UC1527AN

更新时间： 2024-11-05 03:57:27

品牌	Logo	应用领域
德州仪器 - TI		脉冲
页数	文件大小	规格书
9页	440K
描述
Regulating Pulse Width Modulators

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UC1527AN 数据手册

UC1525A/27A

UC2525A/27A

UC3525A/27A

Regulating Pulse Width Modulators

FEATURES

DESCRIPTION

• 8 to 35V Operation

The UC1525A/1527A series of pulse width modulator integrated circuits are de-

signed to offer improved performance and lowered external parts count when

used in designing all types of switching power supplies. The on-chip +5.1V ref-

erence is trimmed to ±1% and the input common-mode range of the error ampli-

fier includes the reference voltage, eliminating external resistors. A sync input to

the oscillator allows multiple units to be slaved or a single unit to be synchro-

nized to an external system clock. A single resistor between the C_Tand the dis-

charge terminals provides a wide range of dead-time adjustment. These

devices also feature built-in soft-start circuitry with only an external timing ca-

pacitor required. A shutdown terminal controls both the soft-start circuitry and

the output stages, providing instantaneous turn off through the PWM latch with

pulsed shutdown, as well as soft-start recycle with longer shutdown commands.

These functions are also controlled by an undervoltage lockout which keeps the

outputs off and the soft-start capacitor discharged for sub-normal input volt-

ages. This lockout circuitry includes approximately 500mV of hysteresis for jit-

ter-free operation. Another feature of these PWM circuits is a latch following the

comparator. Once a PWM pulse has been terminated for any reason, the out-

puts will 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 UC1525A output stage features NOR logic,

giving a LOW output for an OFF state. The UC1527A utilizes OR logic which

results in a HIGH output level when OFF.

• 5.1V Reference Trimmed to ±1%

• 100Hz to 500kHz Oscillator Range

• Separate Oscillator Sync Terminal

• Adjustable Deadtime Control

• Internal Soft-Start

• Pulse-by-Pulse Shutdown

• Input Undervoltage Lockout with

Hysteresis

• Latching PWM to Prevent Multiple

Pulses

• Dual Source/Sink Output Drivers

BLOCK DIAGRAM

OSC

OUT

VREF

NOR

UVLO

Lockout

Reference

Regulator

+VIN 15

OUTPUT A

GROUND 12

To internal

circuitry

SYNC

Flip

Flop

NOR

OSC

OUTPUT B

DISCHARGE

UC1525A Output Stage

COMP

COMPENSATION

INV INPUT

PWM

La tch

Error

Amp

V_REF

50 µA

OUTPUT A

NI INPUT

SOFTSTART

3 kΩ

SHUTDOWN 10

OUTPUT B

5 kΩ

UC1527A Output Stage

SLUS191B - February 1997 - Revised June 2005

12 3 4 5 6 7...9

中文翻译

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与UC1527AN相关器件

型号	品牌	获取价格	描述	数据表
UC1527AQ	TI	获取价格	Regulating Pulse Width Modulators
UC1527B	TI	获取价格	Regulating Pulse Width Modulators
UC1527BDW	TI	获取价格	Regulating Pulse Width Modulators
UC1527BJ	TI	获取价格	Regulating Pulse Width Modulators
UC1527BL	TI	获取价格	Regulating Pulse Width Modulators
UC1527BN	TI	获取价格	Regulating Pulse Width Modulators
UC1527BQ	TI	获取价格	Regulating Pulse Width Modulators
UC1543	TI	获取价格	Power Supply Supervisory Circuit
UC1543_13	TI	获取价格	Power Supply Supervisory Circuit
UC1543_16	TI	获取价格	Power Supply Supervisory Circuit

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