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STA516B Datasheet(PDF) 11 Page - STMicroelectronics |
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STA516B Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 17 page STA516B Applications information Doc ID 13183 Rev 4 11/17 5.2 Protection circuitry The STA516B includes protection circuitry for overcurrent and thermal overload conditions. A thermal warning pin (THWARN, pin 28, open drain MOSFET) is activated low when the IC temperature exceeds 130 °C, just in advance of thermal shutdown. When a fault condition is detected an internal fault signal immediately disables the output power MOSFETs, placing both H-bridges in a high-impedance state. At the same time the open-drain MOSFET of pin FAULT (pin 27) is switched on. There are two possible modes subsequent to activating a fault. " Shutdown mode: with pins FAULT (with pull-up resistor) and TRISTATE separate, an activated fault disables the device, signalling a low at pin FAULT output. The device may subsequently be reset to normal operation by toggling pin TRISTATE from high to low to high using an external logic signal. " Automatic recovery mode: This is shown in the applications circuits below where pins FAULT and TRISTATE are connected together to a time-constant circuit (R59 and C58). An activated fault forces a reset on pin TRISTATE causing normal operation to resume following a delay determined by the time constant of the circuit. If the fault condition persists, the circuit operation repeats until the fault condition is cleared. An increase in the time constant of the circuit produces a longer recovery interval. Care must be taken in the overall system design not to exceed the protection thresholds under normal operation. 5.3 Power outputs The STA516B power and output pins are duplicated to provide a low-impedance path for the device bridged outputs. All duplicate power, ground and output pins must be connected for proper operation. The PWRDN or TRISTATE pin should be used to set all power MOSFETs to the high-impedance state during power-up until the logic power supply, VL, has settled. 5.4 Parallel output / high current operation When using the FFX® mode output, the STA516B outputs can be connected in parallel to increase the output current capability to the load. In this configuration the STA516B can provide up to 400 W into a 3- Ω load. This mode of operation is enabled with pin CONFIG (pin 24) connected to pin VDD. The inputs are joined so that IN1A = IN1B, IN2A = IN2B and similarly the outputs OUT1A = OUT1B, OUT2A = OUT2B as shown in Figure 8. 5.5 Output filtering A passive 2nd-order filter is used on the STA516B power outputs to reconstruct the analog audio signal. System performance can be significantly affected by the output filter design and choice of passive components. Filter designs for 3- and 6- Ω loads are shown in the applications circuits of Figure 7, Figure 8 and Figure 9. |
Número de pieza similar - STA516B_10 |
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Descripción similar - STA516B_10 |
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