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UC3843BVN Datasheet(PDF) 7 Page - Motorola, Inc |
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UC3843BVN Datasheet(HTML) 7 Page - Motorola, Inc |
7 / 16 page UC3842B, 43B UC2842B, 43B 7 MOTOROLA ANALOG IC DEVICE DATA PIN FUNCTION DESCRIPTION Pin Fi Di i 8–Pin 14–Pin Function Description 1 1 Compensation This pin is the Error Amplifier output and is made available for loop compensation. 2 3 Voltage Feedback This is the inverting input of the Error Amplifier. It is normally connected to the switching power supply output through a resistor divider. 3 5 Current Sense A voltage proportional to inductor current is connected to this input. The PWM uses this information to terminate the output switch conduction. 4 7 RT/CT The Oscillator frequency and maximum Output duty cycle are programmed by connecting resistor RT to Vref and capacitor CT to ground. Operation to 500 kHz is possible. 5 Gnd This pin is the combined control circuitry and power ground. 6 10 Output This output directly drives the gate of a power MOSFET. Peak currents up to 1.0 A are sourced and sunk by this pin. 7 12 VCC This pin is the positive supply of the control IC. 8 14 Vref This is the reference output. It provides charging current for capacitor CT through resistor RT. 8 Power Ground This pin is a separate power ground return that is connected back to the power source. It is used to reduce the effects of switching transient noise on the control circuitry. 11 VC The Output high state (VOH) is set by the voltage applied to this pin. With a separate power source connection, it can reduce the effects of switching transient noise on the control circuitry. 9 Gnd This pin is the control circuitry ground return and is connected back to the power source ground. 2,4,6,13 NC No connection. These pins are not internally connected. |
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