MP1720 – 2.7W LOW EMI HIGH EFFICIENCY MONO CLASS-D AUDIO AMPLIFIER

MP1720 Rev. 1.01

www.MonolithicPower.com

10

8/9/2012

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© 2012 MPS. All Rights Reserved.

The peak-to-peak range of limited input voltage

(1)

Take the application with input coupling capacitor

on each input pin is set internally (detailed value

please see Input Bias Voltage in the EC table).

For different gain options, the calculated

maximum input signal and the tested maximum

output power, with SE input or differential input,

are shown in the Table 2.

Table 2—Maximum Input voltage and

Maximum Output Power

Test condition:VIN=PVIN=5V; 4Ω load.

SE input

Differential input

Part

(W)

(W)

MP1720-3

2.99

0.52

5.98

1.9

MP1720-6

2.88

0.93

5.76

2.7 @ 10%

THD+N

MP1720-9

2.72

1.74

5.44

2.7 @ 10%

THD+N

MP1720-

12

2.568

2.62

5.136

2.7 @ 10%

THD+N

MP1720-

216

1.93

2.7 @ 10%

THD+N

3.86

2.7 @ 10%

THD+N

Shutdown Function

The MP1720

SHDN input is a low-active control.

To shutdown MP1720, drive SHDN low-level

voltage. To enable MP1720, drive

SHDN high-

level voltage. Shutdown function can place the

MP1720 in a low-power (0.1μA) shutdown mode

and reduce power consumption and extend

battery life.

Thermal Shutdown/ Short Circuit Protection

The MP1720 provides internal over thermal

protection and short-circuit protection. The

amplifier would be disabled to prevent damage to

the IC if the junction temperature surpasses

+125°C. The junction temperature must fall below

+112°C before normal operation resumes. The

currents of both the high-side and low-side

MOSFETs are measured. If the current exceeds

an internally preset value, all MOSFETs will be

turned off. After the over thermal or short circuit

fault is monitored, the MP1720 remains disabled

status for a minimum of 50μs until normal

operation resumes.

Pop Suppression

After driving SHDN pin high, there is a 15ms

Start-up time to eliminate the startup pop. During

this period, an internal circuitry would charges

the bias voltages of the device to a certain level

to prevent the startup click or pop. And after

driving SHDN pin low, the all outputs will be set

to high impedance immediately