Datasheet > UC3845AD8

UC3845AD8

更新时间： 2024-09-26 20:27:19

品牌	Logo	应用领域
FCI-CONNECTOR		/
页数	文件大小	规格书
6页	252K
描述
Switching Regulator/Controller

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数据手册

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UC3845AD8 数据手册

UC3845A High Performance

Current Mode Controller

The UC3845A series of high performance

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 for 50%

to 70%.

This device is available in an 8–pin dual–in–

line plastic package as well as the 14–pin plastic sur-

face mount (SOP–14). The SOP–14 package has sepa-

rate power and ground pins for the totem pole output

stage.

fixed frequency current mode controllers are

specifically designed for off–line and dc–to–dc

converter applications offering the designer a cost

effective solution with minimal external components.

This integrated circuit features 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.

The UC3845A is designedfor lower voltage

applications having UVLO thresholds of 8.5V (on)

and 7.6V (off).

Also included are protective features

consisting of input and reference undervoltage lockouts

each with hysteresis, cycle–by–cycle current limiting,

Output Deadtime Adjustable from 50% to 70%

Current Mode Operation to 500 kHz

Automatic Feed Forward Compensation

Latching PWM for Cycle–By–Cycle Current Limiting

Internally Trimmed Reference with Undervoltage Lockout

High Current Totem Pole Output

CDSUFFIX

PLASTIC PACKAGE

8 DIP

D8SUFFIX

PLASTIC PACKAGE

8 SOP

Undervoltage Lockout with Hysteresis

Low Startup and Operating Current

CSSUFFIX

PLASTIC PACKAGE

SOP-14

SIMPLIFIEDBLOCKDIAGRAM

PINCONNECTIONS

Pin numbers adjacent to terminals are for the D suffix 8-DIP package.

Pin numbers in parenthesis are for the S suffix SOP–14 package.

NOTES: 1. Maximum Package power dissipation limits must be observed.

2. Adjust V_CCabove the Startup threshold before setting to 15 V.

3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible

T_low= 0°C, T_high= +70°C.

4. This parameter is measured at the latch trip point with V_FB= 0V.

∆V Output Compensation

∆V Current Sense Input

5. Comparator gain is defined as: A_V

4-30

12 3 4 5 6

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与UC3845AD8相关器件

型号	品牌	获取价格	描述	数据表
UC3845AD8G4	TI	获取价格	具有 8.4V/7.6V UVLO 50% 占空比、温度范围为 0°C 至 70°C 的
UC3845AD8TR	TI	获取价格	Current Mode PWM Controller
UC3845AD8TRG4	TI	获取价格	具有 8.4V/7.6V UVLO 50% 占空比、温度范围为 0°C 至 70°C 的
UC3845ADG4	TI	获取价格	具有 8.4V/7.6V UVLO 50% 占空比、温度范围为 0°C 至 70°C 的
UC3845ADM	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
UC3845ADMT	ETC	获取价格	Current-Mode SMPS Controller
UC3845ADM-TR	MICROSEMI	获取价格	Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO8, ROHS CO
UC3845ADT	ETC	获取价格	Current-Mode SMPS Controller
UC3845ADTR	TI	获取价格	Current Mode PWM Controller
UC3845AD-TR	MICROSEMI	获取价格	Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO14, ROHS C