Datasheet > UC3844AY

UC3844AY

更新时间： 2024-11-22 23:38:59

品牌	Logo	应用领域
其他 - ETC		模拟IC
页数	文件大小	规格书
8页	231K
描述
Analog IC

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UC3844AY 数据手册

LIN DOC #: 1840

UC184xA/284xA/384xA

C U R R E N T M O D E P W M C O N T R O L L E R

P R O D U C T I O N D A T A S H E E T

T H E I N F I N I T E P O W E R O F I N N O V A T I O N

DESCRIPTION

KEY FEATURES

■ LOW START-UP CURRENT. (0.5mA max.)

■ TRIMMED OSCILLATOR DISCHARGE

The UC184xA family of control ICs

provides all the necessary features to

implement off-line fixed-frequency,

current-mode switching power supplies

with a minimum of external compo-

nents. The current mode architecture

demonstrates improved load regulation,

pulse-by-pulse current limiting and

inherent protection of the power supply

output switch. The IC includes: A

bandgap reference trimmed to ±1%

accuracy, an error amplifier, a current

sense comparator with internal clamp to

1V, a high current totem pole output

stage for fast switching of power

MOSFET's, and an externally program-

mable oscillator to set frequency and

CURRENT. (See Product Highlight)

maximum duty cycle. The under-

voltage lock-out is designed to operate

with 250µA typ. start-up current,

allowing an efficient bootstrap supply

voltage design. Available options for

this family of products, such as start-up

voltage hysteresis and duty cycle, are

summarized below in the Available

Options section. The UC184xA family

of control ICs is also available in 14-pin

SOIC package which makes the Power

Output Stage Collector and Ground pins

available.

p OPTIMIZED FOR OFF-LINE AND DC-TO-DC

CONVERTERS.

p AUTOMATIC FEED FORWARD

COMPENSATION.

p PULSE-BY-PULSE CURRENT LIMITING.

p ENHANCED LOAD RESPONSE

CHARACTERISTICS.

p UNDER-VOLTAGE LOCKOUT WITH

HYSTERESIS.

p DOUBLE PULSE SUPPRESSION.

p HIGH-CURRENT TOTEM POLE OUTPUT.

p INTERNALLY TRIMMED BANDGAP

REFERENCE.

p 500KHz OPERATION.

PRODUCT HIGHLIGHT

p LOW R_OERROR AMPLIFIER.

COMPARISON OF UC384XA VS. SG384X DISCHARGE CURRENT

APPLICATIONS

UC384xA

■ ECONOMICAL OFF-LINE FLYBACK OR

SG384x

Min. Limit

Max. Limit

FORWARD CONVERTERS.

T_A=25°C

■ DC-DC BUCK OR BOOST CONVERTERS.

■ LOW COST DC MOTOR CONTROL.

A V A

O P

T I O N S

Part #

Start-Up Hysteresis Max. Duty

Voltage

16V

Cycle

<100%

<50%

UCx842A

0.8V

UCx843A 8.4V

UCx844A 16V

UCx845A 8.4V

7.5

7.8

−3σ

8.3

Mean

8.8

+3σ

9.3

0.8V

Discharge Current Distribution - mA

PACKAGE ORDER INFORMATION

Plastic DIP

8-pin

Plastic SOIC

8-pin

Plastic SOIC

14-pin

Ceramic DIP

8-pin

T_A(°C)

0 to 70

-40 to 85

-55 to 125

UC384xAM

UC284xAM

—

UC384xADM

UC284xADM

—

UC384xAD

UC284xAD

—

UC284xAY

UC184xAY

Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. UC3842ADMT)

F O R F U R T H E R I N F O R M AT I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1

Rev. 1.2 12/95

11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841

12 3 4 5 6 7 8

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与UC3844AY相关器件

型号	品牌	获取价格	描述	数据表
UC3844B	MOTOROLA	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3844B	ONSEMI	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3844B	STMICROELECTRONICS	获取价格	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
UC3844B	HGSEMI	获取价格	电流型脉宽调制器
UC3844B/D	MOTOROLA	获取价格	High Performance Current Mode Controller
UC3844B_12	ONSEMI	获取价格	High Performance Current Mode Controllers
UC3844BAC	ONSEMI	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3844BD	STMICROELECTRONICS	获取价格	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
UC3844BD	ONSEMI	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3844BD1	STMICROELECTRONICS	获取价格	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

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