In SX Microcontrollers, SX/B Compiler and SX-Key Tool, SteveW wrote:

Could it be that the floating pins on the SX during programming cause the pushpull modules to go half-on, causing them to sink current from the 18V?
4K7 pulldown resistors to ground on the appropriate SX pins would discourage this behaviour. 
(Post a schematic, or specs on the drivers, for better advice)

Steve

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