Brian,
A lower soldering time option for the transistors is the TD62084, which has
eight 50V transistors in a 18 pin DIP or TSSOP. The SN75468 has seven 100V
transistors in a 16 pin DIP.
Other than that, it looks like it will work, as long as you have a guarantee
that your boost converter FET gate will not be enabled for longer than a few
microseconds incase the CPU goes stupid.
There is a story about that - the folks who beat the roulette wheel using
physics (read The Eudaemonic Pie) built a computer in a bra, but the tapping
solenoids that communicated to the wearer would stay engaged when the CPU
crashed. Hot! Ouch! A series capacitor and a pulldown resistor on the
transistor's input solved that problem.
On 6/9/2015 2:23 PM, Brian wrote:
Thanks for letting me know that parts exists. I didn't know they were
making combo parts like that. I will probably stick with the design I have
for now...Newark has the BSS131 on sale for $0.063, and the 74HC595 on sale
for $0.066, which means 32-bits of output costs $2.28. The lowest price I
could find for the HV5522 was $5.53, though I guess the cost is made up in
solder time :-).
(I also already have the 24V adapter and no 12V rail.)
Thanks for the comments, you should post your preliminary design too!
-Brian
On Tuesday, June 9, 2015 at 4:52:53 PM UTC-4, gregebert wrote:
Others have used the HV5522 (I'm designing with the HV5530) because it
combines the shift-register with the HV driver. The only drawback is that
you have to level-shift the inputs to the HV55xx to 12V. I'm using
comparators for that; have yet to run spice simulations to optimize for
noise-rejection, etc.
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