#12, M1S: Low-Power +/–15V Power Supply, 5V Input
Function: Low-power non-isolated power supply with +15/–15V output, 5V input, shutdown control
Form factor: M1S
Category: Power supply module
Special needs: ---
Power requirements: 5V/230mA + curr * 4.5 (curr is the combined current consumed on +15V and –15V outputs)
See also: #09, #10, #13, #14, #23, #25, #33
Details
This Tibbit can generate up to 15mA of +15V power and –15mA of –15V power from the main 5V supply rail. This Tibbit, therefore, does not rely on outside power, but instead generates +/–15V from the internal main power of the host Tibbo Project System (TPS). The diagram in Tibbit Power Lines actually shows Tibbit #12 and its "power relationship" with other Tibbits. Multiple Tibbits #12 can be used to increase the available +/–15V current budget.
This module is required for the correct operation of Tibbits #13 (ADC) and #14 (DAC).
Tibbit #12 has a base (idle) power consumption of 230mA. Each additional 1mA of current consumed on the +15V and –15V outputs results in 4.5mA of extra power drain on the 5V input. This 4.5 ratio is explained by the threefold difference in the input (5V) and output (15V) voltages, as well as associated power conversion losses.
This module has a dedicated shutdown (–SDWN) line. Pull the line LOW to disable this Tibbit.
LEDs
There are two red and two green LEDs. The first red LED is connected to the +5V input. The second red LED is connected to the –SDWN line and lights up when the line is LOW (i.e., when the module is shut down). The green LEDs are +15V and –15V power indicators.
* "Mates" in this case means "doesn't mind them close," as this device requires no connector Tibbits for its operation.