SG3526 データシートの表示（PDF） - ON Semiconductor

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SG3526

Pulse Width Modulation Control Circuit

ON Semiconductor 

SG3526

Pulse Width Modulation

Control Circuit

The SG3526 is a high performance pulse width modulator

integrated circuit intended for fixed frequency switching regulators

and other power control applications.

Functions included in this IC are a temperature compensated

voltage reference, sawtooth oscillator, error amplifier, pulse width

modulator, pulse metering and steering logic, and two high current

totem pole outputs ideally suited for driving the capacitance of power

FETs at high speeds.

Additional protective features include soft start and undervoltage

lockout, digital current limiting, double pulse inhibit, adjustable dead

time and a data latch for single pulse metering. All digital control ports

are TTL and B−series CMOS compatible. Active low logic design

allows easy wired−OR connections for maximum flexibility. The

versatility of this device enables implementation in single−ended or

push−pull switching regulators that are transformerless or transformer

coupled. The SG3526 is specified over a junction temperature range of

0° to +125°C.

• 8.0 V to 35 V Operation

• 5.0 V ±1% Trimmed Reference

• 1.0 Hz to 400 kHz Oscillator Range

• Dual Source/Sink Current Outputs: ±100 mA

• Digital Current Limiting

• Programmable Dead Time

• Undervoltage Lockout

• Single Pulse Metering

• Programmable Soft−Start

• Wide Current Limit Common Mode Range

• Guaranteed 6 Unit Synchronization

18

1

http://onsemi.com

MARKING

DIAGRAM

18

PDIP−18

N SUFFIX

CASE 707

SG3526N

AWLYYWW

1

A = Assembly Location

WL = Wafer Lot

YY = Year

WW = Work Week

PIN CONNECTIONS

+Error 1

−Error 2

Compensation 3

CSoft−Start 4

Reset 5

−CS 6

+CS 7

18 Vref

17 VCC

16 Output B

15 Ground

14 VC

13 Output A

12 Sync

Vref 18

VCC

17 Reference

Regulator

Ground 15

Sync

RDeadtime

RT

CT

12

11

9

10

Oscillator

Under−

Voltage

Lockout

To Internal

Circuitry

Reset 5

CSoft−Start 4

Soft

Start

Compensation 3

VCC

+Error

−Error

1

2

+

−

−

+

100 mV Amp

7

+C.S.

−C.S.

6

+

−

Shutdown 8

Memory

F/F

S

SQ R Q

RQ

Metering

F/F

Toggle

F/F

Q

T

Q

Figure 1. Representative Block Diagram

Shutdown 8

RT 9

11 RDeadtime

10 CT

14

VC

13

Output

A

(Top View)

ORDERING INFORMATION

Device

Package

Shipping

SG3526N

PDIP−18

20 Units/Rail

16

Output

B

© Semiconductor Components Industries, LLC, 2006

1

July, 2006 − Rev. 4

Publication Order Number:

SG3526/D

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