RH5RI251B Просмотр технического описания (PDF) - RICOH Co.,Ltd.

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RH5RI251B

VFM STEP-UP DC/DC CONVERTER

RICOH Co.,Ltd. 

RH5RI

BLOCK DIAGRAM

Lx

Vss

EXT

LxSW

VLX limiter

Buffer

VFM Control

OSC 100kHz

Chip Enable

Vref

–

+

Error Amp.

OUT

CE

(Note) Lx Pin............only for RH5RI××1B and RH5RI××3B

EXT Pin.........only for RH5RI××2B and RH5RI××3B

CE Pin...........only for RH5RI××3B

SELECTION GUIDE

In RH5RI 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 :

RH5RI×××× – ×× ← Part Number

↑↑ ↑

ab c

Code

a

Contents

Setting Output Voltage (VOUT):

Stepwise setting with a step of 0.1V in the range of 2.5V to 7.5V is possible.

Designation of Driver:

1B: Internal Lx Tr. Driver (Oscillator Frequency 100kHz)

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 :

Ex. SOT-89 : T1, T2

c

SOT-89-5 : T1, T2

(refer to Taping Specification)

“T1” is prescribed as a standard.

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 RH5RI502B-T1.

2

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