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Old 12th March 2012, 10:57 AM   #1781
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so does it means using irfb4227 is not good choice for ir2110/2113?
Sorry for asking im just newbie on this class d thingy
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Old 12th March 2012, 11:54 AM   #1782
Dimonis is offline Dimonis  Russian Federation
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Quote:
Originally Posted by irvynejay View Post
so does it means using irfb4227 is not good choice for ir2110/2113?
Sorry for asking im just newbie on this class d thingy
Only single , not parallel , don't exceed 300kHz running frequency.
Better 2xIRFB5620 in parallel ~= 1xIRFB4227
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Old 12th March 2012, 12:10 PM   #1783
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thanx Dimonis for your guidance
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Old 12th March 2012, 06:50 PM   #1784
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nice goind Irvy , did u put any protection for your full bridge version? ovp, uvp, ocp?
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Old 13th March 2012, 01:42 AM   #1785
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thanx norazmi,,no any protection you can share for newbies ?
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Old 13th March 2012, 04:45 AM   #1786
norazmi is offline norazmi  Malaysia
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yup why not , i`ll put schema here for the protection, take it from iraudump 7D OVP, UVP and OTP, for short circuit we can use ne555 timer u can take it from classdfromru website refer to ucd2.5 .
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Old 13th March 2012, 05:37 AM   #1787
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Default PROTECTION SCHEMATICS

Hi Norazmi
greetings that would be nice protection schematics
warm regards
andrew lebon
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Old 13th March 2012, 07:29 AM   #1788
norazmi is offline norazmi  Malaysia
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here is the schema, D1 is zener diode to set maximum voltage for your amp, and D2 is zener diode to set minimum voltage for your amp. TH001 thermistor 2.2k directly put on heatsink for thermal protection.
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File Type: pdf d-amppro.pdf (6.1 KB, 417 views)
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Old 13th March 2012, 07:33 AM   #1789
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Hi All

The importance of the gate charge data to the designer is illustrated
as follows. Taking the charge are required to switch a previous
example, about 15 nanocoulombs of gate if 1.5 amps is supplied to the
gate, the device will be drain voltage of 80 volts and a drain current
of 12 amps. Since the 15 nC gate charge is the product of the gate
input current and the switching time, switched in 10 nS. It follows
that if 15 mA is supplied to the gate, then switching occurs in 1 us,
and so on. These simple calculations immediately tell the designer the
trade-offs between the amount of current available from the drive
circuit and the achievable switching time. With gate charge known,
the designer can develop a drive circuit appropriate to the switching
time required.
Consider a typical practical example of a 100 kHz switcher, in which
it is required to achieve a switching time of 100 nanoseconds.The required gate drive current is derived by simply dividing the gate charge, 15 X 10
-9
, by the required switching time, 100 X
10
-9
, giving 150 mA. From this calculation, the designer can further arrive at the drive circuit impedance. If the drive circuit
applies 14 volts to the gate, for instance, then a drive impedance of about 50 ohms would be required.
Link: http://www.electro-tech-online.com/c.../08/an-944.pdf
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Old 13th March 2012, 08:01 AM   #1790
manojtm is offline manojtm  India
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Hi all
thanks to the ref.
IR2110 can drive 2nos of IRFP250N(Qg=140) 3nos of IRFP240 & IRFP4227 (Qg=70 minimum)

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