NCP1217P65G(2010) 데이터 시트보기 (PDF) - ON Semiconductor

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NCP1217P65G
(Rev.:2010)

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

ON Semiconductor 

EMI

FILTER

UNIVERSAL

INPUT

NCP1217, NCP1217A

See Application

Section

+

NCP1217

1 Adj HV 8

2 FB

7

3 CS VCC 6

Gnd Drv

4

5

Aux.

Ramp Adjustment +

Figure 1. Typical Application Example

VOUT

+

PIN FUNCTION DESCRIPTION

Pin No. Pin Name

Function

1

Adj

Adjust the skipping peak current

2

FB

Sets the peak current setpoint

3

CS

Current sense input

4

GND

The IC ground

5

Drv

Driving pulses

6

VCC

Supplies the IC

7

NC

--

8

HV

Ensures a clean and lossless

startup sequence

Description

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.

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

justed accordingly to the output power demand.

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

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

the amount of ramp compensation you need.

--

The driver’s output to an external MOSFET.

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

This unconnected pin ensures adequate creepage distance.

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

the VCC capacitor during the startup sequence.

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