PST623XS 查看數據表（PDF） - Mitsumi

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PST623XS

System Reset Monolithic IC

Mitsumi 

MITSUMI

Application Circuits

1. Circuit Diagram

System Reset PST623

2. Detection Voltage Setting

VS

·=·

1.25

·

R1+R2

——————

R2

* Note

The value of I2 should be sufficient to ignore I3.

Make I2 > 5µA.

R2 < 250kΩ

3. How to widen hysteresis

Voltage VIN1 so that Q1 ON goes OFF.

VIN1=———(—R1—+—R2—) ——[1.25 (V) · (R3+R1//R2+R4//R5) - —R—1/—/R— 2 (R4 · VBE+R5 · VCC)]

R2 · (R3+R4//R5)

R4+R5

Voltage VIN2 so that Q1 OFF goes ON.

VIN2=—(R—1—+R—2)— [1.275 (V) · (R1//R2+R3) -VOL · (R1//R2)]

R2 · R3

VOL: Low level output voltage

VBE: Base-emitter voltage of transistor Q1

R1//R2 —R—1 ·—R—2

R1+R2

R4//R5 —R—4 ·—R—5

R4+R5

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