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NCP1031

Low Power PWM Controller with On−Chip Power Switch and Startup Circuits for 48V Telecom Systems

ON Semiconductor 

NCP1030, NCP1031

Low Power PWM Controller

with On−Chip Power Switch

and Startup Circuits for

48 V Telecom Systems

The NCP1030 and NCP1031 are a family of miniature high−voltage

monolithic switching regulators with on−chip Power Switch and Startup

Circuits. The NCP103x family incorporates in a single IC all the active

power, control logic and protection circuitry required to implement, with

minimal external components, several switching regulator applications,

such as a secondary side bias supply or a low power dc−dc converter.

This controller family is ideally suited for 48 V telecom, 42 V automotive

and 12 V input applications. The NCP103x can be configured in any

single−ended topology such as forward or flyback. The NCP1030 is

targeted for applications requiring up to 3 W, and the NCP1031 is

targeted for applications requiring up to 6 W.

The internal error amplifier allows the NCP103x family to be easily

configured for secondary or primary side regulation operation in

isolated and non−isolated configurations. The fixed frequency oscillator

is optimized for operation up to 1 MHz and is capable of external

frequency synchronization, providing additional design flexibility. In

addition, the NCP103x incorporates individual line undervoltage and

overvoltage detectors, cycle by cycle current limit and thermal

shutdown to protect the controller under fault conditions. The preset

current limit thresholds eliminate the need for external sensing

components.

Features

• On Chip High 200 V Power Switch Circuit and Startup Circuit

• Internal Startup Regulator with Auxiliary Winding Override

• Operation up to 1 MHz

• External Frequency Synchronization Capability

• Frequency Fold−down Under Fault Conditions

• Trimmed ± 2% Internal Reference

• Line Undervoltage and Overvoltage Detectors

• Cycle by Cycle Current Limit Using SENSEFETt

• Active LEB Circuit

• Overtemperature Protection

• Internal Error Amplifier

• Pb−Free Packages are Available

Typical Applications

• POE (Power Over Ethernet)/PD. Refer to Application Note AND8247.

• Secondary Side Bias Supply for Isolated dc−dc Converters

• Stand Alone Low Power dc−dc Converter

• Low Power Bias Supply

• Low Power Boost Converter

http://onsemi.com

MARKING

DIAGRAMS

8

1

Micro8t

DM SUFFIX

CASE 846A

8

1030

AYWG

G

1

8

1

SO−8

D SUFFIX

CASE 751

8

N1031

ALYW

G

1

1030/N1031 = Specific Device Code

A

= Assembly Location

L

= Wafer Lot

Y

= Year

W

= Work Week

G

= Pb−Free Package

(Note: Microdot may be in either location)

PIN CONNECTIONS

1

GND

2

CT

3

VFB

4

COMP

8

VDRAIN

7

VCC

6

UV

5

OV

(Top View)

ORDERING INFORMATION

Device

Package

Shipping†

NCP1030DMR2

Micro8 4000/Tape & Reel

NCP1030DMR2G Micro8 4000/Tape & Reel

(Pb−Free)

NCP1031DR2

SO−8 2500/Tape & Reel

NCP1031DR2G

SO−8 2500/Tape & Reel

(Pb−Free)

†For information on tape and reel specifications,

including part orientation and tape sizes, please

refer to our Tape and Reel Packaging Specification

Brochure, BRD8011/D.

© Semiconductor Components Industries, LLC, 2006

1

January, 2006 − Rev. 6

Publication Order Number:

NCP1030/D

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