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SI8244 датащи(PDF) 7 Page - Silicon Laboratories |
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SI8244 датащи(HTML) 7 Page - Silicon Laboratories |
7 / 12 page 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 |
Аналогичный номер детали - SI8244 |
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Аналогичное описание - SI8244 |
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