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TDA8933BTW 데이터시트(PDF) 8 Page - NXP Semiconductors |
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TDA8933BTW 데이터시트(HTML) 8 Page - NXP Semiconductors |
8 / 42 page TDA8933B_1 © NXP B.V. 2008. All rights reserved. Preliminary data sheet Rev. 01 — 23 October 2008 8 of 42 NXP Semiconductors TDA8933B Class D audio amplifier Rosc = oscillator resistor (Ω) (on pin OSCREF) Table 5 summarizes how to configure the TDA8933B in master or slave configuration. For device synchronization see Section 14.6. 8.4 Protections The following protections are implemented in the TDA8933B: • Thermal Foldback (TF) • OverTemperature Protection (OTP) • OverCurrent Protection (OCP) • Window Protection (WP) • Supply voltage protections – UnderVoltage Protection (UVP) – OverVoltage Protection (OVP) – UnBalance Protection (UBP) • Electro Static Discharge (ESD) The behavior of the device under the different fault conditions differs according to the protection activated and is described in the following sections. 8.4.1 Thermal Foldback (FT) If the junction temperature of the TDA8933B exceeds the threshold level (Tj > 140 °C), the gain of the amplifier is decreased gradually to a level where the combination of dissipation (P) and the thermal resistance from junction to ambient (Rth(j-a)) results in a junction temperature of around the threshold level. Fig 4. Oscillation frequency as a function of Rosc Table 5. Master or slave configuration Configuration Pin OSCREF OSCIO Master Rosc > 25 kΩ to VSSD(HW) output Slave Rosc = 0 Ω; shorted to VSSD(HW) input 350 450 550 fosc (kHz) 250 Rosc (kΩ) 25 45 40 30 35 010aaa531 |
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