NCP347(2007) View Datasheet(PDF) - ON Semiconductor

Part Name

Description

MFG CO.

NCP347
(Rev.:2007)

Positive Overvoltage Protection Controller with Internal Low RON NMOS FET and Status FLAG

ON Semiconductor 

NCP347

Vout = 0

FLAG = Low

Reset Timer

Vin < UVLO or

Vin > OVLO

Vout = 0

FLAG = Low

Timer Count

OVLO > Vin > UVLO

Timer Check

T < 50 ms

T = 50 ms

Reset Timer

Vin < UVLO or

Vin > OVLO

Check Vin

FLAG = Low

Timer Count

UVLO < Vin < OVLO

Vout = Open

EN = 1

Check EN

EN = 0

Vout = Vin

Vin < UVLO or

Vin > OVLO

Timer Check

T = 50 ms

T < 50 ms

UVLO < Vin < OVLO

Check EN

UVLO < Vin < OVLO

EN = 1

EN = 0

Vout = Open

FLAG = High

Check Vin

Vin < UVLO or

Vin > OVLO

Vout = Vin

FLAG = High

Check Vin

Figure 18. State Machine

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