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KA3502 数据表(PDF) 3 Page - Fairchild Semiconductor |
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KA3502 数据表(HTML) 3 Page - Fairchild Semiconductor |
3 / 14 page KA3502 3 Pin Description Pin Number Pin Name Pin Function Descrition 1 V33 +3.3 V Output Voltage of SMPS Secondary side 2 V5 +5 V Output Voltage of SMPS Secondary side 3 V12 +12 V Output Voltage of SMPS Secondary side 4ADJ Adjustable OVP Input. Its Threshold Voltage is 1.26 V. This pin can be used for another protection signal. 5 VCC Supply Voltage. Operating range is 15 V ~ 24 V. Vcc=18 V, Ta=25 °C at test. 6PWM Remote On/Off Output. This signal controls the primary power switch (PWM IC) through an Opto-coupler. Maximum current rating is 30 mA. When PWM="Low", the main SMPS is operational and If PWM="High", the main SMPS is turned-off. 7REM Remote On/Off Input. It is TTL operation and its threshold voltage is 1.4 V. Voltage at this pin can reach normally 4.6 V, with absolutely maximum voltage, 5.25 V. If REM="Low", PWM="Low". That means the main SMPS is operational. When REM ="High", then PWM="High" and the main SMPS is turned-off. 8Trem Remote On/Off delay. Ton/Toff=8 ms/24 ms (Typ.) with Ctrem=0.1uF. Its High/Low threshold voltage is 2 V/0.7 V and the maximum voltage after full charging is about 2.8 V. So, ∆V (Chg.) = 2 V, ∆V (Dischg.) = 2.1 V Typ. 9PG Power Good output signal. PG="High" means that the power is "Good" for operation and PG="Low" means "Power Fail". 10 Topr PG Delay. Td=250 ms (Typ.) with Ctopr=2.2uF. The High/Low threshold voltage are 2 V/1.3 V and the voltage of PIN 10 is clamped at 5.2 V for Noise margin. 11 UV Under-Voltage Detect Pin. Its threshold voltage is 1.26V ± 20mV Typ. 12 FB2 Feedback for Precision Reference2. Absolute min/max current rating is 1 mA/30 mA. 13 VREF2 Precision Reference 2 input Voltage. This circuit equals to KA431 and it is designed for an Auxiliary voltage, +5 Vs. It is trimmed to ± 1.6%. 14 VREF1 Precision Reference 1 Input Voltage. This circuit equals to KA431 and it is for corrective output voltages of +5 V/+12 V. It's trimmed to ± 1.6%. 15 FB1 Feedback for Precision Reference1. Absolute min/max current rating is 2 mA/30 mA because of internal connection. 16 GND Ground 17 Tsur Timing pin for Over Current Protection blank-out time. Its threshold voltage is 2 V and clamped at 2.7 V after full charging. Target of delay time is 20 ms~30 ms and it is realized through external R & C. 18 IS12 Current Sense Input for +12V. This pin is connected to the Current Sensing resistor or inductor. If the voltage drop of the resistor or inductor is larger than the fixed offset voltage ( 65 mV Typ.), PWM becomes "High" after some delay and the main SMPS is turned-off. 19 IS5 Current Sense Input for +5 V. The OCP Offset voltage for +5 V is 50 mV 20 IS33 Current Sense Input for +3.3 V. The OCP Offset voltage for +3.3 V is 135 mV |
类似零件编号 - KA3502 |
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类似说明 - KA3502 |
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