iHP Manual 4 | P a g e
4.2.2.3.4 5V Housekeeping Bias ......................................................................................................... 60
4.2.2.4 LAN RESET BUTTON ................................................................................................................... 60
4.2.2.5 LAN STATUS LED ........................................................................................................................ 60
4.2.2.6 DSUB9 Port ................................................................................................................................ 60
4.2.2.6.1 5V Housekeeping Bias ......................................................................................................... 61
4.2.2.6.2 5V Housekeeping Bias Return ............................................................................................. 61
4.2.2.6.3 Global Inhibit/Enable Logic “1” ........................................................................................... 61
4.2.2.6.4 Global Inhibit/Enable Logic “0” ........................................................................................... 62
4.2.2.6.5 ACOK Signal “Power Fail” (Uncommitted Transistor) ......................................................... 63
4.2.2.6.6 DCOK Signal “Output Fail” (Uncommitted Transistor) ........................................................ 63
4.3 Module Operating Mode ...................................................................................................................... 64
4.4 Digital Control ....................................................................................................................................... 65
4.4.1 Digital Voltage Source (DVS) ............................................................................................................. 65
4.4.1.1 DVS Protection Modes .............................................................................................................. 67
4.4.1.1.1 DVS Protection Over Current Response .............................................................................. 67
4.4.1.1.2 DVS Short Circuit Protection ............................................................................................... 68
4.4.1.1.3 DVS Protection Over Voltage Protection (OVP) .................................................................. 68
4.4.1.1.4 DVS Protection Under Voltage Protection (UVP) ................................................................ 68
4.4.2 Digital Current Source (DCS) ............................................................................................................. 69
4.4.2.1 DCS Protection Modes .............................................................................................................. 70
4.4.2.1.1 DCS Protection: Constant Voltage Clamp ........................................................................... 70
4.4.2.1.2 DCS Protection: Over Current Response and Short Circuit Protection ............................... 70
4.4.2.1.3 DCS Protection: Over Voltage Protection (OVP) ................................................................. 71
4.4.2.1.4 DCS Protection: Under Voltage Protection (UVP) ............................................................... 71
4.4.3 Module Grouping for Series or Parallel Connection Digital Operation ............................................. 71
4.4.3.1 DVS Parallel Connection ............................................................................................................ 71
4.4.3.1.1 DVS Parallel Connection Protection .................................................................................... 72
4.4.3.2 DVS Series Connection .............................................................................................................. 72
4.4.3.2.1 DVS Series Connection Protection ...................................................................................... 74
4.4.3.3 DCS Parallel Connection ............................................................................................................ 74
4.4.3.3.1 DCS Parallel Connection Protection .................................................................................... 74
4.5 Analog Control....................................................................................................................................... 75
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