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| www.fairchildsemi.com KA7515 SMPS Controller Features * Good load regulation over a wide load for external components. * Internal soft-start for quiet start-up. * Start-up supply current less than 1.6mA. * Switch-oft supply current less than 10mA. * Burst operation under short-circuit conditions * Thermal shutdown through over-temperature. Description The KA7515 provides the necessary features to implement switching mode power supply with a minimal external parts count. Internally implemented circuits include 3V reference voltage block, supply voltage monitoring block to control output through supply voltage and overload amplifier block to control output by external road variation. The KA7515 controls the power MOSFET and performs all necessary regulation and monitoring function in free running flyback converters. 8-DIP 1 Internal Block Diagram Rev. 5.0 (c)2000 Fairchild Semiconductor International KA7515 Absolute Maximum Ratings (TA=25C) Parameter Supply Voltage Collector Supply Voltage Output current, Sink or Source Operating Temperature Storage Temperature Symbol VCC VC IO TOPR TSTG Value 20 13 12 -25 ~ + 85 -65 ~ + 150 Unit V V mA C C Electrical Characteristics (TA = 25C) Parameter Start-up Hysteresis Start-up Current (1) Start-up Current (2) Start-up Current (3) Switch On Voltage Switch Off Voltage Switch On Current Switch Off Current Voltage Limiter (Pin 2) Voltage Limiter (Pin 3) Control Input Voltage Gain In Control Range Basic Value Maximum Peak Value Overload Range Upper Limit Overload Range Lower Limit Gain In Overload Range Input Current In Short-Circuit Operation Peak Value (1) Peak Value (2) Output Pulse Width Output Pulse Width Current Consumption (1) Current Consumption (2) Overload Point V2(PK)1 V2(PK)2 tW1 tW2 I6 1 I6 2 -I2 V1 = 3.5V V1 = 0V V1 = 3.5V V1 = 0V V1 = 3.5V V1 = 0V V3 = V4, V2 = 0V 2.8 2.35 3.5 2.5 400 3.0 2.65 5 4 12 12 660 3.4 2.95 6.5 5.5 15 15 850 V V s s mA mA A IST1 IST2 IST3 V6E V6A I6E I6A V2(MAX) V3(MAX) VI(CTRL) GV(CTRL) V2B V2(MAX) VIH VIL GV(OVER) I1 V6 = 5V V6 = 8V V6 = V6E V1 = V4 = V8 = GND V1 = V4 = V8 = GND V1 = V4 = V8 = GND V1 = V4 = V8 = GND V6 = 10V (IC Switch-Off) V6 = 10V (IC Switch-Off) V6 = 10V (IC Switch-On) V6 = 10V (IC Switch-On) V6 = 10V (IC Switch-On) V6 = 10V (IC Switch-On) V6 = 10V (IC Switch-On) V6 = 10V (IC Switch-On) V6 = 10V (IC Switch-On) V6 = 10V (IC Switch-On) 11 6 5.8 5.8 370 48 0.9 2.8 370 60 1 90 0.5 1.0 1.1 12 6.5 9.0 8.0 6.8 6.8 400 51 1.0 3.0 400 200 2 140 0.75 1.5 1.6 13 7 12.0 10.0 7.8 7.8 430 54 1.15 3.4 430 290 3 180 mA mA mA V V mA mA V V mV dB V V mV mV dB A Symbol Conditions Min. Typ. Max. Unit 2 KA7515 Electrical Characteristics (TA = 25C) (Continued) Correction Current Positive Value Negative Value Threshold Value Delay Time Saturation Voltage (1) Saturation Voltage (2) Rising Edge Falling Edge Under VTG. Protection (1) Over VTG. Protection Under VTG. Protection (2) Overtemperature Protection Voltage Pin 3 V3 I3 = 1mA 0.35 0.5 V V8(P) V8(N) V8(S) tD VSAT1 VSAT2 +dV5/dt -dV5/dt V6(UV) V6(MAX) V3(UV) TJ I5 = -1.0A I5 = 1.0A V1 = 3.5V V1 = 3.5V V6MIN = V6a + V6 I8 = 1mA I8 = -1mA 0.7 0.15 40 4.0 50 0.3 14 0.925 150 0.75 0.22 50 0.4 2.5 2.5 50 75 0.5 15 1 175 0.8 0.25 60 0.7 3.0 3.0 1 16 1.075 200 V V mV s V V V/s V/s V V V C 3 KA7515 Mechanical Dimensions Package Dimensions in millimeters 8-DIP 1.524 0.10 0.018 0.004 0.060 0.004 0.46 0.10 6.40 0.20 0.252 0.008 ( #1 #8 9.20 0.20 0.362 0.008 9.60 MAX 0.378 #4 #5 2.54 0.100 5.08 MAX 0.200 7.62 0.300 3.40 0.20 0.134 0.008 3.30 0.30 0.130 0.012 0.33 MIN 0.013 0.79 ) 0.031 0.25 -0.05 0~15 +0.10 0.010 -0.002 +0.004 4 KA7515 Ordering Information Product Number KA7515 Package 8-DIP Operating Temperature -25 ~ + 85C 5 KA7515 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. |
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