Confluence will be unusable 23-July-2024 at 06:00 due to a Crowd upgrade.
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| Photo | SENSOR HV | HV GND | AGND | P24V0A | DGND | P24V0D |
---|
Cable 01 - Board 38-C00-02
| | 0.6R | 0.7R | 0.4R | 0.4R | 0.3R | 0.3R |
---|
Initial power-up - only digital board
- Using Rhode & Schwarz HMP4030 power supply
- Only P24V0D connected to channel 2 of the supply
- Using board 38-C00-02
- Started with a current limit set to 10 mA
- Increased the current limit by 1 mA steps until the supply went out of constant-current mode
- This happened at around 130 mA
- Board is consuming 128.2 mA and is steady
- This is 3.08 W
- Lukewarm around the first stage DC/DC converter
- Set the current limit to 160 mA for now
- Test points:
- P5V0 EN = 2.179 V
- P5V0 = 4.988 V
- P0V85 = 0.852 V
- P0V9 = 0.906 V
- P1V2 = 0.103 V
- P1V8 = 0.031 V
- → This seems to indicate that the power sequencing is not working as intended
- The following enable signals must be > 1.3 V (Enable threshold voltage) for the DC/DC converter (TPSM5D1806) to enable its output:
- ENABLE_P0V9 (R53/R57) = 1.865 V → OK
- ENABLE_P1V2 (R70/R71) = 1.163 V → NOK
- ENABLE_P1V8 (R54/R58) = 1.163 V → NOK
- The issue is that the dividers R70/R71 and R54/R58 are essentially in parallel due to the 0R resistors R21 and R22
- → Remove one of the dividers
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