTICS CURVES
4.5
90
4.0 3.5 3.0 2.5 2.0
18Vin
24Vin
80
EFFICIENCY (%)
70
18Vin
60
24Vin 48Vin 60Vin
POWER DISSIPATION (W)
1.5 1.0
48Vin
60Vin
50 1 2 3 4 5 6 7 8
OUTPUT CURRENT (A)
1
2
3
4
5
6
7
8
OUTPUT CURRENT (A)
Figure 1: Efficiency vs. load current for minimum, nominal, and maximum input voltage at 25C.
2.2 2 1.8 1.6
Figure 2: Power dissipation vs. load current for minimum, nominal, and maximum input voltage at 25C.
Io=8A Io=4.8A Io=0.8A
input current (A)
1.4 1.2 1 0.8 0.6 0.4 0.2 0 10 15 20 25 30 35 40 45 50 55 60
input voltage (V)
Figure 3: Typical input characteristics at 25C.
Figure 4: Turn-on transient at full load current (Constant resistance mode) (1 ms/div). Vin: 48V; Top Trace: Vout (1V/div); Bottom Trace: ON/OFF Control (5V/div).
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ELECTRICAL CHARACTERISTICS CURVES
Figure5: Turn-on transient at zero load current (Constant resistance mode) (1 ms/div). Vin: 48V; Top Trace: Vout (1V/div); Bottom Trace: ON/OFF Control (5V/div).
Figure 6: Output voltage response to step-change in load current (50%-100% of Io, max; di/dt = 1A/s). Load cap: 10F, 100 m ESR tantalum capacitor and 1F ceramic capacitor. Top Trace: Vout (50mV/div, 100 us/div), Bottom Trace: Iout (2.42A/div).
is
TEST 12uH Cs:68uF/100V ESR< 0.3 100KHz 20 68uF/100V ESR< 0.3 100KHz 20
Vi(+)
Vi(-)
Figure 7: Output voltage response to step-change in load current (100%-50% of Io, max; di/dt = 1A/s). Load cap: 10F, 100 mESR tantalum capacitor and 1F ceramic capacitor. Top Trace: Vout (50mV/div, 100 us/div), Bottom Trace: Iout (2.42A/div).
Figure 8: Test set-up diagram showing measurement points for Input Reflected Ripple Current (Figure 9). Note: Measured input reflected-ripple current with a simulated source Inductance (LTEST) of 12 H. Capacitor Cs offset possible battery impedance.
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ELECTRICAL CHARACTERISTICS CURVES
Copper Strip Vo(+)
10u Vo(-)
1u
SCOPE
RESISTIVE LOAD
Figure 9: Input reflected ripple current, is, at full rated output current and nominal input voltage with 12H source impedance and 68F electrolytic capacitor (20 mA/div).
Figure 10: Output voltage noise and ripple measurement test setup. Scope measurement should be made using a BNC cable (length shorter than 20 inches). Position the load between 51 mm to 76 mm (2 inches to 3 inches) from the module.
3.5
3
2.5 OUTPUT VOLTAGE (V)
2
1.5
1
0.5 48V 0 0 2 4 6 LOAD CURRENT (A) 8 10 12
Figure 11: Output voltage ripple at nominal input voltage and rated load current (20 mV/div). Load capacitance: 1F ceramic capacitor and 10F tantalum capacitor. Bandwidth: 20 MHz.
Figure 12: Output voltage vs. load current showing typical current limit curves and converter shutdown points.
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THERMAL DERATING CURVE
Hot spot
9 Output Current(A) 8
S36SA3R308NR A Output Load vs. Ambient Temperature and Air Velocity (De-rating Curve, Either Orientation, no heatsink)
600LFM 500LFM
7
6
Natural Convection
400LFM
5
100LFM
4
150LFM
3
200LFM
2
300LFM
1
0 55 60 65 70 75 80 85 90 95 Ambient Temperature ()
Figure 13: Hot spot location
Figure 14: Output current vs. ambient temperature and air velocity (Either Orientation)
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DESIGN CONSIDERATION
Input Source Impedance
The impedance of the input source connecting to the DC/DC power modules will interact with the modules and affect the stability. A low ac-impedance input source is recommended. If the source inductance is more than a few H, we advise adding a 10 to 100 F electrolytic capacitor (ESR < 0.7 at 100 kHz) mounted close to the input of the module to improve the stability. This power module is not internally fused. To achieve optimum safety and system protection, an input line fuse is highly recommended. The safety agencies require a normal-blow fuse with 5A maximum rating to be installed in the ungrounded lead. A lower rated fuse can be used based on the maximum inrush transient energy and maximum input current.
Soldering and Cleaning Considerations
Post solder cleaning is usually the final board assembly process before the board or system undergoes electrical testing. Inadequate cleaning and/or drying may lower the reliability of a power module and severely affect the finished circuit board assembly test. Adequate cleaning and/or drying is especially important for un-encapsulated and/or open frame type power modules. For assistance on appropriate soldering and cleaning procedures, please contact Delta's technical support team.
Layout and EMC Considerations
Delta's DC/DC power modules are designed to operate in a wide variety of systems and applications. For design assistance with EMC compliance and related PWB layout issues, please contact Delta's technical support team. An external input filter module is available for easier EMC compliance design. Application notes to assist designers in addressing these issues are pending release.
Safety Considerations
The power module must be installed in compliance with the spacing and separation requirements of the enduser's safety agency standard if the system in which the power module is to be used must meet safety agency requirements. When the input source is 60Vdc or below, the power module meets SELV (safety extra-low voltage) requirements. If the input source is a hazardous voltage which is greater than 60 Vdc and less than or equal to 75 Vdc, for the module's output to meet SELV requirements, all of the following must be met: The input source must be insulated from any hazardous voltages, including the ac mains, with reinforced insulation. One Vi pin and one Vo pin are grounded, or all the input and output pins are kept floating. The input terminals of the module are not operator accessible. A SELV reliability test is conducted on the system where the module is used to ensure that under a single fault, hazardous voltage does not appear at the module's output. Do not ground one of the input pins without grounding one of the output pins. This connection may allow a nonSELV voltage to appear between the output pin and ground.
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FEATURES DESCRIPTIONS
Over-Current Protection
The modules include an internal output over-current protection circuit, which will endure current limiting for an unlimited duration during output overload. If the output current exceeds the OCP set point, the modules will automatically shut down (hiccup mode). The modules will try to restart after shutdown. If the overload condition still exists, the module will shut down again. This restart trial will continue until the overload condition is corrected.
If the external resistor is connected between the TRIM and Vo- pins, the output voltage set point decreases. The external resistor value required to obtain a percentage of output voltage change Vo% is defined as:
Rtrim - down = 511 - 6.11[ ] %
Ex. When trim-down -10% (3.3V X 0.9 = 2.97V)
Rtrim - down = 511 - 6.11 = 44.99[ ] 10
Over-Voltage Protection
The modules include an internal output over-voltage protection circuit, which monitors the voltage on the output terminals. If this voltage exceeds the overvoltage set point, the module will shut down (Hiccup mode). The modules will try to restart after shutdown. If the fault condition still exists, the module will shut down again. This restart trial will continue until the fault condition is corrected.
Figure 16: Circuit configuration for trim-up (increase output voltage)
Over-Temperature Protection
The over-temperature protection consists of circuitry that provides protection from thermal damage. If the temperature exceeds the over-temperature threshold the module will shut down. The module will try to restart after shutdown. If the overtemperature condition still exists during restart, the module will shut down again. This restart trial will continue until the temperature is within specification. If the external resistor is connected between the TRIM and Vo the output voltage set point increases. The external resistor value required to obtain a percentage output voltage change Vo% is defined as:
Rtrim - up = 5.11 * Vo * ( 100 + %) 511 - - 6.11[ ] 1.225 * % %
Ex. When trim-up +10% (3.3V X 1.1 = 3.63V)
Rtrim - up = 5.11* 3.3 * ( 100 + 10 ) 511 - - 6.11 = 94.21[ ] 1.225 * 10 10
Output Voltage Adjustment (TRIM)
To increase or decrease the output voltage set point, the modules may be connected with an external resistor between the TRIM pin and either the Vo+ or Vo -. The TRIM pin should be left open if this feature is not used.
Care should be taken to ensure that the maximum output power of the module remains at or below the maximum rated power.
Figure 15: Circuit configuration for trim-down (decrease output voltage) 9
FEATURES DESCRIPTIONS (CONTINUED)
Remote ON/OFF
The remote on/off feature on the module can be either negative or positive logic. Negative logic turns the module on during a logic low and off during a logic high. Positive logic turns the modules on during a logic high and off during a logic low. Remote on/off can be controlled by an external switch between the on/off terminal and the Vi(-) terminal. The switch can be an open collector or open drain. If the remote on/off feature is not used, please short the on/off pin to Vi(-) for negative logic and let the pin open for positive logic.
THERMAL CONSIDERATIONS
Thermal management is an important part of the system design. To ensure proper, reliable operation, sufficient cooling of the power module is needed over the entire temperature range of the module. Convection cooling is usually the dominant mode of heat transfer. Hence, the choice of equipment to characterize the thermal performance of the power module is a wind tunnel.
Thermal Testing Setup
Delta's DC/DC power modules are characterized in heated vertical wind tunnels that simulate the thermal environments encountered in most electronics equipment. This type of equipment commonly uses vertically mounted circuit cards in cabinet racks in which the power modules are mounted. The following figure shows the wind tunnel characterization setup. The power module is mounted on a test PWB and is vertically positioned within the wind tunnel. The space between the neighboring PWB and the top of the power module or a heat sink is 6.35mm (0.25").
Vi(+)
Vo(+)
ON/OFF Trim
Vi(-)
Vo(-)
Figure 17: Circuit configuration for remote ON/OFF
Thermal Derating
Heat can be removed by increasing airflow over the module. Figure 13 and 14 show maximum output is a function of ambient temperature and airflow rate. The module's highest hot spot temperature is +120C. To enhance system reliability, the power module should always be operated below the maximum operating temperature. If the temperature exceeds the maximum module temperature, reliability of the unit may be affected.
FACING PWB PWB MODULE
AIR VELOCITY AND AMBIENT TEMPERATURE MEASURED BELOW THE MODULE
AIR FLOW
50.8 (2.0")
10 (0.4") Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
Figure 18: Wind tunnel test setup
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MECHANICAL DRAWING
Pin No. 1 2 3 6 7 8 10 11 12
Name +Vout -Vout NC Trim NC ON/OFF NC -Vin +Vin
Function Positive output voltage Negative output voltage No Connection Output voltage trim No Connection ON/OFF Logic No Connection Negative input voltage Positive input voltage
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PART NUMBERING SYSTEM
S Form Factor
S- Small Power
36 S Input Number of Voltage Outputs
18~60V S- Single
A Product Series
A- Advanced
3R3 Output Voltage
3R3- 3.3V
08 Output Current
08- 8.0A
N ON/OFF Logic
N- Negative P- Positive
R Pin Type
R- SMD
F
A Option Code
Space-RoHS 5/6 A- Standard F- RoHS 6/6 (Lead Free)
MODEL LIST
MODEL NAME
S36SA3R308NRFA
INPUT
18V~60V 2.1A 3.3V
OUTPUT
8.0A
EFF @ 100% LOAD
88.5%
CONTACT: www.delta.com.tw/dcdc
USA: Telephone: East Coast: (888) 335 8201 West Coast: (888) 335 8208 Fax: (978) 656 3964 Email: DCDC@delta-corp.com Europe: Phone: +41 31 998 53 11 Fax: +41 31 998 53 53 Email: DCDC@delta-es.com Asia & the rest of world: Telephone: +886 3 4526107 ext 6220 Fax: +886 3 4513485 Email: DCDC@delta.com.tw
WARRANTY
Delta offers a two (2) year limited warranty. Complete warranty information is listed on our web site or is available upon request from Delta. Information furnished by Delta is believed to be accurate and reliable. However, no responsibility is assumed by Delta for its use, nor for any infringements of patents or other rights of third parties, which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Delta. Delta reserves the right to revise these specifications at any time, without notice.
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