PD200X4 V2 Manual
7
Modified 13/01/2021
7
Bridged Mode
In bridged mode, two channels are connected in series to double the output voltage range and
power. For example, the PD200X4-V100,100 has four independent channels with a range of +/-100 V.
When the Bridge Mode switch is enabled, channel 2 is inverting, which results in +/-200 V across the
load. Therefore, the effective voltage gain is doubled to 40.
In bridged mode, the load is connected between the outputs of two channels and is not connected to
ground. Grounded loads cannot be driven using bridged mode. Care should be taken not to connect
the negative side (channel 2 and 4) to ground accidentally, for example, by using a grounded
oscilloscope probe.
Figure 2. Bridged load configuration to /-200 V using two +/-100 V channels. Note that the
inputs to channel 2 (and 4) are not used. The offset and voltage limit is not shown for simplicity.
In bridged mode, the overload conditions for both channels are linked. For example, if channels 1 and
2 are operated in bridged mode, an overload condition in either channel will trigger a shutdown in
both channels.
The current limits in bridge mode are identical to the single channel limits. The power bandwidth
calculator in Section 10 can also be used for predicting bridge-mode performance; however, the load
capacitance used in the calculator must be doubled, and all of the voltages refer to a single channel.
For example, consider a PD200X4-V100,100 used to drive a 1uF load with +/-200V in bridged mode.
The correct calculator inputs are shown in Figure 3.
20
20
-1
Channel 1
Input
Bridge Mode
Switch
±
5V
±
100V
±
100V
±
200V
Voltage across load
Output A
