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Old 1st August 2012, 04:15 PM   #2151
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BD139 BD140 low ampere 1,5A BD911 NPN 15A BD912 PNP 15A

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Old 2nd August 2012, 10:23 PM   #2152
stewin is offline stewin  Kenya
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are those with hi amperes needed ? iraud 9 uses 600ma to drive irfb4227 4 pairs.
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Old 2nd August 2012, 10:25 PM   #2153
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are those with hi amperes needed ? iraud 9 uses 600ma to drive irfb4227 4 pairs.
The irs2092 will output 1.5 amps and I couldnt get it to drive 4 irfb4227 without the chip resetting. In fact it struggled with one pair.
To get it to work I had to add npn/pnp gate buffer BD243/BD244.
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Old 3rd August 2012, 01:38 AM   #2154
stewin is offline stewin  Kenya
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so tip 41 and tip 42 can do well i believe they have high amps.
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Old 3rd August 2012, 08:20 PM   #2155
stewin is offline stewin  Kenya
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guys is it o.k to use tip41 and tip42 in the totem pole gate buffer ??
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Old 3rd August 2012, 10:35 PM   #2156
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guys is it o.k to use tip41 and tip42 in the totem pole gate buffer ??
Try, 2SB772/2SD882 instead of BD139/140.
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Old 4th August 2012, 01:14 AM   #2157
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pls look also the bandwidth of those bjt not only the current capability ..pls correct me if im wrong
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Old 4th August 2012, 08:19 AM   #2158
stewin is offline stewin  Kenya
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hi whortless

which is the best transistor to use as buffer in totem pole . to drive 4 pairs irfb 4227 or irfp250 or irfp264 or (irf640 6pairs)?? will the 2SB772/2SD882 work or there is a better pair.

Last edited by stewin; 4th August 2012 at 08:39 AM.
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Old 4th August 2012, 07:13 PM   #2159
paskal9 is offline paskal9  Malaysia
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Originally Posted by thienchay View Post
I'm used IRFP460 , schottky Diode is better , and R gate i using 22 ohm
Sorry All , diode boostrap is FR207 or Diode has Vrrm >= Vcc .
And this is my last check .
hi thienchay. have you built the irs900 pcb? seems that the pcb is different from the schematic at the cd4049 chip.

the pinout for the cd4049 chip is messed up at your pcb and at the original pcb from detex. anyone have successfully built the irs900d?
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Old 4th August 2012, 07:31 PM   #2160
exflaco is offline exflaco  Armenia
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Dont forget the lower conextion the gnd from v rails to the gnd input (single wire)
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