R1211X Datasheet, PDF (15/33 Pages) RICOH electronics devices division – Step-up DC/DC Controller

*DELAY Pin Detector Threshold Voltage Test
3.3V
VIN _EXT
V FB
OSCILLOSC OPE
GND DELAY
*AMP “H” Output Current/”L” Output Current Test
3.3V
VIN
AMPOUT
A
1V
V FB
GND DELAY
*UVLO Detector Threshold/Hysteresis Range Test
VIN _EXT
OSCILLOSC OPE
V FB
GND DELAY
*Soft-start Time Test
Coil
Diode
C5
C3
VIN
EXT
AMPOUT
C4
V FB
GND
DELAY
NMOS
C1
R4
R3
V OUT
C2
Rout
R1
R2
OSCILLOSCOPE
<Components>
Inductor (L)
: 22µH (TDK LDR655312T-220)
Diode (SD)
: CRS02 (Toshiba)
Capacitors
C1: 680pF(Ceramic), C2: 22µF (Tantalum)+2.2µF (Ceramic),
C3: 68µF (Tantalum)+2.2µF (Ceramic), C4: 2200pF(Ceramic), C5: 22µF(Tantalum)
NMOS Transistor : IRF7601 (International Rectifier)
Resistors
: R1: 90kΩ, R2:10kΩ, R3:30kΩ, R4:30kΩ, Rout:1kΩ/330Ω
Rev. 1.10
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