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APW1173KAI-TR Datasheet(PDF) 11 Page - Anpec Electronics Coropration |
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APW1173KAI-TR Datasheet(HTML) 11 Page - Anpec Electronics Coropration |
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11 / 21 page  Copyright © ANPEC Electronics Corp. Rev. A.5 - Aug., 2005 APW1173 www.anpec.com.tw 11 Ch1 : VOUT,200mV/div,offset 3.3V Ch2 : IOUT,1A/div,100mA-3A Ch2 rising time : 4us Ch2 falling time : 4us Time : 10us/div Ch1 : VOUT,2V/div Ch2 : COMP,2V/div Ch3 : IOUT,2A/div Time : 2ms/div 4. Load Transient : - VIN = 12V,VOUT = 3.3V - CIN = 22 µF, COUT = 220µF, L = 15 µH 3. Current Limit : - VIN = 12V,VOUT = 3.3V - CIN = 22 µF, COUT = 220µF, L = 15 µH IOUT VOUT IOUT VOUT Operating waveforms (Cont.) Functional Description Power-On-Reset A Power-On-Reset circuit monitors input voltages at VCC pin to prevent wrong logic controls. The POR function initiates immediately by the inductor current with it’s limit after the supply voltage exceed firstly it’s threshold voltage after powering on. Output Voltage Regulation An error amplifier working with a temperature-compen- sated 1.235V reference. The error amplifier designed with high bandwidth and DC gain provides very fast transient response and less load regulation. It compares the reference with the feedback voltage and amplifies the difference in it’s output called error signal. The error signal feeds into the input terminal of PWM comparator and compared with internal saw tooth wave. It generates a PWM control signal by the PWM comparator. The PWM signal feeds into the logic circuit and turns on or off the pass element. The Buck type output stage regulates the correct output voltage depends on the previous mechanism. Current Limit The APW1173 monitors the current flow through the pass element and limits the maximum output current to prevent damages during overload or short-circuit conditions. Over-Voltage Protection (OVP) The over voltage protection is realized by using an COMP COMP V OUT V OUT IOUT IOUT |
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