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| www.fairchildsemi.com KA3501 PC SMPS Supervisory IC Features * * * * * * * Complete House Keeping Circuit Few External Components Positive Voltage Protection Negative Voltage Protection High Current Drive Output for SCR Precision Voltage Reference for 5V/12V Outputs Power Good Signal Generator with Hysteresis Description The KA3501 is complete housekeeping circuits for use in the secondary side of SMPS(Switched Mode Power Supply). This IC(Integrated Circuit) contains a precision voltage reference, protection circuits and a power good signal generator. It also has a high current drive output for use in conjunction with an external "crowbar" SCR. The reference voltage is trimmed to 2% for correct output voltages(+5V/ +12V) and power good signal generator is to monitor the voltage level of power good supply for safe operation in a microprocessor circuit. Using the KA3501 requires few external components to accomplish a complete housekeeping circuit for SMPS(Switched Mode Power Supply). The KA3501 is available in an 14-pin DIP. 14-DIP 1 Internal Block Diagram 4 VCC1(+5V) VCC 7 8 Vin1 Positive Voltage Protection START UP +5V Detecting COMP lchg Vin2 5 GATE 6 Feedback 14 2 Vref Negative Voltage Protection 11 PG INTERNAL BIAS VCC Detecting COMP +2.5V REFERENCE VOLTAGE 12 Ve VCC2(+12V) 3 1 Vcont 13 GND 9 Td 10 Timing Rev. 1.0.2 (c)2002 Fairchild Semiconductor Corporation KA3501 Pin Assignments #1 Vcont Vref Vcc2 Vcc1 Vin2 Gate Vcc #7 #14 Feedback GND K A 3 5 0 1 Ve PG Tim ing Td Vin1 #8 Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Pin Name Vcont Vref Vcc2 Vcc1 Vin2 Gate Vcc Vin1 Td Timing PG Ve GND Feedback Pin Function Description Reference Voltage Control Precision Reference Voltage +12V Output Voltage +5V Output Voltage UVP Input (Negative) Gate Drive Input for SCR Supply Voltage PG Input Reference Voltage Delay for PG PG Delay PG Output PG Ground (Open Emitter) Ground Feedback for Precision Reference Absolute Maximum Rating ( Ta = 25C) Parameter Supply Minimum Voltage Supply Maximum Voltage UV Input Voltage Minimum Gate Drive Current Operating Cathode Current Power Dissipation Operating Temperature Range Symbol Vcc(min) Vcc(max) Vuv IDR IK Pd Topr Value 5 35 24 -25 1 to 30 1 0 to 70 Unit V V V V A W C 2 KA3501 Electrical Characteristic (Refer to the test circuit , Vcc=20V, Ta=25C, unless otherwise stated) Parameter Temperature Stability for VREF PROTECTION SECTION Positive Protection Voltage Negative Protection Voltage Negative Input Resistor Gate Drive Current REFERENCE SECTION Reference Input Voltage Current Stability Absolute Precision of Internal Three Resistors Relative Deviation of Three Resistors Temperature Stability (Note1) Gain Bandwidth (Note1) POWER GOOD SECTION Detecting Input Voltage Detecting PG Voltage Hysteresis Voltage 1 Hysteresis Voltage 2 Charging Current for PG Delay PG Output Resistor PG Output Saturation Voltage PG Output Leakage Current TOTAL STANDBY CURRENT Supply Current Icc VCC = 20V , VCC1 = 5V 3 5 mA VIN1 VDET HY1 HY2 ICHG RPG VSAT IO(LKG) ISINK = 6mA 1.23 4.1 10 200 -8 7.7 1.28 4.3 20 250 -14 9.0 0.2 0.01 1.33 4.5 40 -20 10.3 0.4 1 V V mV mV uA k V uA VREF VREF Rint Rrate VREF GBW GV = 1 IK = 10mA IK=1mA to 10mA Ta = 0 to 70 C 2.44 2.50 5 0.5 13 1 2.56 20 20 3 17 V mV % % mV MHz VPOSI VNEGA RNEGA IDR Vcc1 = 5V Pin 4 to Pin 5 VGATE = 0.7 V 5.7 -1.5 8.5 -25 6.0 -2.5 10 -50 6.4 -3.5 11.5 V V k V Symbol VREF Conditions Min. Typ. Max. 17 Unit mV Note: 1.These parameters, although guaranteed, are not 100% tested in production 3 KA3501 Mechanical Dimensions Package Dimensions in millimeters 14-DIP 6.40 0.20 0.252 0.008 ( #1 #14 2.08 ) 0.082 19.80 MAX 0.780 19.40 0.20 0.764 0.008 #7 #8 7.62 0.300 3.25 0.20 0.128 0.008 0.20 0.008 MIN 5.08 MAX 0.200 3.30 0.30 0.130 0.012 0.25 -0.05 +0.10 0~15 0.010 -0.002 +0.004 4 2.54 0.100 0.46 0.10 0.018 0.004 1.50 0.10 0.059 0.004 KA3501 Ordering Information Product Number KA3501 Package 14-DIP Operating Temperature 0C ~ +70C 5 KA3501 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 CORPORATION. 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 10/9/02 0.0m 001 Stock#DSxxxxxxxx 2002 Fairchild Semiconductor Corporation 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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