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TDA8920C 数据表(PDF) 10 Page - NXP Semiconductors |
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TDA8920C 数据表(HTML) 10 Page - NXP Semiconductors |
10 / 40 page TDA8920C_1 © NXP B.V. 2008. All rights reserved. Preliminary data sheet Rev. 01 — 29 September 2008 10 of 40 NXP Semiconductors TDA8920C 2 × 110 W class-D power amplifier If an impedance drop occurs (e.g. due to dynamic behavior of the loudspeaker) OCP is activated. The maximum output current stays limited to 9.2 A but the amplifier will not switch off completely, preventing audio holes from occurring. The result is a clipped output signal. See Section 13.7 for more information on this maximum output current limiting feature. 8.3.3 Window Protection (WP) Window Protection (WP) checks the conditions at the output terminals of the power stage and is activated: • During the start-up sequence, when pin MODE is switched from standby to mute. In the event of a short-circuit at one of the output terminals to pin VDDPn or pin VSSPn, the start-up procedure is interrupted. The TDA8920C waits until the short-circuit to the supply lines is removed. No large currents will flow in the event of a short-circuit because the test is done before the power stages are enabled. • When the amplifier shuts down completely due to OCP activation because of a short-circuit to one of the supply lines; WP is activated during a restart after 100 ms. The amplifier will not start up until the short-circuit to the supply lines is removed. 8.3.4 Supply voltage protection If the supply voltage drops below the minimum supply voltage, the UnderVoltage Protection (UVP) circuit is activated and the system shuts down correctly. If the internal clock is used, the switch-off will be silent and without pop noise. When the supply voltage rises above the threshold level, the system restarts after 100 ms. If the supply voltage exceeds the maximum supply voltage, the OVP circuit is activated and the power stages are shut down. When the supply voltage drops below the threshold level, the system restarts after 100 ms. An additional UnBalance Protection (UBP) circuit compares the positive analog voltage (on pin VDDA) and the negative analog supply voltage (on pin VSSA) and is triggered if the voltage difference exceeds a factor of two. When the supply voltage difference drops below the threshold level, the system restarts after 100 ms. Example: With a symmetrical supply of ±30 V, the protection circuit is triggered if the unbalance exceeds approximately 15 V; see Section 13.7. An overview is given of all protection strategies and their respective effects on the output signal in Table 4. |
类似零件编号 - TDA8920C |
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类似说明 - TDA8920C |
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