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TDA8566TH1 数据表(PDF) 7 Page - NXP Semiconductors |
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TDA8566TH1 数据表(HTML) 7 Page - NXP Semiconductors |
7 / 21 page TDA8566_6 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 06 — 15 October 2007 7 of 21 NXP Semiconductors TDA8566 2 × 40 W/2 Ω stereo BTL car radio power amplifier 7.3 Short-circuit diagnostic (pin DIAG) When a short-circuit occurs at one or more outputs to ground or to the supply voltage, the output stages are switched off until the short-circuit is removed and the device is switched on again (with a delay of approximately 20 ms after the removal of the short-circuit). During this short-circuit condition, pin DIAG is continuously LOW. When a short-circuit occurs across the load of one or both channels, the output stages are switched off for approximately 20 ms. After that time the load condition is checked during approximately 50 µs to see whether the short-circuit is still present. Due to this duty cycle of 50 µs/20 ms the average current consumption during the short-circuit condition is very low (approximately 40 mA). During this condition, pin DIAG is LOW for 20 ms and HIGH for 50 µs; see Figure 6. The power dissipation in any short-circuit condition is very low. 7.4 Temperature pre-warning (pin DIAG) When the virtual junction temperature (Tvj) reaches 145 °C, pin DIAG will become continuously LOW. 7.5 Open-collector diagnostic outputs Pins DIAG and CLIP are open-collector outputs, therefore more devices can be tied together. Pins DIAG and CLIP can also be tied together. An external pull-up resistor is required. Fig 5. Clip detection waveforms 0 VO (V) VCLIP (V) 0 t (s) mgu357 Fig 6. Short-circuit diagnostic timing diagram mgu360 short-circuit over the load 20 ms 50 µs t (s) t (s) VDIAG (V) current in output stage |
类似零件编号 - TDA8566TH1 |
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类似说明 - TDA8566TH1 |
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