Datasheet > RS5RJ3327B-T1

RS5RJ3327B-T1

更新时间： 2023-08-15 00:00:00

品牌	Logo	应用领域
理光 - RICOH		光电二极管
页数	文件大小	规格书
29页	574K
描述
Switching Regulator, Voltage-mode, 0.25A, 100kHz Switching Freq-Max, CMOS, PDSO8, SOP-8

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RS5RJ3327B-T1 数据手册

RS5RJ

OPERATION

100µH

VIN

VDD

L^X

VOUT

Pch Tr

OSC

VFM

100µF

–

22µF

1µF

LX Tr

Vref1

Vref2

V^SS

FIG. A Diagram of RS5RJ including external circuits

1. V^DDOutput Voltage

VDD output voltage is shown in Fig. B.

(1) In the case of VIN–Vf≥VDD0:

In Area B, LxTr is maintained in an OFF state, so that VIN–Vf (V) is output as it is from VDD pin without

step-up operation.

(2) In the case of VIN–Vf <VDD0:

In Area A, this IC functions as Step-up DC/DC converter. The step-up operation will now be explained

with reference to FIG. A. The step-up operation is an operation for regulating the VDD output voltage by

comparing Vref1 and the VDD output voltage by error amplifier circuits and subjecting LxTr to on-time con-

trol by VFM circuits (i.e., by controlling the step-up operation).

2. V^OUTOutput Voltage

A constant voltage is output from VOUT pin, with above-mentioned the VDD output voltage being subjected to a

step-down operation by a linear regulator. This step-down operation will now be explained with reference to FIG. A.

The step-down operation is an operation for regulating the VDD output voltage by Pch Tr by comparing Vref2 and

the VDD output voltage.

VIN

: Input Voltage

Area A

V^DD0

Area B

VDD

VDD0

: VDD Set Voltage

VOUT0 : VOUT Set Voltage

Vf : ON Voltage of Diode

VOUT

VDD0+Vf

VOUT0

1.2V

10V

Input Voltage (V)

FIG. B Output Voltage vs. Input Voltage characteristic

1...5 6 789 10 11...29

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