MP7752 – 18V, 2X15W STEREO FIX FREQUENCY INDUCTORLESS BTL CLASS D AUDIO AMPLIFIER

MP7752 Rev. 1.01

www.MonolithicPower.com

12

5/27/2016

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PIN FUNCTIONS

Pin #

Name

Description

1

EN

Enable input. Drive EN high to turn on the Amplifier 1A/1B/2A/2B, low to turn them off.

2

/FAULT

Fault Output. A low output at FAULT indicates that the IC has detected an over

temperature or over current condition. This output is open drain.

3

IN1A

Positive audio input for channel 1. Biased at 2.5V.

4

IN1B

Negative audio input for channel 1. Biased at 2.5V.

5

GAIN0

Gain selection bit.

6

GAIN1

Gain selection bit.

7

AVCC

Internal analog reference, 5.5V, need connect a bypass capacitor from AVCC to AGND.

8

AGND

Analog ground.

9

VDR

Gate Drive Supply Bypass. VDR powers the internal circuitry, internal MOSFET gate

drive. Bypass VDR to AGND with a 0.1μF to 10μF capacitor.

10

PLIMIT

Power limit and anti-clipping feature control.

Connect a resistor divider from AVCC to GND to set power limit. Connect directly to

AVCC for no power limit.

11

IN2B

Negative audio input for channel 2. Biased at 2.5V.

12

IN2A

Positive audio input for channel 2. Biased at 2.5V.

13

InAbsence Open drain output used to report the input signal absence.

14

Cap_D

Delay Time control for input signal absence report function. This holding time can be

adjusted with external capacitor. Connect this pin to AGND to disable automatic shutdown

with zero signal input function.

15, 16

PVCC2

Power supply input for channel 2. Bypass PVCC2 to PGND2 with a 1μF X7R capacitor (in

addition to the main bulk capacitor), placed close to the PVCC2 and PGND2 pins.

17

BST2A

High-side MOSFET bootstrap input for Amplifier 2A. A capacitor from BST2A to SW2A

supplies the gate drive current to the internal high-side MOSFET.

18

SW2A

Switched power output for Amplifier 2A (the positive output of channel 2).

19

PGND2

Power ground for Amplifier 2A/2B.

20

SW2B

Switched power output for Amplifier 2B (the negative output of channel 2).

21

BST2B

High-side MOSFET bootstrap input for Amplifier 2B. A capacitor from BST2B to SW2B

supplies the gate drive current to the internal high-side MOSFET.

22

BST1B

High-side MOSFET bootstrap input for Amplifier 1B. A capacitor from BST1B to SW1B

supplies the gate drive current to the internal high-side MOSFET.

23

SW1B

Switched power output for Amplifier 1B (the negative output of channel 1).

24

PGND1

Power ground for Amplifier 1A/1B.

25

SW1A

Switched power output for Amplifier 1A (the positive output of channel 1).

26

BST1A

High-side MOSFET bootstrap input for Amplifier 1A. A capacitor from BST1A to SW1A

supplies the gate drive current to the internal high-side MOSFET.

27, 28

PVCC1

Power supply input for channel 1. Bypass PVCC1 to PGND1 with a 1μF X7R capacitor (in

addition to the main bulk capacitor), placed close to the PVCC1 and PGND1 pins.