tl431 led - results edaboard.com

linear led driver oscillates at 20mhz

hello,the following is a linear led driver that runs off a 13.5v battery......http://i26.tinypic.com/29o0kkp.jpghttp://i26.tinypic.com/29o0kkp.jpgq8 and q7 turn the whole lamp off if some of the leds fail open.the lmv431 gives current regulation......
Analog Circuit Design :: 10 Aug 2009 18:06 :: FvM :: Replies: 5 :: Views: 318

feedback problem using tl431 and opt-coupler (updated)

i use tl431 and opt-coupler for my full bridge converter feedback control, but my output voltage is about 200v, if i use voltage divider (200v to 30v for feedback), it does not work.if vout=200v, vcontrol drop to 15v rather than 30v i think it needs ...
Professional Hardware and Electronics Design :: 27 Apr 2009 13:08 :: hsklkk :: Replies: 32 :: Views: 1761

tl431/opto feedback with flyback with/without clc filter

hello,basso’s book, page 290 gives the transfer function of the tl431/opto feedback network in a flyback converter as per the transfer function in the below diagram.*****diagram and transfer function of opto / tl431 feedback network.http://i42.tinypi...
Analog Circuit Design :: 05 Apr 2009 15:43 :: FvM :: Replies: 3 :: Views: 1428

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tl431 use in smps

the tl431 often use in control loop for smpshow to calculate its feedback bandwidth?...
Analog Circuit Design :: 24 Feb 2009 12:07 :: FvM :: Replies: 10 :: Views: 1560

type 3 compensation in smps with opto

hellodoes anybody know how i can model a 4n35 opto coupler for use in an offline smps feedback control circuit ?it is a one transistor forward converter and i need to use type 3 compensation.4n35 datasheet:-http://www.datasheetcatalog.org/datasheet2/...
Professional Hardware and Electronics Design :: 20 Jan 2009 20:13 :: eem2am :: Replies: 3 :: Views: 942

constant current smps

hello,i am doing isolated , offline, one transistor forward converter for ~10 w output.i have a valley fill circuit after the diode bridge so my input dc bus ripples from 170v to 340 v.the secondary is set up to provide a constant current of 1 amp si...
Analog Circuit Design :: 11 Dec 2008 19:24 :: eem2am :: Replies: 12 :: Views: 2004

please tell about this circut

dear all,please see attached file and tell me what is the work of q1 and q2 in this circuit. many times i made smps designs but never seen this cofiguration in opto bias.please tell me what is need of this circuit in smps.thanks...
Analog Circuit Design :: 27 Aug 2008 12:53 :: Eugen_E :: Replies: 1 :: Views: 132

tl431 usage

hi i am trying to get a tl431 voltage shunt regulator to work without luck and wonder if anyone can help me ( i know little about electronics but until now thought i can read circuit diagrams.....)the circuit is a built like the reference circuit in ...
Professional Hardware and Electronics Design :: 06 Feb 2008 6:36 :: GUGLHUPF :: Replies: 5 :: Views: 474

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