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AP3845N8L Datasheet(PDF) 5 Page - Anachip Corp |
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AP3845N8L Datasheet(HTML) 5 Page - Anachip Corp |
5 / 8 page High Performance Current Mode PWM Controller AP3842/3/4/5 Anachip Corp. www.anachip.com.tw Rev.1.0 Oct.11, 2004 5/8 Peak current(is) is determined by the formula 1.0V IS max ≈ RS A small RC filter may be required to suppress switch transients. Figure 4. 5 4 8 R T C T V REF R T/CT GROUND for R T > 5KΩ f= 1.72 R TCT Figure 5 : Open Loop Test Circuit. 1 2 3 4 5 6 7 8 COMP. VFB VREF ISENSE RT/CT OUTPUT GROUND Vi AP3842 A GROUND OUTPUT Vi VREF TW 1K 0.1 uF 0.1 uF CT 5K 4.7K 4.7K 1K 100K ISENSE ADJUST ERROR AMP. ADJUST RT 2N2222 High peak currents associated with capacitive loads necessitate careful grounding techniques. Timing and bypass apacitors should be connected close to pin 5 in a single point ground. The transistor and 5 KΩ potentiometer are used to sample the oscillator waveform and apply an adjustable ramp to pin 3. Figure 6 : Shutdown Techniques. 3 B 1 COMP SHUTDOWN TO CURRENT SENSE RESISTOR VREF ISENSE 1K 500K 330K SHUTDOWN |
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