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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TDF8591TH датащи(PDF) 5 Page - NXP Semiconductors |
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TDF8591TH датащи(HTML) 5 Page - NXP Semiconductors |
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5 / 34 page  TDF8591TH_1 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 01 — 5 March 2008 5 of 34 NXP Semiconductors TDF8591TH 2 × 100 W SE (4 Ω) or 1 × 310 W BTL (4 Ω) class-D amplifier The value of the RC time constant should be dimensioned for 500 ms. If the 100 µF capacitor is left out of the application the voltage on pin MODE will be applied with a much smaller time constant, which might result in audible pop noises during start-up (depending on DC output offset voltage and used loudspeaker). In order to fully charge the coupling capacitors at the inputs, the amplifier will remain automatically in Mute mode for approximately 150 ms before switching to Operating mode. A complete overview of the start-up timing is given in Figure 4. 6.3 Pulse width modulation frequency The output signal of the amplifier is a PWM signal with a switching frequency that is set by an external resistor Rext(OSC) connected between pins OSC and VSSA. An optimum setting for the carrier frequency is between 300 kHz and 350 kHz. An external resistor Rext(OSC) of 30 k Ω sets the frequency to 310 kHz. Fig 4. Timing on mode selection input audio operating mute standby 5 V 2.5 V 0 V (SGND) time VMODE 100 ms >50 ms switching audio operating standby 5 V 0 V (SGND) time 001aad837 VMODE 100 ms 50 ms switching |
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