Datasheet > UC3845A-BW

UC3845A-BW

更新时间： 2024-11-23 12:28:07

品牌	Logo	应用领域
戈采 - FCI		控制器
页数	文件大小	规格书
10页	2097K
描述
Current Mode PWM Controller Low Start-Up and Operating Current

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中文翻译

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数据手册

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UC3845A-BW 数据手册

UC384XA-BW Current Mode PWM Controller

(UC3842A-BW/43A-BW/44A-BW/45A-BW)

DESCRIPTION

CONNECTION

The UC3842A-BW/43A-BW/44A-BW/45A-BW 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

(TOP VIEW)

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 UC3842A-BW and UC3844A-BW have UVLO thresholds of 16 V (on) and 10 V (off). The

corresponding thresholds for the UC3843A-BW/45A-BW are 8.4V (on) and

7.6V (off).

The UC3842A-BW and UC3843A-BW can operate within 100% duty cycle. The UC3844A-BW

and UC3845A-BW can operate within 50% duty cycle.

The UC384XA-BW has Start-Up Current 0.17mA (typ).

The UC384XA-BW are revised UC384XAM and differ by higher Unity Gain bandwidth of Error Amplifier.

FEATURES

•

Low Start-Up and Operating Current

High Current Totem Pole Output

Undervoltage Lockout With Hysteresis

Operating Frequency Up To 500KHz

BLOCK DIAGRAM

(toggle flip flop used only in UC3844, UC3845)

Absolute Maximum Ratings

Characteristic

Symbol

Value

Unit

Supply Voltage (low impedance

source)

V_CC

Output Current

I_O

V_I

±1

−0.3 to 5.5

Input Voltage (Analog Inputs pins 2,3)

Error Amp Output Sink Current

Power Dissipation (T_A=25⁰C)

Storage Temperature Range

Lead Temperature (soldering 5 sec.)

I_{SINK (E.A)}

P_O

^oC

Tstg

T_L

-65 to150

260

12 3 4 5 6 7...10

中文翻译

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