Like it says on the tin.
Was perusing Toshiba Semi's site and looking at the spec sheets. There's no noise figures! Would anyone happen to know where I could fine that info? Or maybe someone who's already done some testing to get that that answer? Or am I wasting my time looking because they aren't that good? (Jk)
Was perusing Toshiba Semi's site and looking at the spec sheets. There's no noise figures! Would anyone happen to know where I could fine that info? Or maybe someone who's already done some testing to get that that answer? Or am I wasting my time looking because they aren't that good? (Jk)
I think you need to provide a few details. What devices or family of devices are you investigating? Maybe a link? Application?
Hehe my bad
https://toshiba.semicon-storage.com...ics/automotive-audio-power-amplifier-ics.html
As for application, I'm making a small amp for a ribbon tweeter in an active setup. The bass/mid drivers will be class D, but I'm not quite sure yet about the tweeter. I was thinking of maybe just going AB since its only about 50 watts maybe less. Was thinking about using the LM3886 like Tom over at neurochrome does with his, bit I figured I would look around first. I know Toshiba makes good discrete components so I figured I would take a look and here we are.
I found the DS for TB2904 which says 90uVRMS output noise. So not great. TCB702FNG says 60uV so slightly better. NXP and ST provide lower noise (just from memory) and more info in their DSs.
Big oof. Well I guess they're a dead end. Guess I'm going with a LM3886 (a pair technically for differential).
https://www.semico.co/uploads/IC/TB2904HQ.pdf
90 uV RMS (20 Hz to 20 kHz) is about 1 nW into 8 ohm, 2 nW into 4 ohm. With an 8 ohm loudspeaker with a sensitivity of 90 dB at 1 W, 1 m, it's 0 dB SPL at 1 m in free-field conditions. Not great, but not awful either.
The distortion graphs on pages 10 and 12 don't look good at high audio frequencies: 0.3 % distortion at 10 kHz, 1 W for example.
90 uV RMS (20 Hz to 20 kHz) is about 1 nW into 8 ohm, 2 nW into 4 ohm. With an 8 ohm loudspeaker with a sensitivity of 90 dB at 1 W, 1 m, it's 0 dB SPL at 1 m in free-field conditions. Not great, but not awful either.
The distortion graphs on pages 10 and 12 don't look good at high audio frequencies: 0.3 % distortion at 10 kHz, 1 W for example.
H
HAYK
Marcel, have you ever heard of class SB and TB?
https://toshiba.semicon-storage.com...ics/automotive-audio-power-amplifier-ics.html
https://toshiba.semicon-storage.com...ics/automotive-audio-power-amplifier-ics.html
No, I haven't. They describe it as
KB: Knitted BTL(Bridge Tied Load)
TB: Tied BTL(Bridge Tied Load)
https://fiberartspgh.org/about/outreach/knit-the-bridge/
KB: Knitted BTL(Bridge Tied Load)
TB: Tied BTL(Bridge Tied Load)
https://fiberartspgh.org/about/outreach/knit-the-bridge/
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