UC3825A

更新时间： 2024-11-03 22:41:47

品牌	Logo	应用领域
德州仪器 - TI		控制器
页数	文件大小	规格书
15页	302K
描述
High Speed PWM Controller

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中文翻译

获取价格

数据手册

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UC3825A 数据手册

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www.ti.com

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SLUS334C − AUGUST 1995 − REVISED AUGUST 2004

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FEATURES

DESCRIPTION

Improved Versions of the UC3823/UC3825

PWMs

The UC3823A and UC3823B and the UC3825A and

UC3825B family of PWM controllers are improved

versions of the standard UC3823 and UC3825 family.

Performance enhancements have been made to several

of the circuit blocks. Error amplifier gain bandwidth product

is 12 MHz, while input offset voltage is 2 mV. Current limit

threshold is assured to a tolerance of 5%. Oscillator

discharge current is specified at 10 mA for accurate dead

time control. Frequency accuracy is improved to 6%.

Startup supply current, typically 100 µA, is ideal for off-line

applications. The output drivers are redesigned to actively

sink current during UVLO at no expense to the startup

current specification. In addition each output is capable of

2-A peak currents during transitions.

Compatible with Voltage-Mode or

Current-Mode Control Methods

Practical Operation at Switching Frequencies

to 1 MHz

50-ns Propagation Delay to Output

High-Current Dual Totem Pole Outputs

(2-A Peak)

Trimmed Oscillator Discharge Current

Low 100-µA Startup Current

Pulse-by-Pulse Current Limiting Comparator

Latched Overcurrent Comparator With Full

Cycle Restart

BLOCK DIAGRAM

CLK/LEB 4

(60%)

13 VC

11 OUTA

OSC

RAMP

EAOUT

1.25 V

E/A

14 OUTB

12 PGND

PWM

LATCH

PWM COMPARATOR

9 mA

INV

SOFT−START COMPLETE

RESTART

CURRENT

LIMIT

5 V

250mA

DELAY

LATCH

1.0 V

1.2 V

0.2 V

OVER CURRENT

ILIM 9

RESTART

DELAY

FAULT LATCH

UVLO

VCC 15

GND 10

”B” 16V/10V

”A” 9.2V/8.4V

INTERNAL

BIAS

VREF

5.1 V

ON/OFF

4 V

GOOD

REF

16 5.1 VREF

UDG−02091

* On the UC1823A version, toggles Q and Q are always low.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments

semiconductor products and disclaimers thereto appears at the end of this data sheet.

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中文翻译

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与UC3825A相关器件

型号	品牌	获取价格	描述	数据表
UC3825AD	TI	获取价格	High Speed PWM Controller
UC3825ADTR	TI	获取价格	High Speed PWM Controller
UC3825ADW	TI	获取价格	High Speed PWM Controller
UC3825ADWG4	TI	获取价格	HIGH-SPEED PWM CONTROLLER
UC3825ADWR	TI	获取价格	IC SWITCHING CONTROLLER, Switching Regulator or Controller
UC3825ADWTR	TI	获取价格	High Speed PWM Controller
UC3825ADWTR	ROCHESTER	获取价格	2.2 A SWITCHING CONTROLLER, 1150 kHz SWITCHING FREQ-MAX, PDSO16, GREEN, SOIC-16
UC3825ADWTRG4	TI	获取价格	High Speed PWM Controller
UC3825AJ	ETC	获取价格	Analog IC
UC3825AL	ETC	获取价格	Analog IC

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