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SI8244 датащи(PDF) 7 Page - Silicon Laboratories

номер детали SI8244
подробное описание детали  PERFORMANCE IMPROVEMENTS IN CLASS D AUDIO AMPLIFIERS
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производитель  SILABS [Silicon Laboratories]
домашняя страница  http://www.silabs.com
Logo SILABS - Silicon Laboratories

SI8244 датащи(HTML) 7 Page - Silicon Laboratories

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AN542
Rev. 0.1
7
10. Overcurrent Protection
The Silicon Labs Class D reference design has an overcurrent protection circuit consisting of a low-power
comparator floating off the upper and lower bus voltages. The upper rail circuit is shown in Figure 5 and is
duplicated on the lower rail. It monitors the current flowing through the 0.005
 resistor (RSENSE) (Zener diode D1
and resistor R5 supply power to the comparator and the Silicon Labs Si8410 digital isolator). The Si8410 performs
the necessary level shifting to interface to the shutdown circuitry.
The circuit is set to trip at roughly a 20 A fault, usually caused by a short-circuit across the speaker terminals or a
large overdrive signal at the audio inputs. Note that the upper and lower overcurrent circuits are ORd together
through a pair of diodes and sent to the reset control circuit. The normally low Si8410 A1 input is driven high upon
detection of an overcurrent condition and asserts the SHUTDOWN signal, forcing the reset controller to assert a
reset signal, momentarily halting amplifier operation. The reset control circuit attempts restart after one second,
and, if the fault is still present, again cycles reset in "hiccup" mode with a frequency of one second. This process
continues until the fault is removed.
Figure 5. Overcurrent Protection Circuit
11. Undervoltage Protection
The undervoltage protection comparator monitors the positive bus voltage and releases the undervoltage lockout
when the voltage is above 37 V, and the amplifier starts-up after a one-second delay. Note that the red LED
remains lit when the amplifier is in shutdown mode and turns off when the amplifier is enabled.
12. Other Features
A protection circuit jumper option is included that allows the amplifier to be manually shut down. This jumper can
be replaced with a switch or other control circuit, allowing the amplifier to be muted. The one-second undervoltage
lockout delay allows the opamps and comparator to settle before the shutdown circuit is released, thereby
preventing speaker pops. There are also individual jumper options on each channel that allow the user to enable or
disable each channel independently to aid in system performance evaluation.
+
-
C1
R2
R4
R3
Si8410
Digital Isolator
R5
R1
RSENSE
GND2
GND2
GND1
A1
VDD1
VDD1
To High Side
MOSFET
VDD2
B1
5V
SHUTDOWN
D1
50V


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