 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| www.fairchildsemi.com KA7577 SMPS Controller Features * * * * * * * Low Stand-By Current Pulse by Pulse Current Limiting Over Voltage Protection Over Current Protection Integrated Thermal Shutdown Circuit Output Driver Current of 2A Totem pole Output Description KA7577 is fixed frequency PWM controller and specially designed for SMPS to get regulated DC voltage from AC power supply. This integrated circuit has so fast rise and fall output pulse that it can directly drive power transistor as well as power MOSFET. This device features high speed and high sensitive current limiting. Protection circuitry include current limiting function against short and over current at secondary side, owing to the integrated timertype-protection circuit. 16-DIP 1 20-SOP 1 Internal Block Diagram Rev. 5.0 (c)2000 Fairchild Semiconductor International KA7577 Absolute Maximum Ratings Parameter Supply Voltage Collector Supply Voltage Output DC Current Output Peak Voltage VF Terminal Voltage VON/OFF Terminal Voltage Current Limiting (-) Terminal Voltage Current Limiting (+) Terminal Voltage Over Voltage Protection Terminal Voltage Detection Terminal Voltage (Note 1) Detection Terminal Sink Current (Note 1) Feedback Terminal Voltage Timer ON Terminal Source Current Timer OFF Terminal Source Current Power Dissipation hermal Derating Factor Operating Temperature Range Storage Temperature Range Junction Temperature Symbol VCC VC IO(DC) IOPK V(VF) V(ON/OFF) V(CLM - ) V(CLM +) V(OVP) V(DET) ISINK(DET) V(FB) ISOURCE(T-ON) ISOURCE(T-OFF) PD KTD TOPR TSTG TJ Value 31 31 0.5 2 31 31 - 4 ~+4 - 0.3 ~+4 31 6 5 0 - 10 -1 -1 1.5 12 - 25 ~ +85 - 40 ~ +125 150 Unit V V A A V V V V V V mA V mA mA W mW/C C C C Note: 1. This terminal has the constant voltage characteristics of 6-8V, when current is supplied from out side. The maximum allowable voltage is 6V when the constant voltage is applied to this terminal. And maximum allowable current is 5mA, it is recommended to use current limiting resistor. 2 KA7577 Electrical Characteristics (VCC = 18V, TA = 25C, unless otherwise specified) Parameter Power Supply Voltage Operation Start-Up Voltage Operation Stop Voltage Difference Voltage Between Operation Start and Stop Stand-By Current Operating Supply Current Supply Current at Non-Operating Supply Current at Timer NonOperating Supply Current at OVP Operating ON/OFF SECTION ON/OFF Terminal High Threshold Voltage VTHH(ON/OFF) 2.1 1.9 0.1 2.6 2.4 0.2 3.1 2.9 0.3 V V V Symbol VCC VCC(START) VCC(STOP) VCC ISB ICC(OPR) ICC(OFF) ICC(CT) ICC(OVP) Conditions TA = 25C, VCC = 14.5V TA = -30 to +85C, VCC = 14.5V VCC = 30V VCC = 25V VCC = 14V VCC = 25V VCC = 14V VCC = 25V VCC = 9.5V Min. 15.2 9.0 5.0 50 40 13 0.95 50 0.95 1.0 125 Typ. Max. Unit 16.2 9.9 6.3 80 80 15 1.31 80 1.35 140 2.0 190 30 17.2 10.9 7.6 140 160 21 1.9 120 2.0 220 3.0 290 V V V V A A mA mA A mA A mA A POWER SUPPLY VOLTAGE AND CURRENT SECTION ON/OFF Terminal Low Threshold VTHL(ON/OFF) Voltage ON/OFF Terminal Hysteresis Voltage DETECTION SECTION Detection Voltage Input Current of Detection Voltage Voltage Gain of Detection Amp FEEDBACK SECTION Current at Min Duty Cycle Current at Max Duty Cycle Current Difference Between Max and Zero Duty Cycle FB Terminal Voltage FB Terminal Resistance IFB(MIND) IFB(MAXD) I (FB) V(FB) R(FB) V(DET) II(DET) GV(DET) V(DET) = 2.5V VHYS(ON/OFF) - 2.4 - 2.5 1.0 55 2.6 3.0 - V A dB - 40 ISINK = - 0.95mA V(DET) = 2.5V - 2.1 -1.54 -1.0 mA mA mA V W - 0.9 - 0.55 - 0.4 -1.35 - 0.99 - 0.7 4.9 5.9 500 7.1 - 3 KA7577 Electrical Characteristics (VCC=18V, TA=25C, unless otherwise specified) Parameter OVP Terminal Threshold Voltage OVP Terminal Input Current OVP Cancellation Voltage Difference Voltage Between Operating Stop and OVP Cancellation TIMER SECTION Timer Frequency Timer Charge Current Off Time/On Time Ratio CURRENT LINITTING SECTION CLM( - ) Terminal Threshold Voltage CLM( - ) Terminal Source Current CLM( - ) Terminal Duty Time CLM(+ ) Terminal Threshold Voltage CLM(+ ) Terminal Source Current CLM(+ ) Terminal Duty Time OSCILLATOR SECTION Operation Frequency Maximum On Duty Upper Limit Voltage of Oscillation Waveform Lower Limit Voltage of Oscillation Waveform Voltage Difference Between Upper Limit and Lower Limit VF SECTION VVF = 5V, RT-ON = 17K RT-OFF = 20K CF = 220pF VF = 2V, RT-ON = 17V RT-OFF = 20K CF = 220pF 170 188 207 KHz f DON(MAX) VL(OSC) VL(OSC) V(OSC) RT-ON = 17K RT-OFF = 20K CF = 220pF TA = - 5 to + 85C TA = - 5 to + 85C 170 47 3.97 1.76 2.11 188 50 4.37 1.96 2.41 208 53 4.77 2.16 2.71 KHz % V V V VTH(CLM - ) ISOURCE(CLM - ) tD(CLM - ) VTH(CLM +) ISOURCE(CLM +) tD(CLM +) TA = - 5 to + 85C V(CLM +) = 0V 180 -270 TA = - 5 to + 85C V(CLM - ) -220 -170 -200 -125 170 200 -205 220 -140 130 -180 -90 mV A nS mV A nS f(TIMER) ICHG(TIMER) K TA = -5C TA = 25C TA = 85C 0.27 -193 -178 -147 7.0 0.4 -138 -127 -105 8.7 0.6 -102 -94 -78 11.0 Hz A Symbol VTH(OVP) II(OVP) VCC(OVPC) VCC(OVP) Conditions Min. 1.0 7.6 0.65 Typ. 1.4 1.2 8.6 1.3 Max. 1.8 3.6 Unit V A V V OVER VOLTAGE PROTECTION SECTION OSC. Frequency at CLM Operating fVF 108 124 143 KHz 4 KA7577 Electrical Characteristics (VCC=18V, TA = 25C , unless otherwise specified) Parameter VF SECTION Duty Ratio of CLM Operating VF Voltage at Timer Operating Start VF Terminal Input Current OUTPUT SECTION VOL1 Low Output Voltage VOL2 VOL3 VOL4 High Output Voltage Rise Time Fall Time THERMAL PROTECTION SECTION Thermal protection Operating Temperature T(TP) 120 140 160 C VOH1 VOH2 TR TF VCC = 18V, IO = 10mA VCC = 18V, IO = 100mA VCC = 5V, IO = 1mA VCC = 5V, IO = 100mA VCC = 18V, IO = -10mA VCC = 18V, IO = -100mA No load No load 16.0 15.5 0.05 0.7 0.69 1.3 16.5 16.0 50 35 0.4 1.4 1.0 2.0 V V V V V V ns ns K V(VF) I(VF) VF = 0.2V Max On Duty/ Min Off Duty 11 2.7 13.7 3.0 2 22 3.3 6 V A Symbol Conditions Min. Typ. Max. Unit 5 KA7577 Mechanical Dimensions Package Dimensions in millimeters 16-DIP ( #1 #16 0.81 ) 0.032 6.40 0.20 0.252 0.008 19.80 MAX 0.780 19.40 0.20 0.764 0.008 #8 #9 7.62 0.300 3.25 0.20 0.128 0.008 0.38 0.014 MIN 5.08 MAX 0.200 3.30 0.30 0.130 0.012 0~15 0.25 -0.05 0.010 -0.002 +0.004 +0.10 6 2.54 0.100 0.46 0.10 0.018 0.004 1.50 0.10 0.059 0.004 KA7577 Mechanical Dimensions (Continued) Package Dimensions in millimeters 20-SOP MIN 1.14 ) 0.045 MAX0.10 MAX0.004 1.27 0.050 +0.10 0.40 -0.05 +0.004 0.016 -0.002 ( 0.05 0.002 1.70 0.10 0.067 0.004 #1 #20 14.10 MAX 0.555 #10 #11 7.80 0.30 0.307 0.012 +0.10 0.20 -0.05 +0.004 0.008 -0.002 2.00 MAX 0.079 5.40 0.20 0.213 0.008 7.62 0.300 0.60 0.20 0.024 0.008 0~ 8 13.70 0.20 0.539 0.008 7 KA7577 Ordering Information Product Number KA7577 KA7577D Package 16-DIP 20-SOP Operating Temperature -25 ~ +85C -25 ~ +85C 8 KA7577 9 KA7577 DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR INTERNATIONAL. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. www.fairchildsemi.com 9/25/00 0.0m 001 Stock#DSxxxxxxxx 2000 Fairchild Semiconductor International 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. |
Price & Availability of KA7577
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |