Obsolete

Product(s)

- Obsolete

Product(s)

Obsolete

Product(s)

- Obsolete

Product(s)

STA518A

8/14

– 1) SHUTDOWN mode: with FAULT (pull-up resistor) and TRI-STATE pins independent, an activated

fault will disable the device, signaling low at the FAULT output.

The device may subsequently be reset to normal operation by toggling the TRI-STATE

pin from

High to Low to High using an external logic signal.

– 2) AUTOMATIC recovery mode: This is shown in the Audio Application Circuit of Quad single End-

ed). The FAULT and TRI-STATE pins are shorted together and connected to a time constant circuit

comprising R59 and C58.

An activated FAULT will force a reset on the TRI-STATE pin causing normal operation to resume fol-

lowing a delay determined by the time constant of the circuit.

If the fault condition is still present , the circuit operation will continue repeating until the fault condition

is removed .

An increase in the time constant of the circuit will produce a longer recovery interval. Care must be

taken in the overall system design as not to exceed the protection thesholds under normal operation.

3.3 Power Outputs:

The STA518A power and output pins are duplicated to provide a low impedance path for the device's bridged

outputs .

All duplicate power, ground and output pins must be connected for proper operation.

The PWRDN or TRI-STATE pins should be used to set all MOSFETS to the Hi-Z state during power-up until the

logic power supply, VL , is settled.

3.4 Parallel Output / High Current Operation:

When using DDX Mode output , the STA518A outputs can be connected in parallel in order to increase the out-

put current capability to a load.

In this configuration the STA518A can provide 70W into 8 ohm.

This mode of operation is enabled with the CONFIG pin (pin.24) connected to VREG1 and the inputs combined

INLA=INLB, INRA=INRB and the outputs combined OUTLA=OTLB, OUTRA=OUTRB.

3.5 Additional Informations:

Output Filter: A passive 2nd-order passive filter is used on the STA518A power outputs to reconstruct an analog

Audio Signal .

System performance can be significantly affected by the output filter design and choice of passive components.

A filter design for 6ohm/8ohm loads is shown in the Typical Application circuit of fig.10.

Quad Single ended circuit (page 1) shows a filter for ½ bridge mode, 4 ohm loads.