UC3844BV

更新时间： 2024-11-23 08:26:15

品牌	Logo	应用领域
安森美 - ONSEMI		控制器
页数	文件大小	规格书
20页	320K
描述
HIGH PERFORMANCE CURRENT MODE CONTROLLERS

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中文翻译

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UC3844BV 数据手册

UC3844B, UC3845B,

UC2844B, UC2845B

High Performance

Current Mode Controllers

The UC3844B, UC3845B series are high performance fixed

frequency current mode controllers. They are specifically designed for

Off−Line and dc−dc converter applications offering the designer a

cost−effective solution with minimal external components. These

integrated circuits feature an oscillator, a temperature compensated

reference, high gain error amplifier, current sensing comparator, and a

high current totem pole output ideally suited for driving a power

MOSFET.

http://onsemi.com

PDIP−8

N SUFFIX

CASE 626

Also included are protective features consisting of input and

reference undervoltage lockouts each with hysteresis, cycle−by−cycle

current limiting, a latch for single pulse metering, and a flip−flop

which blanks the output off every other oscillator cycle, allowing

output deadtimes to be programmed from 50% to 70%.

SOIC−8

D1 SUFFIX

CASE 751

These devices are available in an 8−pin dual−in−line and surface

mount (SOIC−8) plastic package as well as the 14−pin plastic surface

mount (SOIC−14). The SOIC−14 package has separate power and

ground pins for the totem pole output stage.

The UCX844B has UVLO thresholds of 16 V (on) and 10 V (off),

ideally suited for off−line converters. The UCX845B is tailored for

lower voltage applications having UVLO thresholds of 8.5 V (on) and

7.6 V (off).

SOIC−14

D SUFFIX

CASE 751A

PIN CONNECTIONS

Features

Compensation

Voltage Feedback

Current Sense

ref

• Pb−Free Packages are Available

Output

• Trimmed Oscillator for Precise Frequency Control

• Oscillator Frequency Guaranteed at 250 kHz

• Current Mode Operation to 500 kHz Output Switching Frequency

• Output Deadtime Adjustable from 50% to 70%

• Automatic Feed Forward Compensation

• Latching PWM for Cycle−By−Cycle Current Limiting

• Internally Trimmed Reference with Undervoltage Lockout

• High Current Totem Pole Output

R /C

(Top View)

Compensation

ref

Voltage Feedback

Current Sense

Output

GND

R /C

Power Ground

• Undervoltage Lockout with Hysteresis

• Low Startup and Operating Current

(Top View)

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 2 of this data sheet.

DEVICE MARKING INFORMATION

See general marking information in the device marking

section on page 16 of this data sheet.

Semiconductor Components Industries, LLC, 2004

Publication Order Number:

September, 2004 − Rev. 3

UC3844B/D

12 3 4 5 6 7...20

中文翻译

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与UC3844BV相关器件

型号	品牌	获取价格	描述	数据表
UC3844BVD	ONSEMI	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3844BVD1	ONSEMI	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3844BVD1G	ONSEMI	获取价格	暂无描述
UC3844BVD1R2	ONSEMI	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3844BVD1R2	MOTOROLA	获取价格	1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO8, PLASTIC, SO-8
UC3844BVD1R2G	ONSEMI	获取价格	High Performance Current Mode Controllers
UC3844BVDG	ONSEMI	获取价格	High Performance Current Mode Controllers
UC3844BVDR2	ONSEMI	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3844BVDR2G	ONSEMI	获取价格	High Performance Current Mode PWM Controller, SOIC-14 NB, 2500-REEL
UC3844BVN	ONSEMI	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS

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