APW1172
Typical Operating Characteristics (Cont.)
Switching Frequency
258
256
254
252
250
248
246
244
-50
-25
0
25
50
75
100
125
JunctionTemperature (oC)
Operating waveforms
1. Power ON (no SS) :
2. Power ON (external SS) :
- VIN = 12V,VOUT = 3.3V
- VIN = 12V,VOUT = 3.3V
- CIN = 22mF, COUT = 220mF, L = 15 mH
- CIN = 22mF, COUT = 220mF, L = 15 mH
IL
IL
VIN
VIN
VOUT
VOUT
COMP
COMP
Ch1 : VOUT,1V/div
Ch2 : COMP,2V/div
Ch3 : VIN,5V/div
Ch4 : IL,2A/div
Ch1 : VOUT,1V/div
Ch2 : COMP,2V/div
Ch3 : VIN,5V/div
Ch4 : IL,2A/div
Time : 1ms/div
Time : 400us/div
Copyright ã ANPEC Electronics Corp.
10
www.anpec.com.tw
Rev. A.4 - Aug., 2005
ANPEC [ ANPEC ELECTRONICS COROPRATION ]
