High current driver IC

Hello!

I need to drive LOTS (50+) of 12v 5w light bulbs from a
microcontroller. I've been looking into several quad and octal
transistor arrays and driver IC's, but they all seem to have a problem
driving high currents when all outputs are used. I need a minimum of
500mA at each channel

Any suggestions? Or am i forced to use single mosfets?


Thanks in advance,
LT

 

[Lostgallifreyan]

larstore@gmail.com wrote in news:c3364aca-3177-4a56-8bd5-
e47235046d00@q9g2000yqc.googlegroups.com:

Hello!

I need to drive LOTS (50+) of 12v 5w light bulbs from a
microcontroller. I've been looking into several quad and octal
transistor arrays and driver IC's, but they all seem to have a problem
driving high currents when all outputs are used. I need a minimum of
500mA at each channel

Any suggestions? Or am i forced to use single mosfets?


Thanks in advance,
LT

Any chance of strobing (multiplexing) the outputs? That way you could use a
higher voltage at high frequency so the output device sees a lower average
current, and you can let the lamps integrate the pulsed supply so they see an
average that is appropriate for them.

 

[Dirk Ruth]

larstore@gmail.comschrieb:
"

Hello!

I need to drive LOTS (50+) of 12v 5w light bulbs from a
microcontroller. I've been looking into several quad and octal
transistor arrays and driver IC's, but they all seem to have a problem
driving high currents when all outputs are used. I need a minimum of
500mA at each channel

Any suggestions? Or am i forced to use single mosfets?

http://85.21.193.200/pdf/INFIN/TLE6230.pdf


Dirk

 

[Clint Sharp]

In message
<c3364aca-3177-4a56-8bd5-e47235046d00@q9g2000yqc.googlegroups.com>,
larstore@gmail.com writes

Any suggestions? Or am i forced to use single mosfets?
Watch the wrap.

Http://www.mitsubishichips.com/Global/common/cfm/eProfile.cfm?FOLDER=/pro
duct/power/transistorarray/tarray/tarray

http://www.allegromicro.com/en/products/categories/Sanken/Transistor_and_
MOSFET_Arrays/index.asp

Thanks in advance,
LT

--
Clint Sharp

 

Hmm, I like the idea of using SPI to control the devices. This way i
could use a lower pin count uC, and daisy chain several devices..

I am now looking at the Freescale MC33880
http://www.freescale.com/files/analog/doc/data_sheet/MC33880.pdf?fsrch=1

This way i could high-side switch 8 devices per chip. But im still not
sure if it will handle 500mA on each output with all outputs enabled..
Any experiences?


Thanks,
LT



On 14 Mar, 10:19, Clint Sharp <cl...@clintsmc.demon.co.uk> wrote:

In message
c3364aca-3177-4a56-8bd5-e47235046...@q9g2000yqc.googlegroups.com>,
larst...@gmail.com writes>Any suggestions? Or am i forced to use single mosfets?

Watch the wrap.

Http://www.mitsubishichips.com/Global/common/cfm/eProfile.cfm?FOLDER=/pro
duct/power/transistorarray/tarray/tarray

http://www.allegromicro.com/en/products/categories/Sanken/Transistor_...
MOSFET_Arrays/index.asp



Thanks in advance,
LT

--
Clint Sharp

 

[JosephKK]

On Sun, 15 Mar 2009 06:21:20 -0700 (PDT), larstore@gmail.com wrote:

Hmm, I like the idea of using SPI to control the devices. This way i
could use a lower pin count uC, and daisy chain several devices..

I am now looking at the Freescale MC33880
http://www.freescale.com/files/analog/doc/data_sheet/MC33880.pdf?fsrch=1

This way i could high-side switch 8 devices per chip. But im still not
sure if it will handle 500mA on each output with all outputs enabled..
Any experiences?


Thanks,
LT



On 14 Mar, 10:19, Clint Sharp <cl...@clintsmc.demon.co.uk> wrote:
In message
c3364aca-3177-4a56-8bd5-e47235046...@q9g2000yqc.googlegroups.com>,
larst...@gmail.com writes>Any suggestions? Or am i forced to use single mosfets?

Watch the wrap.

Http://www.mitsubishichips.com/Global/common/cfm/eProfile.cfm?FOLDER=/pro
duct/power/transistorarray/tarray/tarray

http://www.allegromicro.com/en/products/categories/Sanken/Transistor_...
MOSFET_Arrays/index.asp



Thanks in advance,
LT

--
Clint Sharp

I suppose that you could always use 1.5 A or higher rated devices.

Possibly M63850P/FP from the first link or
SLA4030 or SLA4070 from the second link.
.