Datasheet > KA3842

KA3842

更新时间： 2024-11-24 03:47:19

品牌	Logo	应用领域
伊泰克 - ESTEK		控制器
页数	文件大小	规格书
7页	321K
描述
fixed frequency current mode PWM controller

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中文翻译

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数据手册

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KA3842 数据手册

Description

The 3842A(AM)/43A(AM)/44A(AM)/45A(AM) 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 3842A(AM) and 3844A(AM) have UVLO thresholds of 16 V (on) and 10 V (off). The corresponding

thresholds for the 3843A(AM)/45A(AM) are 8.4V (on) and 7.6V (off). The MIK3842A(AM) and MIK3843A(AM) can operate within 100% duty

cycle. The 3844A(AM) and UC3845A(AM) can operate within 50% duty cycle.

The 384XA(AM) has Start-Up Current 0.17mA (typ).

Features

Pin Connection

•

Low Start-Up and Operating Current

High Current Totem Pole Output

Undervoltage Lockout With Hysteresis

Operating Frequency Up To 300KHz (384XA)

500KHz (384XAM

)

Top view

Block diagram

(toggle flip flop used only in MIK3844, MIK3845)

36V

GND

SET

REF

UVLO

GOOD

LOGI

RNAL

BIAS

POWER

1/2 V

REF

COM

LA CH

CUR

RENT

SEN

OSCILLATOR

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.)

BEIJING ESTEK ELECTRONICS CO.,LTD

12 3 4 5 6 7

中文翻译

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与KA3842相关器件

型号	品牌	获取价格	描述	数据表
KA3842A	Wing Shing	获取价格	Linear Integrated Circuit(CURRENT-MODE PWM CONTROLLER)
KA3842AC	FAIRCHILD	获取价格	SMPS Controller
KA3842AC_06	FAIRCHILD	获取价格	SMPS Controller
KA3842ACS	ROCHESTER	获取价格	1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDIP8, LEAD FREE, DIP-8
KA3842ACS	FAIRCHILD	获取价格	Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDIP8, LEAD FR
KA3842AE	FAIRCHILD	获取价格	SMPS Controller
KA3842AM	Wing Shing	获取价格	Linear Integrated Circuit(CURRENT-MODE PWM CONTROLLER)
KA3842AMM	Wing Shing	获取价格	Linear Integrated Circuit(CURRENT-MODE PWM CONTROLLER)
KA3842AMN	Wing Shing	获取价格	Linear Integrated Circuit(CURRENT-MODE PWM CONTROLLER)
KA3842AN	Wing Shing	获取价格	Linear Integrated Circuit(CURRENT-MODE PWM CONTROLLER)