BD64550EFV データシートの表示（PDF） - ROHM Semiconductor

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BD64550EFV

System Driver for Ink Jet Printers

ROHM Semiconductor 

BD64550EFV

Technical Note

●Protection function

○Protection circuit function

Overall

DC motor drive circuit

Switching regulator circuit

Series regulator circuit

Overheating protection

Overcurrent protection

Overcurrent protection, output overvoltage protection, output low voltage protection

None

○Operation at protection circuit operation

①Overheating protection・・・All functions are shutout along with junction temperature rise

Thermal shutdown temperature

175℃(typ.)

Switching regulator

At protection operation

OFF

Series regulator

OFF

DC motor

OFF

RESET

L

Re-start

Again power-on

②Overcurrent protection (Switching regulator)

Set current

ISWOC

2.6(A)

Operating

Switching regulator

OFF

Mask time

0.5µsec(※)

Series regulator

OFF

State after operation

All function shutout

DC motor

OFF

RESET

L

Re-start

Again power-on

③Overcurrent protection (DC motor)

Set current

IDCOC

3.8(A)

Operating

Switching regulator

ON

Mask time

1.5µsec

Series regulator

ON

State after operation

Shown below

DC motor RESET

OFF

L_PULSE

Re-start

Serial re-input

Motor current

RESET signal

IDCOC setting value

L

Serial data

Data default

1.5μsec 40msec

Fig.26 Timing Chart of Motor Overcurrent Protection

(※) If the output pulse of switching regulator is 0.5µs or below, the overcurrent function does not operate even at the time of overcurrent outflow.

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© 2010 ROHM Co., Ltd. All rights reserved.

11/16

2010.06 - Rev.A

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