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KA3842 Datasheet(PDF) 1 Page - Estek Electronics Co. Ltd |
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KA3842 Datasheet(HTML) 1 Page - Estek Electronics Co. Ltd |
1 / 7 page 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 • Low Start-Up and Operating Current • High Current Totem Pole Output • Undervoltage Lockout With Hysteresis •Operating Frequency Up To 300KHz (384XA) 500KHz (384XAM ) Pin Connection Block diagram (toggle flip flop used only in MIK3844, MIK3845) Top view 7 8 V 5V VREF SET/ RESET UVLO 36V GND 5 2 1 VFB COMP INTERNAL BIAS 1/2 VREF + ERR VRE GOOD F LOGIC 2R C.S. COMP 1V R R PWM LATCH POWER VCC 7 OUT 6 3 CURRENT SENSE R /C T OSCILLATOR S T 5 POWER GND Absolute Maximum Ratings Symbol Parameter Maximum Units VCC Supply Voltage (low impedance source) 30 V IO Output Current ±1 A VI Input Voltage (Analog Inputs pins 2,3) −0.3 to 5.5 V ISINK (E.A) Error Amp Output Sink Current 10 mA Po Power Dissipation (TA=25 0C) 1 W W Tstg Storage Temperature Range -65 to150 oC oC TL Lead Temperature (soldering 5 sec.) 260 1 BEIJING ESTEK ELECTRONICS CO.,LTD |
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