Datasheet > UC1845A

UC1845A

更新时间： 2024-11-24 14:53:51

品牌	Logo	应用领域
美国微芯 - MICROCHIP		/
页数	文件大小	规格书
8页	381K
描述
Control ICs provides all the necessary features to implement off-line fixed-frequency, current-mod

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UC1845A 数据手册

UC184xA / 284xA / 384xA

CURRENT

MODE PWM CONTROLLER

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

H E

N F I N I T E

O W E R O F

I N N O V A T I O N

KEY FEATURES

DESCRIPTION

The UC184xA family of control ICs provides externally programmable oscillator to set

all the necessary features to implement off-line frequency and maximum duty cycle. The

fixed-frequency, current-mode switching power undervoltage lock-out is designed to operate with

LOW START-UP CURRENT.

(0.5mA max.)

TRIMMED OSCILLATOR

DISCHARGE CURRENT. (See

Product Highlight)

OPTIMIZED FOR OFF-LINE

AND DC-TO-DC

CONVERTERS.

AUTOMATIC FEED FORWARD

COMPENSATION.

PULSE-BY-PULSE CURRENT

LIMITING.

ENHANCED LOAD RESPONSE

CHARACTERISTICS.

UNDER-VOLTAGE LOCKOUT

WITH HYSTERESIS.

DOUBLE PULSE

SUPPRESSION.

HIGH-CURRENT TOTEM POLE

OUTPUT.

INTERNALLY TRIMMED

BANDGAP REFERENCE.

500KHz OPERATION.

LOW RO ERROR AMPLIFIER.

supplies with

minimum of external 250µA typ. start-up current, allowing an efficient

components. The current mode architecture bootstrap supply voltage design. Available

demonstrates improved load regulation, pulse- options for this family of products, such as start-

by-pulse current limiting and inherent protection up voltage hysteresis and duty cycle, are

of the power supply output switch. The IC summarized below in the Available Options

includes: A bandgap reference trimmed to ±1% section. The UC184xA family of control ICs is

accuracy, an error amplifier, a current sense also available in 14-pin SOIC package which

comparator with internal clamp to 1V, a high makes the Power Output Stage Collector and

current totem pole output stage for fast Ground pins available.

switching of power MOSFET's, and an

IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com

PRODUCT HIGHLIGHT

COMPARISON OF UC384

VS. SG384

ISCHARGE URRENT

UC384xA

SG384x

Min. Limit

SG384x

Max. Limit

T =25 C

KEY FEATURES

ECONOMICAL OFF-LINE

FLYBACK OR FORWARD

CONVERTERS.

DC-DC BUCK OR BOOST

CONVERTERS.

LOW COST DC MOTOR

CONTROL.

7.5

7.8

-3s

8.3

Mean

8.8

+3s

9.3

Available Options

Start-Up

Max. Duty

Cycle

Part#

Hysteresis

Voltage

UCx842A

UCx843A

UCx844A

UCx845A

16V

8.4V

16V

0.8V

<100%

<50%

Discharge Current Distribution - mA

8.4A

0.8V

<50%

PACKAGE ORDER INFO

Plastic DIP

8-Pin

Plastic SOIC

8-Pin

Plastic SOIC

14-Pin

Ceramic DIP

8-Pin

T_A(°C)

RoHS Compliant / Pb-free

Transition DC: 0503

RoHS Compliant / Pb-free Transition DC: 0440

0 to 70

-40 to +85

-55 to 125

UC384xAM

UC284xAM

UC384xADM

UC284xADm

UC384xAD

UC284xAD

UC284xAY

UC184xAY

Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. UC3842ADM-TR)

I N

I N I T Y

I C R O E L E C T R O N I C S

I N C .

Rev. 1.2a,2005-03-09

11861 WESTERN

VENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570

12 3 4 5 6 7 8

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与UC1845A相关器件

型号	品牌	获取价格	描述	数据表
UC1845AAY	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
UC1845A-EP	TI	获取价格	CURRENT-MODE PWM CONTROLLER
UC1845AJ	TI	获取价格	CURRENT MODE PWM CONTROLLER
UC1845AJ883B	TI	获取价格	CURRENT-MODE PWM CONTROLLER
UC1845AJQMLV	TI	获取价格	CURRENT MODE PWM CONTROLLER
UC1845AL	TI	获取价格	CURRENT MODE PWM CONTROLLER
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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