RV5VH 查看數據表（PDF） - RICOH Co.,Ltd.

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RV5VH

DC/DC CONVERTER CONTROLLER

RICOH Co.,Ltd. 

RV5VH1××/RV5VH2××

• Voltage Detector

RV5VH1××/RV5VH2××

Ra

+

Rb Vref

–

Tr.1

Rc

VSEN

2

Output Tr. 8 DOUT

Pull-up

The VD can operate by the voltage of “VOUT1”. The detector threshold and the reset voltage are internally adjusted by

trimmed resistors and the VD monitors VSEN pin voltage.

The DOUT is Nch open-drain output and a pull up resistor is necessary.

Oepration Diagram

VSEN pin is pulled up to VOUT1 voltage

12

3

Reset Voltage

+VDET

Detector Threshold –VDET

A

GND

Step

45

Comparator(+) Pin

B

Input Voltage

Hysteresis Range

Comparator Output

Step 1

A

H

Step 2 Step 3 Step 4 Step 5

B

B

B

A

L

L

L

H

Tr. 1

OFF ON ON ON OFF

Output Tr

OFF ON Indefinite ON OFF

Output Voltage

GND

Rb+Rc

A:

Ra+Rb+Rc

Rb

B:

Ra+Rb+Rc

× VSEN

× VSEN

Step 1. Output Voltage is equal to Pull-up Voltage.

Step 2. When Input voltage (VSEN) reaches the state of Vref≥VSEN×(Rb×Rc)/(Ra+Rb+Rc) at point A, the output of the comparator is reversed. so that the

output voltage becomes to GND.

Step 3. Output VoItage becomes indefinite when Power source Voltage (VSEN) is smaller than Minimum Operating VoItage. When the output is pulIed up,

Output becomes pull-up voltage and GND.

Step 4. Output VoItage becomes to GND.

Step 5. When input voltage(VSEN) reaches the state of Vref≤VSEN×Rb/(Ra+Rb) at point B, the output of the comparator is reversed, so that the output voltage

becomes to pull-up voltage.

20

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