Datasheet > UC3843B

UC3843B

更新时间： 2024-11-24 17:15:23

品牌	Logo	应用领域
友台半导体 - UMW		控制器稳压器
页数	文件大小	规格书
7页	822K
描述
AC-DC控制器和稳压器

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数据手册

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UC3843B 数据手册

UMW

UMW UC3842/43/44/45

Description

The 3842/43/44/45 are fixed frequency current mode PWM controller. They are specially designed for OFF−Line and DC to

DC converter applications with a minimal external components. Internally implemented circuits include a trimmed oscillator for precise

duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator, and a high current

totempole output ideally suited for driving a power MOSFET. Protection circuitry includes built undervoltage lockout and current

limiting. The 3842 and 3844 have UVLO thresholds of 16 V (on) and 10 V (off). The corresponding thresholds for the 3843/

45 are 8.4V (on) and 7.6V (off). The 3842) and 3843 can operate within 100% duty cycle. The 3844 and 3845 can operate within 50% duty

cycle.

The 384X has Start-Up Current 0.5mA (typ).

Features

Pin Connection

•

Low Start-Up and Operating Current

High Current Totem Pole Output

Undervoltage Lockout With Hysteresis

Operating Frequency Up To 500KHz

Top view

Block diagram

(toggle flip flop used only in 3844, 3845)

Absolute Maximum Ratings

Symbol

Parameter

Maximum

Units

V_CC

I_O

Supply Voltage (low impedance source)

±1

Output Current

V_I

I_{SINK (E.A)}

Input Voltage (Analog Inputs pins 2,3)

Error Amp Output Sink Current

Power Dissipation (T_A=25⁰C)

Storage Temperature Range

−

0.3 to 5.5

Tstg

-65 to150

260

^oC

T_L

Lead Temperature (soldering 5 sec.)

^oC

Operating Ambient Temperature

0 to 70

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