iHP Manual 78 | P a g e
Vo (VREF) is above the nominal voltage, Latch Level value is automatically reduced to maintain the supply
within the maximum peak power of the module
Latch Current Level = [ (Pnominal) * (OC_FAULT_LIMIT_MULTIPLIER)] / VREF
Note that the latch setting level will NOT be reflected to IREF (Module Command B2h). Latch level can be
determined by computation as stated above.
4.5.1.1.2 AVS Short Circuit Protection
When 52h is set to Constant Current Response, the module will shut down when Vo is approximately less than
4% of the nominal for 2 seconds or more. A fault status will be reported.
When 52h set to Latch Type and an output short circuit occurs, the current level should exceed the latch
current level and the module will shut down. A fault status will be reported.
4.5.1.1.3 AVS Protection Over Voltage Protection (OVP)
Tracking over voltage protection Module Command 48h (OV_FAULT_LIMIT_MULTIPLIER) is not operational
during AVS. A Brick Wall OVP is operational during this mode. In Brick Wall OVP mode the limit is hard coded
in module firmware at the factory and cannot be changed. The module will shut down when the output
voltage reaches the Brick Wall OVP level. Brick Wall OVP level is specified in Section 4.1.2 and a fault status will
be reported.
4.5.1.1.4 AVS Protection Under Voltage Protection (UVP)
During ACS operating mode, under voltage protection is not functional.
4.5.2 Analog Current Source (ACS)
In this operating mode, the user has the capability to control the output current using analog means. For ACS,
the user can control the output using 0-5VEXT_IPROG or 0-10VEXT_IPROG
To change to Analog Current Source (ACS) mode, the user needs to send below commands to ISOCOMM.
*Before writing to the ISOCOMM, please ensure that the ISOCOMM Command Write Protect (01h) is disabled.
Where: Data1 please refer to ISOCOMM Command Table.
Data2 “0x0Ah” signifies Analog Programmed Voltage Source.
After sending ISOCOMM Command D3h, the module will momentarily shutdown, re-initialize and restart. The
shutdown, re-initialize and restart process takes approximately 1.5 seconds. Since the module will re-initialize,
the Module Operational Command (01h) and Module Write Protect Command (10h) will be set to enable. The
module output current will be based on the IPROG signal.
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