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NCP1251

Current-Mode PWM Controller for Off-line Power Supplies

ON Semiconductor 

Vbulk

OVP

OPP

NCP1251

1

6

2

5

3

4

NCP1251

.

.

.

ramp

comp.

Vo u t

Figure 1. Typical Application Example

Pin N5

1

2

3

Pin Name

GND

FB

OPP/OVP

4

CS

5

VCC

6

DRV

Function

−

Feedback pin

Adjust the Over Power Protection

Latches off the part

Current sense + ramp

compensation

Supplies the controller

Driver output

Pin Description

The controller ground.

Hooking an optocoupler collector to this pin will allow regulation.

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

compensation level. When brought above 3 V, the part is fully latched off.

This pin monitors the primary peak current but also offers a means to

introduce ramp compensation.

This pin is connected to an external auxiliary voltage and supplies the

controller. When the VCC exceeds a certain level, the part permanently

latches off.

The driver’s output to an external MOSFET gate.

OPTIONS

Controller

NCP1251ASN65T1G

NCP1251BSN65T1G

NCP1251ASN100T1G

NCP1251BSN100T1G

Frequency

65 kHz

65 kHz

100 kHz

100 kHz

OCP Latched

Yes

No

Yes

No

OCP Auto−Recovery

No

Yes

No

Yes

ORDERING INFORMATION

Device

Package Marking

OCP Protection Switching Frequency

Package

Shipping†

NCP1251ASN65T1G

5AA

Latch

65 kHz

NCP1251BSN65T1G

5A2

NCP1251ASN100T1G

5AC

Autorecovery

Latch

65 kHz

100 kHz

TSOP−6

(Pb−Free)

3000 /

Tape & Reel

NCP1251BSN100T1G

5AD

Autorecovery

100 kHz

†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.

http://onsemi.com

2

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