RH5RL37AC-RF datasheet(17/18 Pages) RICOH

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×5RL

TYPICAL APPLICATION

In R

×5RL Series, a constant voltage can be obtained

without using Capacitors C1 and C2. However, when the

wire connected to Vin is long, use Capacitor C1. Output

noise can be reduced by using Capacitor C2.

Insert Capacitors C1 and C2 with the capacitance of

0.1µF to 2.0µF between Input/Output Pins and GND Pin

with minimum wiring.

As shown in the circuit diagram, a dual power sup-

ply circuit can be constructed by using two R

×5RL

Series.

This circuit diagram shows a dual power supply

circuit with an output of 3V and an output of 5V.

When the minimum output current of IC2 is larger

than ISS of IC1, Resistor R is unnecessary. Diode D is

a protection diode for the case where VOUT2 becomes

larger than VOUT1.

• VOLTAGE BOOST CIRCUIT

• DUAL POWER SUPPLY CIRCUIT

VIN

GND

×5RL

SERIES

VOUT

VIN

GND

×5RL

SERIES

VOUT

VIN

ISS

VIN

GND

×5RL20A

×5RL30A

VOUT

VOUT1

VOUT2

VIN

GND

VOUT

VIN

ISS

IC1

IC2

The output voltage can be obtained by the follow-

ing formula :

VOUT=Vreg · (1+R2/R1) + ISS R · 2

Since the quiescent current of R

×5RE Series is so

small that the resistances of R1 and R2 can be set as

large as several hundreds k

Ω and therefore the sup-

ply current of “Voltage Boost Circuit” itself can be

reduced.

Furthermore, since R

×5RL Series are operated by

a constant voltage, the supply current of “Voltage

Boost Circuit” is not substantially affected by the

input voltage.

*1) Vreg : Set Output Voltage of R×5RL Series.

APPLICATION CIRCUITS

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