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TAS5100AIDAPRG4 Datasheet(PDF) 8 Page - Texas Instruments |
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TAS5100AIDAPRG4 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 20 page 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. |
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