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TB2938HQ Datasheet(PDF) 11 Page - Toshiba Semiconductor |
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TB2938HQ Datasheet(HTML) 11 Page - Toshiba Semiconductor |
11 / 26 page TB2938HQ 2011-11-08 11 IN1 to 4ch R2=C1/C6 × Rg 10 16 Rg C1 C6 10.2 Output Short Detection In case of shorting output to VCC/GND or over voltage power supplied, NPN transistor is turned on. In case of shorting output to output NPN Tr. is turned on and off in response to the input signal voltage. 10.3 Layer Short Detection The TB2938HQ may be properly connected to a load such as a 4- speaker, but one of the speaker lines may be shorted to ground through a low-impedance path. The TB2938HQ can detect such a condition. As is the case with output DC offset detection, pin 25 is also activated when there is a short on one of the speaker lines as shown above. The detection impedance is 4.5 (typ.). This feature allows detection of a short-circuit through a low-impedance path other than the speaker impedance. It helps to avoid speaker damage in case of anomalous system conditions and improve system reliability. 11. 6-V Cruising Functionality The TB2938HQ can continually provide audio output even in the event of an abrupt battery voltage drop as a result of reboot from idling stop mode. To reduce the turn-on pop, it is recommended to use a resistor of 2.2 k or less for Rg, a signal source resistor. Inserting a resistor of (C1 / C6 Rg) in series with C6 helps to further reduce the pop. When Rg > 2.2 k , the amount of pop should be carefully verified in the end-use application environment. Figure 10-2 Layer Short Figure11-1 Vicinity of the Input Pins VCC IC GND out out SP 4 The negative ( ) speaker connection is shorted to ground through a low-impedance path due to some irregularities. |
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