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UC3845BD1R2G

更新时间： 2024-01-12 11:23:50

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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数据手册

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UC3845BD1R2G 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

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