Datasheet > UC3844_06

UC3844_06

更新时间： 2024-11-23 04:48:15

品牌	Logo	应用领域
安森美 - ONSEMI		控制器
页数	文件大小	规格书
16页	617K
描述
High Performance Current Mode Controllers

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UC3844_06 数据手册

UC3844, UC3845, UC2844,

UC2845

High Performance

Current Mode Controllers

The UC3844, UC3845 series are high performance fixed frequency

current mode controllers. They are specifically designed for Off−Line

and DC−to−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.

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 dead

times to be programmed for 50% to 70%.

http://onsemi.com

PDIP−8

N SUFFIX

CASE 626

SOIC−14

D SUFFIX

CASE 751A

These devices are available in an 8−pin dual−in−line 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.

SOIC−8

D1 SUFFIX

CASE 751A

The UCX844 has UVLO thresholds of 16 V (on) and 10 V (off),

ideally suited for off−line converters. The UCX845 is tailored for

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

7.6 V (off).

PIN CONNECTIONS

Compensation

ref

Voltage Feedback

Features

Current Sense

R /C

Output

GND

• Current Mode Operation to 500 kHz Output Switching Frequency

• Output Deadtime Adjustable from 50% to 70%

• Automatic Feed Forward Compensation

(Top View)

• Latching PWM for Cycle−By−Cycle Current Limiting

• Internally Trimmed Reference with Undervoltage Lockout

• High Current Totem Pole Output

• Input Undervoltage Lockout with Hysteresis

• Low Startup and Operating Current

• Direct Interface with ON Semiconductor SENSEFETt Products

• Pb−Free Packages are Available

Compensation

ref

Voltage Feedback

Current Sense

Output

7(12)

GND

R /C

Power Ground

ref

8(14)

Undervoltage

Lockout

5.0V

Reference

(Top View)

ref

Undervoltage

Lockout

7(11)

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 14 of this data sheet.

R C

Output

6(10)

Flip

Flop

Oscillator

4(7)

Voltage

Feedback

PWR GND

5(8)

Latching

PWM

−

DEVICE MARKING INFORMATION

See general marking information in the device marking

section on page page 14 of this data sheet.

2(3)

Current

Sense

3(5)

Error

Amplifier

1(1)

Output

Comp.

GND 5(9)

Pin numbers in parenthesis are for the D suffix SOIC−14 package.

Figure 1. Simplified Block Diagram

Publication Order Number:

July, 2006 − Rev. 7

UC3844/D

12 3 4 5 6 7...16

中文翻译

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与UC3844_06相关器件

型号	品牌	获取价格	描述	数据表
UC3844_11	UTC	获取价格	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
UC3844_13	UTC	获取价格	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
UC3844A	STMICROELECTRONICS	获取价格	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
UC3844A	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
UC3844A	TI	获取价格	Current Mode PWM Controller
UC3844A	FCI	获取价格	High Performance Current Mode Controller
UC3844A-BW	FCI	获取价格	Current Mode PWM Controller Low Start-Up and Operating Current
UC3844AD	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
UC3844AD	TI	获取价格	Current Mode PWM Controller
UC3844AD1	STMICROELECTRONICS	获取价格	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

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