Datasheet > SG3525A

SG3525A

更新时间： 2024-11-12 14:52:19

品牌	Logo	应用领域
美国微芯 - MICROCHIP		/
页数	文件大小	规格书
13页	624K
描述
The SG1525A/1527A series of pulse width modulator integrated circuit s are designed to offer impro

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SG3525A 数据手册

SG1525A/SG2525A/SG3525A

SG1527A/SG2527A/SG3527A

Regulating Pulse Width Modulator

Description

Features

The SG1525A/1527A series of pulse width modulator integrated

circuits are designed to offer improved performance and lower

external parts count when used to implement all types of switching

power supplies. The on-chip +5.1 V reference is trimmed to ±1%

initial accuracy and the input common-mode range of the error

amplifier includes the reference voltage, eliminating external

potentiometers and divider resistors. A Sync input to the oscillator

allows multiple units to be slaved together, or a single unit to be

synchronized to an external system clock. A single resistor between

the C_Tpin and the Discharge pin provides a wide range of deadtime

adjustment. These devices also feature built-in soft-start circuitry

with only a timing capacitor required externally. A Shutdown pin

controls both the soft-start circuitry and the output stages, providing

instantaneous turn-off with soft-start recycle for slow turn-on. These

functions are also controlled by an undervoltage lockout which

keeps the outputs off and the soft-start capacitor discharged for

input voltages less than that required for normal operation. Another

unique feature of these PWM circuits is a latch following the

comparator. Once a PWM pulse has been terminated for any

reason, the outputs remain off for the duration of the period. The

latch is reset with each clock pulse. The output stages are totem-

pole designs capable of sourcing or sinking in excess of 200mA.

The SG1525A output stage features NOR logic, giving a LOW

output for an OFF state. The SG1527A utilizes OR logic, which

results in a HIGH output level when OFF.

8V to 35V Operation

5.1V Reference Trimmed to 1%

100Hz to 500kHz Oscillator Range

Separate Oscillator Sync Terminal

Adjustable Deadtime Control

Internal Soft-start

Input Undervoltage Lockout

Latching P.W.M. to Prevent Multiple Pulses

Dual Source/Sink Output Drivers

High Reliability Features

Following are the high reliability features of SG1525A

and SG1527A:

Available to MIL-STD-883, ¶ 1.2.1

MIL-M38510/12602BEA - JAN1525AJ

MIL-M38510/12604BEA - JAN1527AJ

MSC-AMS level “S” Processing Available

Block Diagram

V_REF

V_C

U.V.

LOCKOUT

REFERENCE

REGULATOR

+V_IN

GROUND

INTERNAL CIRCUITRY

OUTPUT A

OSC OUTPUT

SYNC

R_T

OSCILLATOR

C_T

OUTPUT B

F/F

DISCHARGE

SG1525A OUTPUT STAGE

V_C

P.W.M.

COMPENSATION

LATCH

V_IN

INV. INPUT

N.I. INPUT

OUTPUT A

ERROR

AMP

50µA

SOFT-SART

SHUTDOWN

V_REF

OUTPUT B

SG1527A OUTPUT STAGE

Figure 1 · Block Diagram

September 2014 Rev. 1.4a

www.microsemi.com

12 3 4 5 6 7...13

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与SG3525A相关器件

型号	品牌	获取价格	描述	数据表
SG3525A_05	ONSEMI	获取价格	Pulse Width Modulator Control Circuit
SG3525ACJ	Linear	获取价格	IC SWITCHING CONTROLLER, CDIP, Switching Regulator or Controller
SG3525ADW	MICROSEMI	获取价格	REGULATING PULSE WIDTH MODULATOR
SG3525ADW	ONSEMI	获取价格	Pulse Width Modulator Control Circuit
SG3525ADW	MOTOROLA	获取价格	PULSE WIDTH MODULATOR CONTROL CIRCUITS
SG3525ADWG	ONSEMI	获取价格	Pulse Width Modulator Control Circuit
SG3525ADWR2	ONSEMI	获取价格	Pulse Width Modulator Control Circuit
SG3525ADWR2G	ONSEMI	获取价格	Pulse Width Modulator Control Circuit
SG3525AJ	MICROSEMI	获取价格	REGULATING PULSE WIDTH MODULATOR
SG3525AJ	Linear	获取价格	Regulating Pulse Width Modulators

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