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Old 13th March 2012, 07:29 AM   #1791
Dimonis is offline Dimonis  Russian Federation
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Hi Manoj
Quote:
Originally Posted by manojtm View Post

IR2110 can drive 2nos of IRFP250N(Qg=140) 3nos of IRFP240 & IRFP4227 (Qg=70 minimum)
Yes it can , but it'll overheat
The DIP package can dissipate more power that the SOIC one
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Old 13th March 2012, 07:50 AM   #1792
Dimonis is offline Dimonis  Russian Federation
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I already posted the graphs from 2110 datasheet
Maybe you missed them?
They are for a IRFPE50 with it' 150 nC total gate charge at 15V at gate.
How you can see the SOIC can heats up to 100 degrees at 300KHz , i think it's too much IMHO
Yes , it can sustain more (up to 150Deg) but it's too critical.
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Old 13th March 2012, 08:09 AM   #1793
Dimonis is offline Dimonis  Russian Federation
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I use IRS2110S (soic) with IRFB4115 (similar to 4227 dinamic parameters) for subwoofer amps at freq. around 200-250 kHz and have the temperature of the IC about 75-80 degrees.
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Old 13th March 2012, 10:25 AM   #1794
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Hi,Sir Dimonis good day,any recommendation of class d amp. for full range application? using linear power supply(standard 60 hertz transformer) any schematic's to share with,thank's in advance.
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Old 13th March 2012, 01:23 PM   #1795
manojtm is offline manojtm  India
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Dimonis

posted above ref: said that Qg*10^-9 / fq.time(ns) * 10^-9

ie. if use osc=125KHz,IRFP250 (Qg=140nC) then

125KHz is 8uSec. so 8000ns is it right??? should not 125ns

140/8000 = 0.0175A
R=E/I 12V/0.0175 = 686 ohm @680 ohm

please clarify

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Manoj
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Old 13th March 2012, 01:31 PM   #1796
manojtm is offline manojtm  India
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Dimonis

125Khz = 4us+4us

140/4000 = .035A
R=330 Ohm

is it right???

RGDS
Manoj
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Old 13th March 2012, 05:51 PM   #1797
Dimonis is offline Dimonis  Russian Federation
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Manoj
Quote:
Originally Posted by manojtm View Post

is it right???

I don't really know
We are speaking of two independent things , the capability of driving due-to Qgate vs. Iout (your opinion) and Qgate vs. Temperature IC.
The Appnote that you mentioned is only a guide /theoretical layout how to design the gate drive on an ideal and not on a specific IC.
If you put a good heatsink on IR2110 , a really good one , maybe it'll be "ideal" and your calculations will be right.
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Dmitri
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Old 13th March 2012, 05:58 PM   #1798
Dimonis is offline Dimonis  Russian Federation
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Quote:
Originally Posted by don2007ksa View Post
Hi,Sir Dimonis good day,any recommendation of class d amp. for full range application? using linear power supply(standard 60 hertz transformer) any schematic's to share with,thank's in advance.
What power supply do you have ?
What output power do you expect , what load?

P.S. My standart is 50 hertz
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Old 14th March 2012, 09:59 AM   #1799
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Dimonis i have 60 hertz,+/- 90 VOLTS @ 800 watts power transformer,i'm going to used a 4 ohm's load around 700watt's full range speaker,thank's.
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Old 14th March 2012, 12:50 PM   #1800
norazmi is offline norazmi  Malaysia
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Discrete with 2 pair mosfet hihihi

Discrete UCD Class D amp with totem pole still half bridge with 4 pcs mosfet (2 pair) / channel - YouTube
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