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KA3843A

Wing Shing
Part Number KA3843A
Manufacturer Wing Shing
Description Current Mode PWM Controller
Published Nov 1, 2007
Detailed Description www.DataSheet4U.com Current Mode PWM Controller KA3843A(AM) DESCRIPTION The KA3843AM are fixed frequency current mode ...
Datasheet PDF File KA3843A PDF File

KA3843A
KA3843A

Overview
www.
DataSheet4U.
com Current Mode PWM Controller KA3843A(AM) DESCRIPTION The KA3843AM 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 corresponding thresholds for the The KA3843AM are 8.
4V(on) and 7.
6V (off) The KA3843AM can operate within 100% duty cycle.
PIN CONNECTION (TOP VIEW) The KA3843AM has Start-Up Current 0.
17mA (typ).
FEATURES • • • • Low Start-Up and Operating Current High Current Totem Pole Output Undervoltage Lockout With Hysteresis Operating Frequency Up To 500KHz BLOCK DIAGRAM Absolute Maximum Ratings Characteristic Supply Voltage (low impedance source) Output Current Input Voltage (Analog Inputs pins 2,3) Error Amp Output Sink Current Power Dissipation (TA=250C) Storage Temperature Range Lead Temperature (soldering 5 sec.
) Symbol VCC IO VI ISINK (E.
A) PO Tstg TL Value 30 ±1 −0.
3 to 5.
5 10 1 -65 to150 260 Unit V A V mA W oC oC 1 www.
DataSheet4U.
com Current Mode PWM Controller KA3843A(AM) Electrical characteristics (*VCC=15V, RT=10kΩ, CT=3.
3nF, TA=00C to +700C, unless otherwise specified) Characteristics Symbol Test Condition Min Typ Max Reference Section Reference Output Voltage Line Regulation Load Regulation Short Circuit Output Current Oscillator Section Oscillation Frequency Frequency Change with Voltage Oscillator Amplitude Error Amplifier Section Input Bias Current Input Voltage Open Loop Voltage Gain Power Supply Rejection Ratio Output Sink Current Output Source Current High Output Voltage Low Output Voltage Current Sense Section Gain Maximum Input Signal Supply Voltage Rejection ...


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