RT8238A
8
RT8238A-07 January 2014
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Copyright 2014 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Switching Frequency vs. Load Current
0
50
100
150
200
250
300
350
400
0.001
0.01
0.1
1
10
Load Current (A)
Sw
itchi
n
g Fr
equency (
kH
z)
1
V
IN
= 20V, V
OUT
= 1V
DEM Mode
CCM Mode
OVP
Time (200
μ
s/Div)
V
OUT
(500mV/Div)
V
IN
= 12V, V
OUT
= 1V, No Load
UGATE
(20V/Div)
LGATE
(5V/Div)
I
L
(10A/Div)
Time (20
μ
s/Div)
UVP
V
IN
= 12V, V
OUT
= 1V, No Load
V
OUT
(500mV/Div)
UGATE
(50V/Div)
LGATE
(10V/Div)
V
OUT
(500mV/Div)
Power On from EN
Time (1ms/Div)
CCM Mode, V
IN
= 12V, V
OUT
= 1V, No Load
UGATE
(20V/Div)
EN
(5V/Div)
PGOOD
(5V/Div)
Power On from EN
Time (1ms/Div)
V
OUT
(500mV/Div)
DEM Mode, V
IN
= 12V, V
OUT
= 1V, No Load
UGATE
(20V/Div)
EN
(5V/Div)
PGOOD
(5V/Div)
Load Transient Response
Time (20
μ
s/Div)
I
L
(10A/Div)
CCM Mode, V
IN
= 12V, V
OUT
= 1V
V
OUT
(50mV/Div)
UGATE
(20V/Div)
LGATE
(5V/Div)
