LB1895 Просмотр технического описания (PDF) - SANYO -> Panasonic

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LB1895

3-Phase Brushless Motor Driver for CD-ROM Spindle Motors

SANYO -> Panasonic 

LB1895, 1895D

LB1895,1895D — Example of using a comparator to detect the direction of rotation

When VC ^ VCREF

VCOMPO

WCOMPO

When VC % VCREF

VCOMPO

WCOMPO

A06729

When the phasing is as shown above, the direction of rotation is determined to be

‘‘forward’’ if WCOMPO is low at the rising edge of VCOMPO, and

‘‘reverse’’ if WCOMPO is high at the rising edge of VCOMPO.

1) Reverse full braking method

Braking is applied with VC = L until reverse rotation is detected. The moment that reverse rotation is detected, the driving

power is turned off or a short pulse is input.

2) Intermittent braking method

VCOMPO

WCOMPO

fig. 1

VC = 2.5V

VC = 0V

fig. 2

A06730

If braking is applied according to the value obtained by OR logic in VCOMPO and WCOMPO together, for example, reverse braking

is applied according to the following timing.

As a result, when the rotation speed is fast, braking is applied many times; at slower speeds, braking is applied fewer times.

Furthermore, if the VCOMPO and WCOMPO logic combination is changed, the duty of VC = 0 V – 2.5 V also changes.

No.5634-11/12

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