2

RH5RH

↑↑

↑

ab

c

SELECTION GUIDE

In RH5RH Series, the output voltage, the driver, and the taping type for the ICs can be selected at the user's

request. The selection can be made by designating the part number as shown below :

For example, the product with Output Voltage 5.0V, the External Driver (the Oscillator Frequency 100kHz)

and Taping Type T1, is designated by Part Number RH5RH502B-T1.

Code

Description

a

Stepwise setting with a step of 0.1V in the range of 2.7V to 7.5V is possible.

Designation of Driver:

1A: Internal Lx Tr. Driver (Oscillator Frequency 50kHz)

b

2B: External Tr. Driver (Oscillator Frequency 100kHz)

3B: Internal Tr./External Tr. (selectively available) (Oscillator Frequency 100kHz, with chip

enable function)

Designation of Taping Type :

c

Ex. SOT-89

: T1, T2

SOT-89-5 : T1, T2

(refer to Taping Specifications)

“T1” is prescribed as a standard.

RH5RH

BLOCK DIAGRAM

Lx

Vss

EXT

LxSW

CE

Error Amp.

OUT

Buffer

PWM control

OSC

Chip Enable

Slow start

Phase Comp.

Vref

+

–

Error Amp. (Error Amplifier) has a DC gain of 80dB, and Phase Comp. (Phase Compensation Circuit)

provides the frequency characteristics including the 1st pole (fp=0.25Hz) and the zero point (fz=2.5kHz).

Furthermore, another zero point (fz=1.0kHz) is also obtained by the resistors and a capacitor connected to

the OUT pin.

(Note) Lx Pin ............only for RH5RH

EXT Pin .........only for RH5RH

CE Pin ...........only for RH5RH