LA6568 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LA6568

Six-Channel Driver for Optical Disc Drives

SANYO -> Panasonic 

LA6568

Relationship Between Muting and the P-VCC Power Supply

MUTE

CH1(BTL AMP)

CH2(BTL AMP)

CH6(LOADING)

CH4(BTL AMP)

CH5(BTL AMP)

CH3(LOADING)

P-VCC

Note: • Connect both S-VCC and P-VCC to the power supply system externally.

• Connect both S-GND and P-GND to the ground system externally.

Muting Functions vs. Outputs and 3.3 V Regulator Operating States

CH1, 2, 4, 5

(BTL-AMP)

CH3, 6

(LOADING)

When IN-MUTE is low

When the thermal shutdown circuit has operated

OFF

OFF

−

OFF

When VREF has fallen below 0.7 V

OFF

−

Note: • A dash (−) indicates no operation for functions to which muting, thermal shutdown, or VREF fall protection apply.

• The IN-MUTE pin applies to the BTL amplifiers (channels 1, 2, 4, and 5) and the 3.3 V and 5 V regulators.

• The VREF fall protection function only applies to the BTL amplifiers.

3.3VREG

5VREG

OFF

OFF

−

The muting function applies to the BTL amplifiers (channels 1, 2, 4, and 5) and the 3.3 V and 5 V regulators.

IN-MUTE state

BTL-AMP

(CH1, 2, 4, 5)

3.3VREG

5 VREG

H

ON

L

OFF

The VREF fall protection function only applies to the BTL amplifiers.

VREF state

BTL-AMP

(CH1, 2, 4, 5)

VREF > 0.7 (V)

VREF < 0.7 (V)

ON

OFF

Loading Block

VIN∗+

(FWD)

VIN∗−

(REV)

Loading output

L

L

H

L

H

H

Brake

Reverse (VO = −1.5 × REV) ∗1

Forward (VO = 1.5 × FWD) ∗1

(VO = 1.5 × (FWD − REV))

Note ∗1: FWD: VIN6+, VIN3+, REV: VIN6−, VIN3−

Note: • In brake mode, the + and - output voltages both go to VCC/2.

• The "L" voltage level is any level less than VF (approximately 0.6 V).

• The loading circuit (channels 3 and 6) gain is 3.5 dB (typical).

No.7740-7/8

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