l
No minimum external capacitance requirement.
l
Supports local or remote sensing.
DCDC_20UF Mode
DCDC_20UF mode with capacitance applies for DC/DC converter applications where bus regulation is
implemented. This requires a minimum 20uF external capacitance. This is the only compensation
mode that can handle bus regulation for DC/DC converters. The following are the key operating
characteristics of DCDC_20UF mode with capacitance:
l
Recommended for DC/DC converter and MPPT applications.
l
Optimized for operation above Vmp when the DUT has a constant power input impedance char-
acteristic, such as converters providing bus regulation.
l
Also recommended for DUTs with constant voltage, current, or resistance input impedance char-
acteristics, such as converters providing MPPT tracking at any voltage on the SAS curve. For these
characteristics, operation is allowed at any voltage on the SAS curve.
l
Requires a minimum of 20 μF external capacitance at the sense point.
l
Require remote sensing. In addition, capacitance that is separated from the sense point by a series
diode does not contribute to the 20 μF minimum.
SHUNTSW Mode
The following are the key operating characteristics of SHUNTSW mode:
l
Optimized for shunt switching operation where the output terminal voltage alternates between two
steady levels, one of which is around zero volts.
l
No minimum external capacitance requirement.
l
Recommended for shunt switching applications, only.
l
If the DUT is a constant power load, Vmp/Imp must be greater than or equal to 5 ohms.
l
Supports local or remote sensing.
Specify the Compensation
Specify the compensation mode as follows:
Application DEFAULT DCDC_20UF SHUNTSW
Initial turn-on/debug of MPPT and shunt switching
DUTs with no external capacitance required
Recommended Not recommended Not recommended
Performance testing of MPPT DUTs with a minimum
of 20 μF external capacitance
Recommended Recommended Not recommended
Performance testing DC to DC regulation DUTs with a
minimum of 20 μF external capacitance
Not recommended Recommended Not recommended
Performance testing of shunt switching DUTs Not recommended Not recommended Recommended
Note that changing the curve compensation turns the channel's output off.
4 Using the Modular Power System
78 Keysight MP4300 Series Operating and Service Guide
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