TAS5100A

SLES030 – FEBRUARY 2002

8

www.ti.com

device operation

power sequences

system power-up/power-down sequencing

The recommended power-up/power-down sequence is shown in Figure 3. For proper operation the RESET

signal should be kept LOW when both DVDD and output power (PVDDA1, PVDDA2, PVDDB1, and PVDDB2)

are being applied. The RESET signal should remain LOW for at least 1 ms after output power is applied.

> 1 ms

DVDD†

PWDN

PVDDA1

PVDDA2

PVDDB1

PVDDB2

RESET

> 1 ms

> 100

µs

† For most applications, it is recommended that pin 13 (PWDN) be connected directly to pin 6 (DVDD).

Figure 3. Power-Up/Power-Down Sequence

RESET function

The device is put into a reset condition when the (active low) RESET signal is asserted. While in the reset state,

the input H-bridge control signals consisting of PWM_AP, PWM_AM, PWM_BP, and PWM_BM are ignored, and

the H-bridge MOSFETs are placed in a state where OUTPUTA and OUTPUTB are both low. Asserting the

RESET signal low also causes the short circuit protection latch to be reset. The RESET signal is normally

connected to the VALID signal from the TAS5000.

reinitialization sequence

Proper initial conditions for this device include asserting the RESET signal until the reset operation has

completed (1 ms). Additionally, when using this device with the TAS5000 controller, this function can be

accomplished by asserting the reset pin on the TAS5000 during the reset sequence (see Figure 3).

audio application considerations

power supply decoupling

Power supply decoupling and layout optimization information should be obtained by following the detailed

information in the application note SLAA117.

optimal power transfer for H-bridge

The TAS5100A is a power H-bridge that is designed to deliver 30 W/rms into loads of 4

Ω to 8 Ω. Rather than

requiring the usual heatsink, the package is designed to deliver this wattage by careful layout as described in

the application note SLAA117. Careful attention must be given to the value of the high-voltage power supply

level for a given load resistance. See recommended operating conditions.