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STA510A 데이터시트(PDF) 11 Page - STMicroelectronics

부품명 STA510A
상세설명  44-volt, 5.5-amp, quad power half bridge
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제조업체  STMICROELECTRONICS [STMicroelectronics]
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STA510A
Technical information
Doc ID 11077 Rev 2
11/17
4.2
Protection circuitry
The STA510A 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 thesholds
under normal operation.
4.3
Power outputs
The STA510A 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.
4.4
Parallel output / high current operation
When using the DDX mode output, the STA510A outputs can be connected in parallel in
order to increase the output current capability to a load. In this configuration the STA510A
can provide up to 200 W into a 3-
Ω load.
This mode of operation is enabled with the 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 9 on page 12
4.5
Output filtering
A passive 2nd-order filter is used on the STA510A power outputs to reconstruct the analog
audio signal. System performance can be significantly affected by the output filter design
and choice of passive components. A filter design for 6- or 8-
Ω loads is shown in the
application circuit of Figure 8, and for 4-
Ω loads in Figure 9 and Figure 10.


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