www.fairchildsemi.com KA7577 SMPS Controller Features 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. 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 16-DIP 1 20-SOP 1 Internal Block Diagram Rev. 5.0 ©2000 Fairchild Semiconductor International KA7577 Absolute Maximum Ratings Parameter Supply Voltage Collector Supply Voltage Symbol Value Unit VCC 31 V VC 31 V IO(DC) ± 0.5 A Output Peak Voltage IOPK ±2 A VF Terminal Voltage V(VF) 31 V V(ON/OFF) 31 V Current Limiting (-) Terminal Voltage V(CLM - ) - 4 ~+4 V Current Limiting (+) Terminal Voltage Output DC Current VON/OFF Terminal Voltage V(CLM +) - 0.3 ~+4 V Over Voltage Protection Terminal Voltage V(OVP) 31 V Detection Terminal Voltage (Note 1) V(DET) 6 V ISINK(DET) 5 mA V(FB) 0 - 10 V Timer ON Terminal Source Current ISOURCE(T-ON) -1 mA Timer OFF Terminal Source Current ISOURCE(T-OFF) -1 mA Power Dissipation PD 1.5 W hermal Derating Factor KTD 12 mW/°C Operating Temperature Range TOPR - 25 ~ +85 °C Storage Temperature Range TSTG - 40 ~ +125 °C TJ 150 °C Detection Terminal Sink Current (Note 1) Feedback Terminal Voltage Junction Temperature 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 = 25°C, unless otherwise specified) Parameter Symbol Conditions Min. Typ. Max. Unit VCC - - - 30 V Operation Start-Up Voltage VCC(START) - 15.2 16.2 17.2 V Operation Stop Voltage VCC(STOP) - 9.0 9.9 10.9 V ∆VCC - 5.0 6.3 7.6 V TA = 25°C, VCC = 14.5V 50 80 140 µA TA = -30 to +85°C, VCC = 14.5V 40 80 160 µA POWER SUPPLY VOLTAGE AND CURRENT SECTION Power Supply 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 ISB ICC(OPR) ICC(OFF) ICC(CT) ICC(OVP) VCC = 30V 13 15 21 mA VCC = 25V 0.95 1.31 1.9 mA VCC = 14V 50 80 120 µA VCC = 25V 0.95 1.35 2.0 mA VCC = 14V - 140 220 µA VCC = 25V 1.0 2.0 3.0 mA VCC = 9.5V 125 190 290 µA ON/OFF SECTION ON/OFF Terminal High Threshold Voltage VTHH(ON/OFF) - 2.1 2.6 3.1 V ON/OFF Terminal Low Threshold VTHL(ON/OFF) Voltage - 1.9 2.4 2.9 V ON/OFF Terminal Hysteresis Voltage VHYS(ON/OFF) - 0.1 0.2 0.3 V Detection Voltage V(DET) - 2.4 2.5 2.6 V Input Current of Detection Voltage II(DET) - 1.0 3.0 µA 40 55 - dB DETECTION SECTION Voltage Gain of Detection Amp V(DET) = 2.5V GV(DET) - FEEDBACK SECTION Current at Min Duty Cycle IFB(MIND) Current at Max Duty Cycle - - 2.1 -1.54 -1.0 mA IFB(MAXD) - - 0.9 - 0.55 - 0.4 mA Current Difference Between Max and Zero Duty Cycle ∆I (FB) - -1.35 - 0.99 - 0.7 mA FB Terminal Voltage V(FB) ISINK = - 0.95mA FB Terminal Resistance R(FB) V(DET) = 2.5V 4.9 5.9 7.1 V - 500 - W 3 KA7577 Electrical Characteristics (VCC=18V, TA=25°C, unless otherwise specified) Parameter Symbol Conditions Min. Typ. Max. Unit VTH(OVP) - 1.0 1.4 1.8 V II(OVP) - - 1.2 3.6 µA OVP Cancellation Voltage VCC(OVPC) - 7.6 8.6 - V Difference Voltage Between Operating Stop and OVP Cancellation ∆VCC(OVP) - 0.65 1.3 - V f(TIMER) - 0.27 0.4 0.6 Hz -193 -178 -147 -138 -127 -105 -102 -94 -78 µA 7.0 8.7 11.0 - TA = - 5 to + 85°C -220 -200 -180 mV V(CLM - ) -170 -125 -90 OVER VOLTAGE PROTECTION SECTION OVP Terminal Threshold Voltage OVP Terminal Input Current TIMER SECTION Timer Frequency Timer Charge Current Off Time/On Time Ratio ICHG(TIMER) TA = -5°C TA = 25°C TA = 85°C K - 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 VTH(CLM - ) ISOURCE(CLM - ) tD(CLM - ) 170 µA nS TA = - 5 to + 85°C 180 200 220 mV V(CLM +) = 0V -270 -205 -140 µA - - 130 nS f RT-ON = 17K RT-OFF = 20K CF = 220pF TA = - 5 to + 85°C 170 188 208 KHz DON(MAX) TA = - 5 to + 85°C 47 50 53 % VTH(CLM +) ISOURCE(CLM +) tD(CLM +) - OSCILLATOR SECTION Operation Frequency Maximum On Duty Upper Limit Voltage of Oscillation Waveform VL(OSC) - 3.97 4.37 4.77 V Lower Limit Voltage of Oscillation Waveform VL(OSC) - 1.76 1.96 2.16 V Voltage Difference Between Upper Limit and Lower Limit ∆V(OSC) - 2.11 2.41 2.71 V VVF = 5V, RT-ON = 17K RT-OFF = 20K CF = 220pF 170 188 207 KHz VF = 2V, RT-ON = 17V RT-OFF = 20K CF = 220pF 108 124 143 KHz VF SECTION OSC. Frequency at CLM Operating 4 fVF KA7577 Electrical Characteristics (VCC=18V, TA = 25°C , unless otherwise specified) Parameter Symbol Conditions Min. Typ. Max. Unit VF = 0.2V Max On Duty/ Min Off Duty 11 13.7 22 - VF SECTION Duty Ratio of CLM Operating K VF Voltage at Timer Operating Start V(VF) - 2.7 3.0 3.3 V VF Terminal Input Current I(VF) - - 2 6 µA 0.05 0.4 V OUTPUT SECTION Low Output Voltage High Output Voltage VOL1 VCC = 18V, IO = 10mA - VOL2 VCC = 18V, IO = 100mA - 0.7 1.4 V VOL3 VCC = 5V, IO = 1mA - 0.69 1.0 V VOL4 VCC = 5V, IO = 100mA - 1.3 2.0 V VOH1 VCC = 18V, IO = -10mA 16.0 16.5 - V VOH2 VCC = 18V, IO = -100mA 15.5 16.0 - V Rise Time TR No load - 50 - ns Fall Time TF No load - 35 - ns 120 140 160 °C THERMAL PROTECTION SECTION Thermal protection Operating Temperature T(TP) - 5 KA7577 Mechanical Dimensions Package Dimensions in millimeters 16-DIP #9 7.62 0.300 2.54 0.100 3.25 ±0.20 0.128 ±0.008 5.08 MAX 0.200 +0.10 0~15° 6 0.25 –0.05 +0.004 0.010 –0.002 0.38 0.014 MIN 3.30 ±0.30 0.130 ±0.012 1.50 ±0.10 0.059 ±0.004 #8 0.46 ±0.10 0.018 ±0.004 #16 19.80 MAX 0.780 #1 19.40 ±0.20 0.764 ±0.008 ( 0.81 ) 0.032 6.40 ±0.20 0.252 ±0.008 KA7577 Mechanical Dimensions (Continued) Package Dimensions in millimeters 20-SOP 0.05 0.002 1.14 ) 0.045 MIN 2.00 MAX 0.079 7.62 0.300 8° 5.40 ±0.20 0.213 ±0.008 0~ +0.10 0.20 -0.05 +0.004 0.008 -0.002 MAX0.10 MAX0.004 7.80 ±0.30 0.307 ±0.012 +0.10 0.40 -0.05 +0.004 0.016 -0.002 #11 1.27 0.050 #10 13.70 ±0.20 0.539 ±0.008 #20 14.10 MAX 0.555 #1 ( 1.70 ±0.10 0.067 ±0.004 0.60 ±0.20 0.024 ±0.008 7 KA7577 Ordering Information 8 Product Number Package Operating Temperature KA7577 16-DIP -25 ~ +85°C KA7577D 20-SOP -25 ~ +85°C 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. 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. www.fairchildsemi.com 9/25/00 0.0m 001 Stock#DSxxxxxxxx 2000 Fairchild Semiconductor International