Datasheet > UC2845B

UC2845B

更新时间： 2024-11-24 17:14:59

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
9页	877K
描述
AC-DC控制器和稳压器

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中文翻译

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数据手册

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UC2845B 数据手册

UMW

UMW UC2842/43/44/45

Description

The 2842/43/44/45 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 preci-

se 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 2842 and 2844 have UVLO thresholds of 16V (on) and 10V (off). The corresponding thresholds for the

2843/ 45 are 8.4V (on) and 7.6V (off). The 2842 and 2843 can operate within 100% duty cycle.

The 2844 and 2845 can operate within 50% duty cycle.

The 284X has Start-Up Current 0.5mA (typ).

Pin Connection

Features

•

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 2844, 2845)

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

-25 to +85

www.umw-ic.com

友台半导体有限公司

12 3 4 5 6 7...9

中文翻译

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