TAS5701
SLOS559–JUNE 2008...................................................................................................................................................................................................... www.ti.com
Gain Control
The gain of the DAP is selected via two external gain pins (GAIN_0 and GAIN_1). Table 2 lists the corresponding
channel gain (for ALL channels) for GAIN_0 and GAIN_1 settings. Individual channel gain is not possible.
Changes to the GAIN_x terminals are latched in immediately on a rising edge of RESET. Changes to the
GAIN_x terminals while RESET is high are not allowed.
Table 2. Gain Control
GAIN_1
GAIN_0
CHANNEL GAIN (dB)
0
0
1
1
0
1
0
1
0
6
12
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DEVICE PROTECTION SYSTEM
The TAS5701 contains advanced protection circuitry carefully designed to facilitate system integration and ease
of use, as well as to safeguard the device from permanent failure due to a wide range of fault conditions such as
short circuits, overtemperature, and undervoltage. The TAS5701 responds to a fault by immediately setting the
power stage in a high-impedance (Hi-Z) state and reporting the error on the FAULT pin (FAULT = 0); the device
automatically recovers when the fault condition has been removed.
Short-Circuit Protection
The device has independent, fast-reacting current detectors on all high-side and low-side power-stage FETs. The
detector outputs are closely monitored by a protection system. If a high-current condition situation exists, i.e., the
power stage outputs are shorted, the protection system triggers a latching shutdown, resulting in the power stage
being set in the high-impedance (Hi-Z) state and FAULT going low. Overcurrent protection is not independent for
half-bridges A and B and, respectively, C and D. That is, if the bridge-tied load between half-bridges A and B
causes an overcurrent fault, half-bridges A, B, C, and D are shut down.
Overtemperature Protection
If the device junction temperature exceeds 150°C (nominal), the device is put into thermal shutdown, resulting in
all half-bridge outputs being set in the high-impedance (Hi-Z) state and FAULT going low. Once the temperature
decreases 30°C (typical), the device resumes normal operation.
Undervoltage Protection (UVP) and Power-On Reset (POR)
The UVP and POR circuits of the TAS5701 fully protect the device in any power-up/down and brownout situation.
While powering up, the POR circuit resets the protection circuitry and ensures that all circuits are fully operational
when the VDD and GVDD_X supply voltages reach 9.6 V (typical). Although GVDD_x and VDD pins are
independently monitored, a supply voltage drop below the UVP threshold on any VDD or GVDD_x pin results in
all outputs immediately being set in the high-impedence (Hi-Z) state and FAULT pin being asserted low. The
device automatically resumes operation when all supply voltages have increased above the UVP threshold.
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