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KA3842A

Wing Shing Computer Components
Part Number KA3842A
Manufacturer Wing Shing Computer Components
Description PWM CONTROLLER
Published Apr 25, 2005
Detailed Description Linear Integrated Circuit CURRENT−MODE PWM CONTROLLER The KA3842A KA3842AM are fixe frequency current-mode PWM controlle...
Datasheet PDF File KA3842A PDF File

KA3842A
KA3842A

Overview
Linear Integrated Circuit CURRENT−MODE PWM CONTROLLER The KA3842A KA3842AM are fixe frequency current-mode PWM controller.
They are specially designed for OFF−Line and DC−to−DC converter applications with minimal external components.
These integrated circuits feature 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 circuity includes built under−voltage lockout and current limiting.
The KA3842A,KA3842AM have UVLO thresholds of 16 V(on) and 10 V (off).
The KA3842A ,KA384AM can operate within 100% duty cycle The KA3842A has been proven in applications using the same external components as Motorola's parts,among others .
The KA3842AM has been optimized for compatibility with Samsung's parts Many applications can use either The KA3842A KA3842AM have Start-Up Current 0,45 mA KA3842A or KA3842AM KA3842A KA3842AM PIN CONNECTION FEATURES • • • • Low Start-Up Current Maximum Duty Cycle U/V Lockout With Hysteresis Operating Freguency Up To 500khz SO-8 DIP-8 ordering information Device KA3842AM KA3842AMM KA3842AN KA3842AMN Package SO-8 SO-8 DIP-8 DIP-8 Operating temperature 0 to +700C " " " BLOCK DIAGRAM Absolute Maximum Ratings Characteristic Supply Voltage Output Current Analog Inputs Error Amp Output Sink Current Power Dissipation (TA=250C) Symbol VCC IO VI ISINK (E.
A) PO Value 30 ±1 −0.
3 to VCC 10 1 Unit V A V mA W Wing Shing Computer Components Co.
, (H.
K.
)Ltd.
Homepage: http://www.
wingshing.
com Tel:(852)2341 9276 Fax:(852)2797 8153 E-mail: wsccltd@hkstar.
com 1 KA3842A/KA3842AM Electrical characteristics (*VCC=15V, RT=10kΩ , CT=3.
3nF, TA=00C to +700C, unless otherwise specified) Characteristics Reference Section Reference Output Voltege Line Regulation Load Regulation Short Circit Output Current Oscillator Section Oscillation Freguency Frequency Change with Voltage Oscillator Amplitu...


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