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TDF8591TH 数据表(PDF) 6 Page - NXP Semiconductors |
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TDF8591TH 数据表(HTML) 6 Page - NXP Semiconductors |
6 / 34 page TDF8591TH_1 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 01 — 5 March 2008 6 of 34 NXP Semiconductors TDF8591TH 2 × 100 W SE (4 Ω) or 1 × 310 W BTL (4 Ω) class-D amplifier If two or more class-D amplifiers are used in the same audio application, it is recommended to synchronize the switching frequency of all devices to an external clock (see Section 12.3). 6.4 Protections The following protections are included in TDF8591TH: • Thermal Foldback (TF) • OverTemperature Protection (OTP) • OverCurrent Protection (OCP) • Window Protection (WP) • Supply voltage protections – UnderVoltage Protection (UVP) – OverVoltage Protection (OVP) – Unbalance Protection (UBP) The reaction of the device on the different fault conditions differs per protection and is described in Section 6.4.1 to Section 6.4.5. 6.4.1 Thermal foldback If the junction temperature Tj > 145 °C, then the TF gradually reduced the gain, resulting in a smaller output signal and less dissipation. At Tj = 155 °C the outputs are fully muted. 6.4.2 Overtemperature protection If Tj > 160 °C, then the OTP will shut down the power stage immediately. 6.4.3 Overcurrent protection The OCP will detect a short-circuit between the loudspeaker terminals or if one of the loudspeaker terminals is short-circuited to one of the supply lines. If the output current tends to exceed the maximum output current of 12 A, the output voltage of the TDF8591TH will be regulated to a level where the maximum output current is limited to 12 A while the amplifier outputs remain switching, the amplifier does not shut down. When this active current limiting continues longer than a time τ (see Figure 5) the capacitor on pin DIAG is discharged below a threshold value and the TDF8591TH shuts down. Activation of current limiting and the triggering of the OCP is observed at pin DIAG (see Figure 5). A maximum value for the capacitor on pin DIAG is 47 pF. The reference voltage on pin DIAG is VSSA. Pin DIAG should not be connected to an external pull-up. |
类似零件编号 - TDF8591TH |
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类似说明 - TDF8591TH |
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