NCP1253 datasheet(2/15 Pages) ONSEMI

Part #	NCP1253

Description	Current-Mode PWM Controller for Off-line Power Supplies

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1253

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2

1

2

3

6

4

5

NCP1253

Vbulk

.

ramp

comp.

Vout

.

Figure 1. Typical Application Schematic

PIN FUNCTION DESCRIPTION

Pin No.

Pin Name

Function

Description

1

GND

−

The controller ground.

2

FB

Feedback pin

Hooking an optocoupler collector to this pin will allow

regulation.

3

NC

Non−connected pin

The pin is electrically inert and can be grounded if necessary

4

CS

Current sense + ramp compensation

This pin monitors the primary peak current but also offers a

means to introduce slope compensation.

5

VCC

Supplies the controller – protects the IC

This pin is connected to an external auxiliary voltage. An OVP

comparator monitors this pin and offers a means to latch the

converter in fault conditions.

6

DRV

Driver output

The driver’s output to an external MOSFET gate.

OPTIONS

Controller

Frequency

OCP Latched

OCP Auto−Recovery

NCP1253ASN65T1G

65 kHz

Yes

No

NCP1253BSN65T1G

65 kHz

No

Yes

NCP1253ASN100T1G

100 kHz

Yes

No

NCP1253BSN100T1G

100 kHz

No

Yes

ORDERING INFORMATION

Device

Package

Marking

OCP

Protection

Switching

Frequency

(kHz)

Package

Shipping†

NCP1253ASN65T1G

53A

Latch

65

TSOP−6

(Pb−Free)

3000 / Tape & Reel

NCP1253BSN65T1G

532

Auto

Recovery

65

NCP1253ASN100T1G

53C

Latch

100

NCP1253BSN100T1G

53D

Auto

Recovery

100

†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging

Specifications Brochure, BRD8011/D.

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