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UC3842BP-D08-T Datasheet(PDF) 6 Page - Unisonic Technologies |
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UC3842BP-D08-T Datasheet(HTML) 6 Page - Unisonic Technologies |
6 / 11 page UC3842B/3843B LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 6 of 11 www.unisonic.com.tw QW-R103-012.D TYPICAL APPLICATION CIRCUIT Open Loop Test Circuit All of the parameters are not all tested in production, although been guaranteed. The timing and bypass capacitors must be connected to pin 5 in a single point ground very closely. To sample the oscillator waveform, the transistor and 5kΩ potentiometer are used, and also can apply an adjustable ramp to ISENSE pin. 1 2 3 4 8 7 6 5 UTC UC3842B/3843B COMP VFB ISENSE RT/CT GND OUTPUT VC VREF A E/A ADJUST 1K 4.7K ISENSE ADJUST 5K 4.7K 2N 2222 RT 100K CT 0.1 0.1 OUTPUT 1K/1W V1 VREF Under Voltage Lockout Under-Voltage Lock-Out: the output driver is biased to a high impedance state. To prevent activating the power switch with output leakage current, pin 6 should be shunted to ground with a bleeder resistor. Error Amp Configuration |
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