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AN4003 Datasheet(PDF) 4 Page - Fairchild Semiconductor |
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AN4003 Datasheet(HTML) 4 Page - Fairchild Semiconductor |
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4 / 28 page  4 Rev C, November 1999 Pin No. Name Function 1 VCC Supply voltage. Operating range is 14V~30V. VCC =20V, Ta=25°C at test. 2 COMP Error amplifier output. It is connected to non-inverting input of pulse width modulator comparator. 3 E/A(-) Error amplifier inverting input. Its reference voltage is always 1.25V. 4 E/A(+) Error amplifier non-inverting input feedback voltage.This pin may be used to sense power supply output voltage. 5 TREM Remote on/off delay. Ton/Toff=8ms/24ms (Typ.) with C=0.1µF. Its high/low threshold voltage is 1.8V/0.6V. 6 REM Remote on/off input. It is TTL operation and its threshold voltage is 1.4V. Voltage at this pin can reach normal 4.6V, with absolutely maximum voltage, 5.25V. 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. 7 RT Oscillation frequency setting R. (Test Condition RT=10kΩ) 8 CT Oscillation frequency setting C. (Test Condition CT=0.01µF) 9 DET Under-voltage detect pin. Its threshold voltage is 1.25V Typ. 10 TPG PG delay. Td=250ms (Typ) with CPG=2.2µF. The high/low threshold voltage are 1.8V/0.6V and the voltage of Pin10 is clamped at 2.9V for noise margin. 11 PG Power good output signal. PG = “High” means that the power is “Good” for operation and PG = “Low” means “Power fail”. 12 Vref Precision voltage reference trimmed to 2%. (Typical Value = 5.03V) 13 V3.3 Over voltage protection for output 3.3V. (Typical Value = 4.1V) 14 V5 Over voltage protection for output 5V. (Typical Value = 6.2V) 15 V12 Over voltage protection for output 12V. (Typical Value = 14.2V) 16 PT This is prepared for an extra OVP input or another protection signal. (Typical Value = 1.25V) 17 TUVP Timing pin for under voltage protection blank-out time. Its threshold voltage is 1.8V and clamped at 2.9V after full charging. Target of delay time is 250ms and it is realized through external (C=2.2µF). 18 GND Signal ground. 19 DTC Deadtime control input. The dead-time control comparator has an effective 120mV input offset which limits the minimum output dead time. Dead time may be imposed on the output by setting the dead time control input to a fixed voltage, ranging between 0V to 3.3V. 20 C2 Output drive pin for push-pull operation. 21 E Power ground. 22 C1 Output drive pin for push-pull operation. |
Similar Part No. - AN4003 |
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Similar Description - AN4003 |
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