| Author |
Message |
kell
Guest
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 Posted:
Mon Nov 14, 2005 9:35 am Post subject:
IR2153 |
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http://www.irf.com/product-info/datasheets/data/ir2153.pdf
I tried to use the IR2153 to run a half bridge using two n-channel
mosfets as in the circuit diagram on the first page of the data sheet,
and it didn't work.
I discovered that HO only sinks, it does not source.
LO works; it sources and sinks, and the cap for Vb does take a charge.
I found this out by slowing the timing down to about one hertz and
using grain-of-wheat lamps to see what the outuputs were doing.
Same thing happened with both chips that I tried.
Has anyone used the IR2153, and what do you have to do to get the high
side drive to work?
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John - kd5yi
Guest
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| Posted:
Mon Nov 14, 2005 5:35 pm Post subject:
Re: IR2153 |
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"kell" <kellrobinson@billburg.com> wrote in message
news:1131949659.303637.50620@o13g2000cwo.googlegroups.com...
| Quote: | http://www.irf.com/product-info/datasheets/data/ir2153.pdf
I tried to use the IR2153 to run a half bridge using two n-channel
mosfets as in the circuit diagram on the first page of the data sheet,
and it didn't work.
I discovered that HO only sinks, it does not source.
LO works; it sources and sinks, and the cap for Vb does take a charge.
I found this out by slowing the timing down to about one hertz and
using grain-of-wheat lamps to see what the outuputs were doing.
Same thing happened with both chips that I tried.
Has anyone used the IR2153, and what do you have to do to get the high
side drive to work?
|
According to the diagrams on page 6, both outputs are source/sink.
Something else is wrong.
Good luck.
John |
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Winfield Hill
Guest
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| Posted:
Mon Nov 14, 2005 5:35 pm Post subject:
Re: IR2153 |
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cbarn24050@aol.com wrote...
| Quote: |
kell wrote:
http://www.irf.com/product-info/datasheets/data/ir2153.pdf
I tried to use the IR2153 to run a half bridge using two n-channel
mosfets as in the circuit diagram on the first page of the data sheet,
and it didn't work.
I discovered that HO only sinks, it does not source.
LO works; it sources and sinks, and the cap for Vb does take a charge.
I found this out by slowing the timing down to about one hertz and
using grain-of-wheat lamps to see what the outuputs were doing.
Same thing happened with both chips that I tried.
Has anyone used the IR2153, and what do you have to do to get the
high side drive to work?
Its not going to work at 1 Hz. You need a high speed diode in the
circiut a !N4001 wont do.
|
It works fine at 1Hz, or at DC, if a separate floating power supply
is created for the HI-side driver section. A few years ago I posted
the schematic of a high-speed 250V 50-ohm pulse generator using this
approach with an IR2113, a chip with similar MOSFET drivers.
--
Thanks,
- Win
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Guest
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| Posted:
Mon Nov 14, 2005 5:35 pm Post subject:
Re: IR2153 |
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kell wrote:
| Quote: | http://www.irf.com/product-info/datasheets/data/ir2153.pdf
I tried to use the IR2153 to run a half bridge using two n-channel
mosfets as in the circuit diagram on the first page of the data sheet,
and it didn't work.
I discovered that HO only sinks, it does not source.
LO works; it sources and sinks, and the cap for Vb does take a charge.
I found this out by slowing the timing down to about one hertz and
using grain-of-wheat lamps to see what the outuputs were doing.
Same thing happened with both chips that I tried.
Has anyone used the IR2153, and what do you have to do to get the high
side drive to work?
|
Its not going to work at 1 Hz. You need a high speed diode in the
circiut a !N4001 wont do. |
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Jon
Guest
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| Posted:
Tue Nov 15, 2005 1:28 am Post subject:
Re: IR2153 |
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Kell,
A couple of things to check:
~
Are you matching the recommended values of Rt, Ct to your switching
frequency? Also the Voltage on the cap for Vb must be higher than Vs,
by an amount equal to or greater than gate threshold voltage of the FET
you are using.
Regards,
Jon |
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kell
Guest
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| Posted:
Tue Nov 15, 2005 1:35 am Post subject:
Re: IR2153 |
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kell wrote:
| Quote: | http://www.irf.com/product-info/datasheets/data/ir2153.pdf
I tried to use the IR2153 to run a half bridge using two n-channel
mosfets as in the circuit diagram on the first page of the data sheet,
and it didn't work.
I discovered that HO only sinks, it does not source.
LO works; it sources and sinks, and the cap for Vb does take a charge.
I found this out by slowing the timing down to about one hertz and
using grain-of-wheat lamps to see what the outuputs were doing.
Same thing happened with both chips that I tried.
Has anyone used the IR2153, and what do you have to do to get the high
side drive to work?
|
Thanks for the replies. I'll go into a little more detail.
At first I tried to run it with a .01 uF cap and a 10 k resistor for
the timing, to
drive a ferrite transformer, using rectified mains for power. I used a
MUR160 for the bootstrap diode. I had a 10 uF cap for the Vb/Vs cap.
I used IRF740 mosfets. I don't have a scope so when the circuit
wouldn't work I decided to check it out by bringing the timing down to
something I could check by eye with test lamps. I disconnected from
the high voltage and used a 12 volt battery for the test. I
connected little lamps from pin 6 to Vcc and ground and set the timing
to about 1 hz with an electrolytic cap and a 10 k resistor. The lower
mosfet worked, but not the upper. So I tested pin 7, which drives the
upper mosfet. It was sinking but not sourcing.
It is my understanding that the chip is supposed to provide its own
power for the high side because the Vb cap charges up every time the
lower mosfet turns on, and this provides power for the upper driver.
My test illustrated that this was happening. During the test I used a
680 uF cap. The cap took on a 12 volt charge.
I don't see why I should need a separate floating supply to make this
thing work. The cap is right there providing a floating power supply
for driving the upper mosfet. Something else is going on here.
I'm going to take another gander at the datasheet now. |
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Pooh Bear
Guest
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| Posted:
Tue Nov 15, 2005 9:35 am Post subject:
Re: IR2153 |
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Winfield Hill wrote:
| Quote: | cbarn24050@aol.com wrote...
kell wrote:
http://www.irf.com/product-info/datasheets/data/ir2153.pdf
I tried to use the IR2153 to run a half bridge using two n-channel
mosfets as in the circuit diagram on the first page of the data sheet,
and it didn't work.
I discovered that HO only sinks, it does not source.
LO works; it sources and sinks, and the cap for Vb does take a charge.
I found this out by slowing the timing down to about one hertz and
using grain-of-wheat lamps to see what the outuputs were doing.
Same thing happened with both chips that I tried.
Has anyone used the IR2153, and what do you have to do to get the
high side drive to work?
Its not going to work at 1 Hz. You need a high speed diode in the
circiut a !N4001 wont do.
It works fine at 1Hz, or at DC, if a separate floating power supply
is created for the HI-side driver section. A few years ago I posted
the schematic of a high-speed 250V 50-ohm pulse generator using this
approach with an IR2113, a chip with similar MOSFET drivers.
|
IR have an app note about providing a seperate hi side supply specifically
for low frequency operation. Uses a 555 IIRC.
Graham |
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kell
Guest
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| Posted:
Wed Nov 16, 2005 7:37 am Post subject:
Re: IR2153 |
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kell wrote:
| Quote: | http://www.irf.com/product-info/datasheets/data/ir2153.pdf
I tried to use the IR2153 to run a half bridge using two n-channel
mosfets as in the circuit diagram on the first page of the data sheet,
and it didn't work.
I discovered that HO only sinks, it does not source.
LO works; it sources and sinks, and the cap for Vb does take a charge.
I found this out by slowing the timing down to about one hertz and
using grain-of-wheat lamps to see what the outuputs were doing.
Same thing happened with both chips that I tried.
Has anyone used the IR2153, and what do you have to do to get the high
side drive to work?
|
This note from IR addresses the subject. I still haven't figured out
the problem. |
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kell
Guest
|
| Posted:
Wed Nov 16, 2005 7:40 am Post subject:
Re: IR2153 |
|
|
kell wrote:
| Quote: | kell wrote:
http://www.irf.com/product-info/datasheets/data/ir2153.pdf
I tried to use the IR2153 to run a half bridge using two n-channel
mosfets as in the circuit diagram on the first page of the data sheet,
and it didn't work.
I discovered that HO only sinks, it does not source.
LO works; it sources and sinks, and the cap for Vb does take a charge.
I found this out by slowing the timing down to about one hertz and
using grain-of-wheat lamps to see what the outuputs were doing.
Same thing happened with both chips that I tried.
Has anyone used the IR2153, and what do you have to do to get the high
side drive to work?
This note from IR addresses the subject. I still haven't figured out
the problem.
Oops, forgot to post the link |
http://www.irf.com/technical-info/designtp/dt04-4.pdf |
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