LA6568

No.7740-7/8

CH1(BTL AMP)

CH2(BTL AMP)

CH6(LOADING)

CH4(BTL AMP)

MUTE

CH5(BTL AMP)

CH3(LOADING)

Note:

• 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)

3.3VREG

5VREG

When IN-MUTE is low

OFF

−

OFF

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.

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)

ON

VREF

< 0.7 (V)

OFF

Loading Block

(FWD)

(REV)

Loading output

L

Brake

L

H

L

H

H

Note

Note:

• 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).