TDA8941P Datasheet, PDF(5/21 Page) NXP Semiconductors – 1.5 W mono Bridge Tied Load BTL audio amplifier

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

TDA8941P Datasheet, PDF (5/21 Pages) NXP Semiconductors – 1.5 W mono Bridge Tied Load BTL audio amplifier

◁

Philips Semiconductors

TDA8941P

1.5 W mono BTL audio ampliï¬er

Table 4: Power rating as function of headroom

Headroom

Power output (THD = 1%)

0 dB

12 dB

Po = 1 W

Po(ALL) = 63 mW

Power dissipation (P)

1.15 W

0.6 W

For the average listening level a power dissipation of 0.6 W can be used for

calculation of the maximum ambient temperature.

8.3 Mode selection

The TDA8941P has three functional modes, which can be selected by applying the

proper DC voltage to pin MODE. See Figure 4 and 5 for the respective DC levels,

which depend on the supply voltage level. The MODE pin can be driven by a 3-state

logic output stage: e.g. a microcontroller with additional components for DC-level

shifting.

Standby â In this mode the current consumption is very low and the outputs are

ï¬oating. The device is in standby mode when (VCC â 0.5 V) < VMODE < VCC, or when

the MODE pin is left ï¬oating (high impedance). The power consumption of the

TDA8941P will be reduced to <0.18 mW.

Mute â In this mode the ampliï¬er is DC-biased but not operational (no audio output);

the DC level of the input and output pins remain on half the supply voltage. This

allows the input coupling and Supply Voltage Ripple Rejection (SVRR) capacitors to

be charged to avoid pop-noise. The device is in mute mode when

3 V < VMODE < (VCC â 1.5 V).

Operating â In this mode the ampliï¬er is operating normally. The operating mode is

activated at VMODE < 0.5 V.

8.3.1 Switch-on and switch-off

To avoid audible plops during supply voltage switch-on or switch-off, the device is set

to standby mode before the supply voltage is applied (switch-on) or removed

(switch-off).

The switch-on and switch-off time can be inï¬uenced by an RC-circuit on the MODE

pin. Rapid on/off switching of the device or the MODE pin may cause âclick- and

pop-noiseâ. This can be prevented by proper timing of the RC-circuit on the MODE

pin.

8.4 Supply Voltage Ripple Rejection (SVRR)

The SVRR is measured with an electrolytic capacitor of 10 ÂµF on pin SVR at a

bandwidth of 10 Hz to 80 kHz. Figure 12 on page 11 illustrates the SVRR as function

of the frequency. A larger capacitor value on the SVR pin improves the ripple rejection

behaviour at the lower frequencies.

9397 750 06864

Product speciï¬cation

Rev. 02 â 7 April 2000

5 of 21

▷