DAP025C datasheet(2/28 Pages) ONSEMI

2 / 28 page

DAP018A/B/C/D/F

http://onsemi.com

*See

Note

OVP

Freq.

Jitter

Foldback

Adj.

Vbulk

NC /

A&C

Vout

Gnd

Ramp

Gnd

Timer

Delay

*This resistor

prevents from

negatively biasing

the HV pin (14) at

power−off. Typical

value is 4.7 kW.

Figure 1. Typical Application Example

OTP

ROPPL

ROPPU

Pin No.

Pin Name

Function

Pin Description

OPP

Adjust the Over Power Protection

A resistive divider from the auxiliary winding to this pin sets the

OPP compensation level.

OVP

Input voltage to latch comparator

This pin offers an over−voltage protection input.

CTimer

Timer

Wiring a capacitor to ground helps selecting the timer duration.

Jitter

Frequency jittering speed

This pin offers a way to adjust the frequency modulation pace.

Foldback / skip

Frequency foldback /

skip cycle adjustment

By connecting a resistor to ground, it becomes possible to re-

duce the level at which frequency foldback occurs.

Feedback pin

Hooking an optocoupler collector to this pin will allow regulation.

Current sense +

ramp compensation

This pin monitors the primary peak current but also offers a

means to introduce ramp compensation.

GND

−

The controller ground.

DRV

Driver output

The driver’s output to an external MOSFET gate.

VCC

Supplies the controller

This pin is connected to an external auxiliary voltage.

Brown−out, B and D versions

For B and D versions, this pin offers a brown−out input.

OTP

NTC connection

This pin connects to a pulldown NTC resistor for over temperat-

ure protection (OTP).

−

Non−connected for improved creepage.

High−voltage input

Connected to the bulk capacitor, this pin powers the internal

current source to deliver a startup current.

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