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Old 25th September 2004, 04:08 PM   #1
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Default The "not so lowly" TL431

Interesting, in the current issue of "SwitchingPower" magazine, Dr. Riddley has a lengthy article on the popular and cheap (not inexpensive, cheap !!!) TL431 adjustable reference. The conclusion is that it will work quite well as an error amplifier cum reference (and a good low noise reference at that.) Riddley suggests several compensation methods which will result in very good performance.

These parts cost about a dime apiece !
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Old 25th September 2004, 05:44 PM   #2
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This is no great secret - the TL431 (and its earlier incarnation, the TL430) have been used as error amp/references by the power supply industry for over 20 years. Hardly anyone uses them for their original intended application.
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Old 25th September 2004, 08:36 PM   #3
jcarr is offline jcarr  United States
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Older thread along similar lines:

4-part Harmony, a 9 watt class A amp using a voltage regulator IC.

regards, jonathan carr
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Old 25th September 2004, 08:44 PM   #4
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jackinnj, what was your point?

BTW: I have it in a fairly new design with power factor correction and all. It (the LM431) works pretty good as a comparator/voltage level sensing element. Switching frequency 100-200 kHz (don't know exactly).
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Old 25th September 2004, 09:12 PM   #5
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the point -- Ridley goes on to describe the compensation scheme for optimal performance when using optical isolation.
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Old 26th September 2004, 01:02 AM   #6
paulb is offline paulb  Canada
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There is an elegant design for a soft-start circuit using the TL431 as the only active element in the latest AudioXpress magazine. When the input voltage via an RC exceeds the reference voltage, the output pulls down a relay to ground.
It's also in the TL431 datasheet, Fig. 27.
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Old 27th September 2004, 02:15 AM   #7
jaycee is offline jaycee  United Kingdom
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I've also seen the TL431 used as a bias servo, look up the Stochino amplifier. He uses it to set bias along with 4 BD139's in diode configuration as a thermal sensor.
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