APW7301
Operating Waveforms
The test condition is VIN=12V, TA= 25oC unless otherwise specified.
Normal Operation in Heavy
Load
Current Limit & Frequency
Foldback
VOUT
VOUT
VLX
1
VLX
1
3
2
IL
IL
2
3
VIN =12V, VOUT =3.3V, COUT =22uF,L =10uH,
IOUT =3A
VIN =12V, VOUT =3.3V, COUT =22uF,L =10uH,
Ramp up IOUT into current limit
CH1: VOUT, 2V/Div, DC
CH2: IL, 2A/Div, DC
CH1: VEN, 5V/Div, DC
CH2: VLX, 10V/Div, DC
CH3: VLX, 10V/Div, DC
CH3: IL, 2A/Div, DC
TIME: 2ms/Div
TIME: 50ms/Div
Normal Operation in Light
Load
Load Transient
VOUT
VLX
VOUT
1
1
3
IOUT
IL
2
2
VIN =12V, VOUT =3.3V, COUT =22uF,L =10uH,
IOUT =100mA
VIN =12V, VOUT =3.3V, COUT =22uF,L =10uH,
COMP=6.8kΩ+3.9nF,IOUT =300mA-3A-300mA
CH1: VOUT, 2V/Div, DC
CH2: IL, 1A/Div, DC
CH1: VOUT, 0.5V/Div, offset=3.3V
CH2: IOUT, 2A/Div, DC
CH3: VLX, 10V/Div, DC
TIME: 50ms/Div
TIME: 5ms/Div
Copyright ã ANPEC Electronics Corp.
8
www.anpec.com.tw
Rev. A.2 - Apr., 2013
ANPEC [ ANPEC ELECTRONICS COROPRATION ]
