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APW1172KAI-TRL 参数 Datasheet PDF下载

APW1172KAI-TRL图片预览
型号: APW1172KAI-TRL
PDF下载: 下载PDF文件 查看货源
内容描述: 2.5A开关降压开关稳压器 [2.5A SWITCH STEP DOWN SWITCHING REGULATOR]
分类和应用: 稳压器开关
文件页数/大小: 21 页 / 443 K
品牌: ANPEC [ ANPEC ELECTRONICS COROPRATION ]
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APW1172  
Operating waveforms (Cont.)  
3. Current Limit :  
4. Load Transient :  
- VIN = 12V,VOUT = 3.3V  
- VIN = 12V,VOUT = 3.3V  
- CIN = 22mF, COUT = 220mF, L = 15 mH  
- CIN = 22mF, COUT = 220mF, L = 15 mH  
IOUT  
IOUT  
V OUT  
VOUT  
COMP  
Ch1 : VOUT,2V/div  
Ch2 : COMP,2V/div  
Ch3 : IOUT,2A/div  
Time : 2ms/div  
Ch1 : VOUT,200mV/div,offset 3.3V  
Ch2 : IOUT,1A/div,100mA-3A  
Ch2 rising time : 4us  
Ch2 falling time : 4us  
Time : 10us/div  
Functional Description  
Power-On-Reset  
comparatorandcomparedwithinternalsawtoothwave.  
It generates a PWM control signal by the PWM  
comparator. ThePWM signal feedsintothelogic circuit  
and turns on or off the pass element. The Buck type  
output stage regulates the correct output voltage  
depends on the previous mechanism.  
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  
thresholdvoltage after powering on.  
Output Voltage Regulation  
Current Limit  
Anerror amplifierworkingwithatemperature-compen-  
sated 1.235V reference. The error amplifier designed  
with high bandwidth and DC gain provides very fast  
transient response and lessload 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  
The APW1172 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  
Copyright ã ANPEC Electronics Corp.  
11  
www.anpec.com.tw  
Rev. A.4 - Aug., 2005