RH5RL37AC-RF datasheet(18/18 Pages) RICOH

18 / 18 page

×5RL

• CURRENT BOOST CIRCUIT

Output current of 60mA or more can be obtained by

the current boost circuit constructed as shown in this cir-

cuit diagram.

• CURRENT BOOST CIRCUIT WITH OVERCURRENT LIMIT CIRCUIT

A circuit for protecting Tr.1 from the destruction

caused by output short-circuit or overcurrent is shown in

this circuit diagram.

When the voltage reduction caused by the current ( aa

IOUT) which flows through R2 reaches Vbe2 of Tr.2 by

additionally providing the current boost circuit with Tr.2

and R2, Tr.2 is turned ON and the base current of Tr.1 is

increased, so that the output current is limited.

Current limit of Overcurrent Limit Circuit is obtained

as follows :

IOUT

Vbe2/R2

• CURRENT SOURCE

A current source with the structure as shown in this

circuit diagram can be used. Output Current IOUT is

obtained as follows :

IOUT= Vreg /R + ISS

Take care that Output Current IOUT does not exceed

its allowable current.

GND

×5RL

SERIES

VOUT

VIN

Tr.1

GND

×5RL

SERIES

VOUT

VIN

Tr.1

Tr.2

IOUT

Vbe2

GND

×5RL

SERIES

VIN

IOUT

ISS

VOUT

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

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