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High Isolation DC/DC Converters for Gate Drivers
From RECOM

High Isolation DC/DC Converters for Gate Drivers

DC/DC converters are often required to provide an isolated asymmetric supply for high-side gate drivers. The simplest (functional) isolation can withstand 1kVDC for one second. This sounds impressive; however this is often not sufficient.

High side inverters are often floated a few hundred volts with an opto-isolated PWM control, so the gate drivers need an isolated power supply. This isolated supply is typically +15/-9V for IGBT, +20/-5V or +15/-3V for SiC or +6V and +9V for GaN. A typical DC/DC isolation voltage would be at least twice the working voltage, but the high ambient temperature and fast switching edges generated by these high-power transistors additionally stress the insulation barrier. RECOM combines the required asymmetric output voltages, high insulation voltage and low isolation capacitance into one simple DC/DC converter module. Whether IGBT, SiC MOSFET or GaN HEMT, RECOM has the matching drop-in product.

High isolation 2W DC/DC converters for SiC gate drivers

Recom’s 2W (RKZ and RxxP2xx series) SiC gate driver DC/DC converters provide isolation up to 6.4kVDC/1 sec. They were specifically designed to power gate drivers for SiC MOSFETs requiring +20/-5V or +15/-3V drive levels.

Part Number
Nominal Input Voltage (V)
Output Voltage (V)
Output Power (W)
Isolation (kV)
R05P22005D/P
5
20/-5
2
6.4
R12P21503D
12
15/-3
2
6.4
R12P22005D
12
20/-5
2
6.4
R12P22005D/P
12
20/-5
2
6.4
R15P21503D
15
15/-3
2
6.4
R15P22005D
15
20/-5
2
6.4
R15P22005D/P
15
20/-5
2
6.4
R24P21503D
24
15/-3
2
6.4
R24P21503D/P
24
15/-3
2
6.4
R24P22005D
24
20/-5
2
6.4
R24P22005D/P
24
20/-5
2
6.4
RKZ-052005D
5
20/-5
2
3
RKZ-052005D/H
5
20/-5
2
4
RKZ-052005D/HP
5
20/-5
2
4
RKZ-052005D/P
5
20/-5
2
3
RKZ-122005D
12
20/-5
2
3
RKZ-122005D/H
12
20/-5
2
4
RKZ-122005D/HP
12
20/-5
2
4
RKZ-122005D/P
12
20/-5
2
3
RKZ-152005D
15
20/-5
2
3
RKZ-152005D/H
15
20/-5
2
4
RKZ-152005D/HP
15
20/-5
2
4
RKZ-152005D/P
15
20/-5
2
3
RKZ-242005D
24
20/-5
2
3
RKZ-242005D/H
24
20/-5
2
4
RKZ-242005D/HP
24
20/-5
2
4
RKZ-242005D/P
24
20/-5
2
3

DC/DC supplies for GaN technology

GaN devices are set to supersede existing SiC MOSFETs for many applications and reach their optimal performance with a gate switching voltage of +6V from RP-xx06S and RxxP06S DC/DC converter series. In GaN applications where higher noise and interferences have to be considered, RECOM also offers converters with +9V output which can be split up via a Zener diode to +6V and -3V to provide a negative gate voltage on turn-off ensuring that the gate voltage stays below the turn-on threshold.

Part Number
Nominal Input Voltage (V)
Output Voltage (V)
Output Power (W)
Isolation (kV)
R05P06S
5
6
1
6.4
R12P06S
12
6
1
6.4
R15P06S
15
6
1
6.4
R24P06S
24
6
1
6.4
RP-0506S
5
6
1
5.2
RP-1206S
12
6
1
5.2
RP-1506S
15
6
1
5.2

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