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Kepco has introduced an option (identified by suffix C) to optimize 200W and 400W BOP models for driving capacitive loads. This option makes the BOP more suitable for a wide variety of applications such as solar cell/solar panel testing, testing of piezoelectric driving devices, capacitor testing, driving and testing of capacitive transducers, and powering industrial- or lab-type applications with capacitive or capacitive-resistive loads.

For guidance concerning whether to choose the optimized BOP-L version vs the standard BOP when operating with a capacitive load, refer to Kepoc's Application Note BOP 004: When to Use BOP Standard or Optimized (L or C Suffix) to Drive Reactive Loads.

BOP C option units are designed to operate in a stable manner in Voltage or Voltage Limit mode for capacitive loads up to 10 millifarads. They are also stable with any R-C load combinations.

They are also stable when driving any R-C parallel combination where load R is > or = to nominal value and C is < or = to 10mF. Load R (nominal value) = nominal output Voltage/nominal output Current (e.g., BOP 36-6MC, R = 36/6 = 6 Ohms. To prevent current limit mode operation, the equivalent impedence of the R-C parallel load circuit must be greater than the nominal R value at the working frequency. Static specifications representing accuracy for various influence parameters are identical to the standard BOP models. Ripple and noise specifications are better (approximately 50% lower) for the C option units compared to the standard BOP.

Consult factory for single and multiple unit pricing. Delivery 4-6 weeks ARO.

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MODEL (1) Bandwidth (DC to f -3dB) Rise/Fall Time (3) Recovery at Step Load (4)
Resistive Load,
Load, 10µF (2)
BOP 20-5MC, DC
0 to 20V, 0 to 5A
12.1 KHz 15.5 KHz 42µS 45µS
BOP 100-1MC, DC
0 to 100V, 0 to 1A
2.2 KHz 3.5 KHz 165µS 185µS
BOP 20-10MC, DC
0 to 20V, 0 to 10A
7.8 KHz 13.7 KHz 45µS 137µS
BOP 36-6MC, DC
0 to 36V, 0 to 6A
7.0 KHz 8.5 KHz 50µS 183µS
BOP 50-4MC, DC
0 to 50V, 0 to 4A
11.5 KHz 15 KHz 35µS 100µS
BOP 100-2MC, DC
0 to 100V, 0 to 2A
2.0 KHz 2.6 KHz 175µS 575µS
BOP 20-20MC, DC
0 to 20V, 0 to 20A
4.8 KHz 5.3 KHz 75µS 225µS
BOP 36-12MC, DC
0 to 36V, 0 to 12A
7.8 KHz >10.3 KHz 45µS 136µS
BOP 50-8MC, DC
0 to 50V, 0 to 8A
11.5 KHz >15 KHz 35µS 100µS
BOP 72-6MC, DC
0 to 72V, 0 to 6A
6.5 KHz 8.3 KHz 60µS 184µS
BOP 100-4MC, DC
0 to 100V, 0 to 4A
5.0 KHz 6.7 KHz 70µS 228µS
(1) All specifications listed are for capacitive load models in Voltage Mode.
(2) Variations of the frequency response for the standard 10μF load create a larger 3-dB bandwidth than for a resistive load.
(3) 10% - 90%, with nominal resistive load.
(4) Load between infinity and nominal resistive values.
The unit is shipped with a user-wirable mating connector for the IEC 320 style recessed power inlet connector. Optional line cords are available as accessories.

In voltage mode the bandwidth of the C option BOP is reduced versus the standard model, while the response time is increased. Variations of the frequency response can be nearly eliminated by reducing the bandwidth in voltage mode in a predictable manner. This is done using one customer-installed capacitor in parallel with the internal compensation capacitance to increase the compensation capacitance.

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MODEL External Capacitor
(Added to internal compensation capacitance)
1nF 2.2nF 4.7nF 15nF 33nF 47nF 100nF
BOP 20-5MC, DC 11.5 KHz 8.5 KHz 5.6 KHz 2.9 KHz 1.4 KHz 1.1 KHz 0.52 KHz
BOP 100-1MC, DC 2.18 KHz 2.15 KHz 2.05 KHz 1.55 KHz 0.97 KHz 0.77 KHz 0.42 KHz
BOP 20-10MC, DC 7.0 KHz 5.5 KHz 4.6 KHz 2.3 KHz 1.2 KHz 1.0 KHz 0.5 KHz
BOP 36-6MC, DC 6.3 KHz 5.2 KHz 4.1 KHz 1.8 KHz 1.1 KHz 0.7 KHz 0.3 KHz
BOP 50-4MC, DC 11.0 KHz 9.0 KHz 7.0 KHz 3.0 KHz 1.5 KHz 1.0 KHz 0.5 KHz
BOP 100-2MC, DC 2.0 KHz 1.9 KHz 1.6 KHz 1.1 KHz 0.6 KHz 0.5 KHz 0.3 KHz
BOP 20-20MC, DC 4.6 KHz 4.4 KHz 3.2 KHz 1.3 KHz 0.7 KHz 0.6 KHz 0.5 KHz
BOP 36-12MC, DC 7.0 KHz 6.5 KHz 5.8 KHz 3.0 KHz 1.5 KHz 1.0 KHz 0.5 KHz
BOP 50-8MC, DC 11.0 KHz 9.0 KHz 7.0 KHz 3.0 KHz 1.5 KHz 1.0 KHz 0.5 KHz
BOP 72-6MC, DC 6.5 KHz 6.0 KHz 5.3 KHz 2.7 KHz 1.4 KHz 0.9 KHz 0.5 KHz
BOP 100-4MC, DC 5.0 KHz 4.5 KHz 3.5 KHz 2.1 KHz 1.25 KHz 1.0 KHz 0.5 KHz

                            NOTE: The listed bandwidth values are for C option units in voltage mode, nominal resistive load.

In Current Mode the dynamic specifications have a lower bandwidth and higher rise/fall time than the standard BOP models (see applicable Modification Sheet)


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