R1212D002A RICOH [RICOH electronics devices division], R1212D002A Datasheet - Page 10

• Manufacturer Part Number: R1212D002A
• Description: STEP-UP DC/DC CONTOLLER
• Manufacturer: RICOH [RICOH electronics devices division]

10
TYPICAL APPLICATIONS AND TECHNICAL NOTES
typical application above. Connect the capacitor as short as possible to the IC.
• In terms of the capacitor for setting delay time of the latch protection, C2 is shown in typical application above.
• Connect a 1µF or more value of capacitor between V
• Connect a capacitor between V
R1212D
Latch delay time depends on this C2 value. Refer to the Latch Protection Operation Timing Chart.
(Recommended value is from 10µF to 22µF.) If the operation of the composed DC/DC converter may be
unstable, use a tantalum type capacitor instead of ceramic type
The capacitance value of C6 is between 0.1µF and 1.0µF.
Use a 1µF or more capacitance value of bypass capacitor between V
Inductor
NMOS
Diode
C1
C2
C3
C4
C5
C1
C2
C6
R5
REFOUT
LDR655312T-100(TDK) [R1212DxxxA]
LDR655312T-4R7(TDK) [R1212DxxxB]
LDR655312T-220(TDK) [R1212DxxxC]
CPH6415 (Sanyo)
CRS02 (Toshiba)
1500pF[R1212DxxxC]
1500pF[R1212DxxxC]
1000pF[R1212DxxxA]
1000pF[R1212DxxxA]
and GND, C6 as shown in typical application of the previous page.
680pF[R1212DxxxB]
680pF[R1212DxxxB]
V
DELAY
GND
V
IN
REFOUT
Inductor
2.2µF
1.5µF
AMPOUT
1µF
DTC
EXT
V
FB
OUT
and GND, C3 as shown in typical application above.
C5
R6
NMOS
R4
Set V
Diode
C6
C7
R1
R2
R3
R4
R5
R6
C7
R3
C4
120k
IN
0.1µF
0.1µF
30k
5V
pin and GND, C1 as shown in the
Ω
Ω
R1
R2
V
OUT
180k
240k
300k
20k
4.7k
10V
1k
Ω
Ω
C3
Ω
Ω
Ω
Ω
140k
10k
15V
Ω
Ω