lm1875 question

mjf

Member
2009-01-01 4:53 pm
Austria
datasheet lm1875t...........national:
The LM1875 delivers 20 watts into a 4Ω or 8Ω load on ±25V
supplies. Using an 8Ω load and ±30V supplies, over 30
watts of power may be delivered.

i think this means not to exceed +- 25V with a 4 ohm load (and a proper heatsink).......
(speaker load 4 ohm minimum or bigger)
 
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johnr66

Member
2009-03-05 1:55 pm
IMO, these 5 pin 220 cased chip amps should be limited to +/- 18 volts on 4 Ohm loads. You're really pushing things when you go higher. Loads can be reactive and difficult to drive. The TDA2050 has 5 amp peak current for more wiggle room, but I'd still stay under +/- 20v.

If you need more power, move on to a stronger chip.
 

Robert Kesh

Member
2012-10-28 3:20 pm
IMO, these 5 pin 220 cased chip amps should be limited to +/- 18 volts on 4 Ohm loads. You're really pushing things when you go higher. Loads can be reactive and difficult to drive. The TDA2050 has 5 amp peak current for more wiggle room, but I'd still stay under +/- 20v.

If you need more power, move on to a stronger chip.
yeah, hooked it up to +/-16V and the chip is pretty warm, though the sink is doing its job
 
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