NCP1217(2004) 查看數據表（PDF） - ON Semiconductor

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NCP1217
(Rev.:2004)

Enhanced PWM Current-Mode Controller for High-Power Universal Off-Line Supplies

ON Semiconductor 

EMI

FILTER

UNIVERSAL

INPUT

NCP1217, NCP1217A

See Application

Section

+

NCP1217

Adj HV

1

8

2 FB

7

3 CS VCC 6

Gnd Drv

4

5

Aux.

Ramp Adjustment +

VOUT

+

Figure 1. Typical Application Example

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1

Adj

Adjust the skipping peak current This pin lets you adjust the level at which the cycle skipping process

takes place. Shorting this pin to ground permanently disables the skip

cycle feature.

By bringing this pin above 3.1 V, you permanently shut off the device.

2

FB

Sets the peak current setpoint By connecting an optocoupler to this pin, the peak current setpoint is

adjusted accordingly to the output power demand.

3

CS

Current sense input

This pin senses the primary current and routes it to the internal

comparator via an L.E.B. By inserting a resistor in series with the pin, you

control the amount of ramp compensation you need.

4

Gnd

The IC ground

−

5

Drv

Driving pulses

The driver’s output to an external MOSFET.

6

VCC

Supplies the IC

7

NC

−

This pin is connected to an external bulk capacitor of typically 22 mF.

This unconnected pin ensures adequate creepage distance.

8

HV

Ensures a clean and lossless

Connected to the high−voltage rail, this pin injects a constant current into

startup sequence

the VCC capacitor during the startup sequence.

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