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Old 27th May 2011, 09:15 PM   #1
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Default TDA2030a protection diodes

On the TDA2030A datasheet, there are protection diodes in the 'normal' circuits, but not the bridge schem.

I have a pc board with a pair of these on from junked computer speakers, the plan is to bridge the chip, beef up the heatsink, power supply caps & voltage a bit to make a practise amp.

Does anyone think it's OK to leave to diodes in when the chips are bridged?

TDA2030A Datasheet pdf - 18W HI-FI AMPLIFIER AND 35W DRIVER - ST Microelectronics
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
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Old 28th May 2011, 12:35 AM   #2
sregor is offline sregor  United States
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Yes, it's ok. (my guess is that they left them off the bridged circuit to keep parts count and board simple.) During normal operation they don't do anything - there only function is to prevent excess reverse voltage appearing across the outputs when power is shut off. Perhaps they decided it was less likely with a bridged amp? but I would leave them in. Good luck
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Old 28th May 2011, 09:26 PM   #3
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thanks Steve
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Old 28th May 2011, 10:00 PM   #4
Xoc1 is offline Xoc1  United Kingdom
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The TDA 2040 and TDA 2050 do not require these diodes and will deliver more power.
They are inexpensive ICs to buy. Checkout the data sheets and you will find the circuits are almost identical
Beefing up the heatsinking is a good move as these amplifiers thermally limit and some manufactuers use heatsinks that are very small because they can get away with it!
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Old 28th May 2011, 11:14 PM   #5
sregor is offline sregor  United States
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None of the chips require these diodes - but more than half of the amplifiers I've looked at have them - they are purely for protection of the circuits when powered off, and electrically don't change any performance so YMMV. IMO all amps should use them, but some do and some don't. ( I also always stick them across voltage regulator ICs - reversed between the output and the supply)
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