so does it means using irfb4227 is not good choice for ir2110/2113?
Sorry for asking im just newbie on this class d thingy
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
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 .
PROTECTION SCHEMATICS
Hi Norazmi
greetings that would be nice protection schematics
warm regards
andrew lebon
Hi Norazmi
greetings that would be nice protection schematics
warm regards
andrew lebon
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.
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/custompdfs/2010/08/an-944.pdf
Regards
Manoj
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/custompdfs/2010/08/an-944.pdf
Regards
Manoj
Hi all
thanks to the ref.
IR2110 can drive 2nos of IRFP250N(Qg=140) 3nos of IRFP240 & IRFP4227 (Qg=70 minimum)
Regards
Manoj
thanks to the ref.
IR2110 can drive 2nos of IRFP250N(Qg=140) 3nos of IRFP240 & IRFP4227 (Qg=70 minimum)
Regards
Manoj
Hi Manoj
Yes it can , but it'll overheat
😀
The DIP package can dissipate more power that the SOIC one
Yes it can , but it'll overheat
😀The DIP package can dissipate more power that the SOIC one
Attachments
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.
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.
Attachments
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.
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.
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
Regards
Manoj
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
Regards
Manoj
Manoj
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.
Regards
Dmitri
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.
Regards
Dmitri
What power supply do you have ?
What output power do you expect , what load?
P.S. My standart is 50 hertz 😀
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.
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
Discrete UCD Class D amp with totem pole still half bridge with 4 pcs mosfet (2 pair) / channel - YouTube