Datasheet

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1 nF

Ferrite

Chip Bead

OUTP

OUTN

Ferrite

Chip Bead

1 nF

7 Ω or Greater

0.47 µF

33 µH

OUTP

OUTN

8 Ω

Ferrite

Chip Bead

Ferrite

Chip Bead

1 nF

SHORT-CIRCUIT PROTECTION

THERMAL PROTECTION

TPA3007D1

SLOS418D – SEPTEMBER 2003 – REVISED MARCH 2008

Figure 16. Typical Ferrite Chip Bead Filter (Chip bead example: Fair-Rite 2512067007Y3)

Figure 17. Typical LC Output Filter for 8- Ω Speaker, Cutoff Frequency of 41 kHz

The TPA3007D1 has short circuit protection circuitry on the outputs that prevents damage to the device during

output-to-output shorts, output-to-GND shorts, and output-to-V

shorts. When a short-circuit is detected on the

outputs, the part immediately disables the output drive and enters into shutdown mode. This is a latched fault

and must be reset by cycling the voltage on the SHUTDOWN pin to a logic low and back to the logic high state

for normal operation. This clears the short-circuit flag and allow for normal operation if the short was removed. If

the short was not removed, the protection circuitry again activates.

Two Schottky diodes are required to provide short-circuit protection. The diodes should be placed as close to the

TPA3007D1 as possible, with the anodes connected to PGND and the cathodes connected to OUTP and OUTN

as shown in the application circuit schematic. The diodes should have a forward voltage rating of 0.5 V at a

minimum of 1A output current and a dc blocking voltage rating of at least 30 V. The diodes must also be rated to

operate at a junction temperature of 150 ° C.

If short-circuit protection is not required, the Schottky diodes may be omitted.

Thermal protection on the TPA3007D1 prevents damage to the device when the internal die temperature

exceeds 150 ° C. There is a ± 15 ° C tolerance on this trip point from device to device. Once the die temperature

exceeds the thermal set point, the device enters into the shutdown state and the outputs are disabled. This is not

a latched fault. The thermal fault is cleared once the temperature of the die is reduced by 15 ° C. The device

begins normal operation at this point with no external system interaction.

Product Folder Link(s): TPA3007D1