BD8253EFV-M datasheet(11/41 Pages) ROHM

No de pièce	BD8253EFV-M

Description	6ch System Motor Driver for Car AV

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Fabricant	ROHM [Rohm]

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TSZ02201-0H5H0BK01730-1-2

26.Jan.2016 Rev.001

www.rohm.com

TSZ22111

• 15 • 001

BD8253EFV-M

6. Actuator Driver (Focus/Tracking)

(1) Voltage Gain Calculation

The output voltage is set by the input voltage (difference voltage of FCIN/TKIN and VC) x voltage gain (GVACT).

Voltage gain can be adjusted by an external input resistor RIN.

RIN

IN

50k

Level

Shift

+

-

× 2

VO+

VO-

× 2

VIN

×2

100k

VREF

VO+

VO-

VO = (VO+) - (VO-)　

→　4 times between output

100k

RIN + 50k

100k

Ω

RIN + 50kΩ

VC

×0.94

VREF +

×0.94×2×(VIN-VC)

100k

Ω

RIN + 50kΩ

VREF -

×0.94×2×(VIN-VC)

VC

Figure 17. Actuator (Focus/Tracking) Closed Loop Voltage Gain Calculation Diagram

Voltage Gain expression is given by following formula

�� =

��

=

100k

��+50k

× 0.94 × 2 × 2 [dB]

When RIN = 0

�� =

��

=

100k

50k

× 0.94 × 2 × 2 = 17.5 [dB]

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