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UC3843A Datasheet(PDF) 5 Page - Unisonic Technologies |
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UC3843A Datasheet(HTML) 5 Page - Unisonic Technologies |
5 / 9 page UC3842A/3843A LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 5 of 9 www.unisonic.com.tw QW-R103-002,D OPEN-LOOP LABORATORY TEST FIXTURE 1 2 8 7 3 6 4 5 A VREF Vcc 1k Ω / 1W CT RT 5k Ω Error Amp Adjust OUTPUT High peak current associated with capacity loads necessitate careful grounding techniques. Timing and bypass capacitors should be connected close to pin 5 in single point GND. The transistor and 5k Ω potentio-meter are used to sample the oscillator waveform and apply an adjustable Ramp to Pin 3. UNDER-VOLTAGE LOCKOUT 7 Vcc Von=16V Voff=10V ON/OFF Command to rest of IC Von Voff <1mA <15mA Icc Vcc During Under-Voltage Lockout, the output driver is biased to a high impedance state. Pin 6 should be shunt to GND with a bleeder resistor to prevent activating the power switch with output leakage currents. ERROR AMPLIFIER CONFIGURATION 2 1 0.5mA 2.5V Zf Zi Error amplifier can source or sink up to 0.5mA |
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