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RP108J301D-T1-FE Datasheet(PDF) 8 Page - RICOH electronics devices division

Part # RP108J301D-T1-FE
Description  Output Current Min. 3A
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Manufacturer  RICOH [RICOH electronics devices division]
Direct Link  http://www.ricoh.com
Logo RICOH - RICOH electronics devices division

RP108J301D-T1-FE Datasheet(HTML) 8 Page - RICOH electronics devices division

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RP108J
NO.EA-203-150817
8
TECHNICAL NOTES
When using the RP108J as an internally fixed output voltage type, please connect the VOUT pin to the VFB pin.
However, when using it as the Adjustable Output Voltage Type, The output voltage of the externally adjustable
output voltage type should be set to 4.2V or less. Also, total resistors value of R1 and R2 should be 20k
Ω or less.
Phase Compensation
In the IC, phase compensation is made for securing stable operation even if the load current is varied. For this
purpose, use a 10
μF or more capacitor C2.
In case of using a tantalum capacitor and its ESR is large, the output may be unstable. Therefore, select C2
carefully considering its frequency characteristics.
The recommended temperature characteristics for C1 and C2 capacitors are the followings.
B Characteristics: Temperature range from −25°C to 85°C, Capacitance change of ±10%
X5R Characteristics: Temperature range from −55°C to 85°C, Capacitance change of ±15%
X7R Characteristics: Temperature range from −55°C to 125°C, Capacitance change of ±15%
The recommended capacitor’s tolerable voltage is twice as large as the voltage of use (C1: Input voltage,
C2: Output voltage). The upper limit of the capacitance value for C2 is 100
µF.
However, the increase of C2 leads to the increase of inrush current. Refer to CONSTANT SLOPE CIRCUIT for
detailed information.
PCB Layout
Make VDD and GND lines sufficient. If their impedance is high, noise pickup or unstable operation may result.
Connect a capacitor C1 with a capacitance value as much as 10
μF or more between VDD and GND pin, and
as close as possible to the pins.
Set external components, especially the output capacitor C2, as close as possible to the ICs and make wiring
as short as possible.
Transient Response
When using the Adjustable Output Voltage Type, the transient response could be affected by the external
resistors. Evaluate the circuit taking the actual conditions of use into account.


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