R1225N Datasheet, PDF (13/31 Pages) RICOH electronics devices division – PWM/VFM step-down DC/DC Converter

R1225N
TEST CIRCUITS
A) Output Voltage, Oscillator Frequency, CE “H” Input Voltage, CE “L” Input Voltage, Soft-start time
L1
PMOS
Oscilloscope
D1
V
+
-
C1
EXT
GND
VOUT
VIN
DLY
CE
+
-
C2
B) Supply Current 1
C) Standby Current
EXT
GND
VOUT
VIN
A
DLY
CE
EXT
GND
VOUT
VIN
A
DLY
CE
D) EXT “H” Output Current
EXT
VIN
A
GND
DLY
VOUT
CE
E) EXT “L” Output Current
EXT
A
GND
VOUT
VIN
DLY
CE
F) DLY Switch Current
EXT
GND
VOUT
VIN
DLY A
CE
13