LV8044LP Просмотр технического описания (PDF) - ON Semiconductor

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LV8044LP

6-channel Motor Driver IC for Digital Still Camera

ON Semiconductor 

LV8044LP

Current Control Operation Specifications

 Sine wave increasing direction

STEP

Coil current

Set current

Set current

fchop

Current

mode

CHARGE

SLOW

FAST

 Sine wave decreasing direction

STEP

Set current

Coil current

CHARGE

SLOW FAST

Set current

fchop

Current

mode

CHARGE

SLOW

FAST

CHARGE

FAST

CHARGE

SLOW

Each of the current modes operates with the follow sequence.

 The IC enters charge mode when the chopping oscillation starts. (A period of charge mode is forcibly present in 1/8

of the period, regardless of which of the coil current (ICOIL) and the set current (IREF) is larger.)

 In charge mode, the coil current (ICOIL) and the set current (IREF) are compared.

If an ICOIL < IREF state exists during the charge period:

The IC operates in charge mode until ICOIL  IREF. After that, it switches to slow decay mode and then switches to

fast decay mode in the last 1/8 of the period.

If no ICOIL < IREF state exists during the charge period:

The IC switches to fast decay mode and the coil current is attenuated with the fast decay operation until the end of the

chopping period.

The above operation is repeated. Normally, in the sine wave increasing direction the IC operates in slow (+fast) decay

mode, and in the sine wave decreasing direction the IC operates in fast decay mode until the current is attenuated and

reaches the set value and the IC operates in slow decay mode.

No.A0438-17/26

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