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NCP1253

Current-Mode PWM Controller for Off-line Power Supplies

ON Semiconductor 

NCP1253

Current-Mode PWM

Controller for Off-line

Power Supplies

The NCP1253 is a highly integrated PWM controller capable of

delivering a rugged and high performance offline power supply in a

tiny TSOP−6 package. With a supply range up to 28 V, the controller

hosts a jittered 65 kHz or 100 kHz switching circuitry operated in peak

current mode control. When the power on the secondary side starts to

decrease, the controller automatically folds back its switching

frequency down to a minimum level of 26 kHz. As the power further

goes down, the part enters skip cycle while limiting the peak current.

To avoid sub harmonic oscillations in CCM operation, adjustable

slope compensation is available via the series inclusion of a simple

resistor in the current sense signal.

Besides the auto−recovery timer−based short−circuit protection, an

Over Voltage Protection on the VCC pin protects the whole circuitry in

case of optocoupler destruction or adverse open loop operation.

Features

• Fixed−Frequency 65 kHz or 100 kHz Current−Mode Control

Operation

• Frequency Foldback Down to 26 kHz and Skip−Cycle in Light Load

Conditions

• Adjustable Ramp Compensation

• Internally Fixed 4 ms soft−start

• Timer−based Auto−Recovery or Latched Short−Circuit Protection

• Frequency Jittering in Normal and Frequency Foldback Modes

• Latched OVP on VCC

• Up to 28 V VCC Operation

• Extremely Low No−load Standby Power

• These are Pb−Free Devices

Typical Applications

• Ac−dc Converters for TVs, Set−top Boxes and Printers

• Offline Adapters for Notebooks and Netbooks

http://onsemi.com

1

TSOP−6

CASE 318G

STYLE 13

MARKING DIAGRAM

53xAYWG

G

1

53

= Specific Device Code

x

= A, 2, C, or D

A

= Assembly Location

Y

= Year

W

= Work Week

G

= Pb−Free Package

(Note: Microdot may be in either location)

PIN CONNECTIONS

GND 1

6 DRV

FB 2

NC 3

5 VCC

4 CS

(Top View)

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 2 of this data sheet.

© Semiconductor Components Industries, LLC, 2012

1

January, 2012 − Rev. 0

Publication Order Number:

NCP1253/D

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