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UC3845D Datasheet(PDF) 6 Page - ON Semiconductor |
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UC3845D Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 14 page UC3844, 45 UC2844, 45 6 MOTOROLA ANALOG IC DEVICE DATA Figure 13. Output Cross Conduction Figure 14. Supply Current versus Supply Voltage 100 ns/DIV VCC = 30 V CL = 15 pF TA = 25°C 25 20 15 10 5 0 0 10203040 VCC, SUPPLY VOLTAGE (V) RT = 10 k CT = 3.3 nF VFB = 0 V ISense = 0 V TA = 25°C PIN FUNCTION DESCRIPTION Pin Fi Di i 8–Pin 14–Pin Function Description 1 1 Compensation This pin is 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 1.0 MHz is possible. 5 – Gnd This pin is combined control circuitry and power ground (8–pin package only). 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. The output switches at one–half the oscillator frequency. 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 (14–pin package only) 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 (14–pin package only). 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 (14–pin package only) and is connected to back to the power source ground. – 2,4,6,13 NC No connection (14–pin package only). These pins are not internally connected. |
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