UC1845A

更新时间： 2024-11-23 11:50:43

品牌	Logo	应用领域
美高森美 - MICROSEMI		控制器
页数	文件大小	规格书
8页	229K
描述
CURRENT MODE PWM CONTROLLER

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中文翻译

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替代型号

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UC1845A 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.

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

中文翻译

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UC1845A 替代型号

型号	品牌	替代类型	描述	数据表
UC3843AN	TI	功能相似	Current Mode PWM Controller

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UC1845AAY	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
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UC1845AJ	TI	获取价格	CURRENT MODE PWM CONTROLLER
UC1845AJ883B	TI	获取价格	CURRENT-MODE PWM CONTROLLER
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UC1845AL/883B	ROCHESTER	获取价格	Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, CQCC20
UC1845AL883B	TI	获取价格	CURRENT MODE PWM CONTROLLER
UC1845ALQMLV	TI	获取价格	CURRENT MODE PWM CONTROLLER
UC1845AMDREP	TI	获取价格	CURRENT-MODE PWM CONTROLLER

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