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TDA8939TH Datasheet(PDF) 5 Page - NXP Semiconductors |
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TDA8939TH Datasheet(HTML) 5 Page - NXP Semiconductors |
5 / 21 page 9397 750 13023 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. Objective data sheet Rev. 01 — 22 April 2004 5 of 21 Philips Semiconductors TDA8939 Zero dead time Class-D 7.5 A power comparator 8. Functional description 8.1 General The TDA8939 class-D power comparator is designed for use in fully digital open-loop class-D audio applications. Excellent timing accuracy with respect to delay times and rise and fall times is achieved and one of the most important sources of distortion in a full digital open-loop audio amplifier is eliminated; the zero dead time switching concept is included. The TDA8939 contains two independent class-D output stages with high power D-MOS switches, drivers, timing and control logic. For protection a temperature sensor, a maximum current detection and overvoltage detection circuit are integrated. An internal protection latch keeps the power comparator in shut-down mode after a fault condition has been detected. External reset of the latch is required via the enable input. 8.2 Protections Overtemperature, overcurrent and overvoltage sensors are included in the TDA8939 power comparator. In the event that the maximum temperature, maximum current or maximum supply voltage is exceeded the diagnostic output is activated (open-drain output pulled-down via external pull-up resistor). The diagnostic output pin is activated (active LOW) in case of: 1. Overtemperature (OTP): the junction temperature (Tj) exceeds a threshold level. 2. Overcurrent (OCP): the output current exceeds the maximum output current threshold level (e.g. when the loudspeaker terminals are short-circuited it will be detected by the current protection). 3. Overvoltage (OVP): the supply voltage applied to the power comparator exceeds the maximum supply voltage threshold level. The TDA8939 is self-protecting. If a fault condition (OTP, OCP or OVP) is detected it will pull-down the diagnostic output (pin 7), while at the same time shutting down the power stage. In case of a fault condition in one of the half-bridges or output channel the other half-bridge and output channel will also shut down. All protections trigger a latch which ensures that the power stage remains deactivated until the latch is reset again. The latch is reset by switching the enable voltage of the power stage to LOW level. Both set (S) and reset (R) inputs of the protection latch trigger on a negative falling slope. STAB1 19 decoupling internal stabilizer for logic supply channel 1 VSSP1 20 negative power supply voltage for channel 1 OUT1 21 PWM output channel 1 BOOT1 22 bootstrap capacitor 1 VDDP1 23 positive power supply voltage for channel 1 VSSD 24 negative digital supply voltage SUB - heat spreader of package; internally connected to VSSD Table 3: Pin description …continued Symbol Pin Description |
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