User:Chotee/constantCurrentSink: Difference between revisions
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Created page with "= Constant Current Sink = Goal: Will sink a constant current independent of the input voltage. Range: 1mA to 5000mA. Max Vin 30V. = Ref 1 Build Notes = == Errata == * R1..." |
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= Ref 1 Build Notes = | = Ref 1 Build Notes = | ||
== Adjustment == | |||
# RV5 (reference voltage adjust) to 5V. Test point at P3. | |||
# Set SW_A1 to non-EXT value | |||
# RV1 (100mV voltage) to 100mV. Use SW2_B1 bottom pin as test point | |||
# RV2 (10mV voltage) to 10mV. Use SW2_B1 next to bottom bin as test point | |||
== Errata == | == Errata == | ||
Revision as of 21:30, 14 June 2015
Constant Current Sink
Goal: Will sink a constant current independent of the input voltage.
Range: 1mA to 5000mA. Max Vin 30V.
Ref 1 Build Notes
Adjustment
- RV5 (reference voltage adjust) to 5V. Test point at P3.
- Set SW_A1 to non-EXT value
- RV1 (100mV voltage) to 100mV. Use SW2_B1 bottom pin as test point
- RV2 (10mV voltage) to 10mV. Use SW2_B1 next to bottom bin as test point
Errata
- R15 @ 10K: Doesn't give enough current to the LM336Z5.0. Switch to a lower resistance, 3k9 works for 9v input but. If 9v battery is used, voltage will droop till 7v during battery life. R15=1k5 will give stable reference 5V with a Vbat of 9V5 to 7V. Quiescent current does go up, but usable battery life will still be longer.