Figure 5-56 shows CLLLC operation at 19 A (6.6 kW) under the following parameters:
- Traces
- C1: GaN Primary Switch Node Drain Voltage
- C2: GaN Secondary Switch Node Drain Voltage
- C3: Transformer Primary Current
- C4: Transformer Secondary Current
- Conditions
- VIN = 400 V
- VOUT = 350 V
- IOUT = 19 A
Figure 5-57 shows CLLLC
operation at 10 A and the following parameters:
- Traces
- C1: GaN Switch Node Drain Voltage Leg 1
- C2: GaN Switch Node Drain Voltage Leg 2
- C3: Transformer Primary Current
- C4: Transformer Secondary Current
- Conditions
- VIN = 400 V
- VOUT = 350 V
- IOUT = 10 A
A zoom-in of the GaN
switch drain-to-source voltage transition is shown to be approximately 40 ns in
Figure 5-58. This
rapid transition comes from the low COSS of the LMG3522.
The waveform in Figure 5-58 is measured
using the following parameters:
- Traces
- C1: GaN Switch Node Drain Voltage Leg 1
- C2: GaN Switch Node Drain Voltage Leg 2
- C3: Transformer Primary Current
- C4: Transformer Secondary Current
- Conditions
- VIN = 400 V
- VOUT = 350 V
- IOUT = 10 A
The waveform in Figure 5-59 is measured using the following parameters:
- Traces
- C1: GaN Switch Node Drain Voltage Leg 1
- C2: GaN Switch Node Drain Voltage Leg 2
- C3: Transformer Primary Current
- C4: Transformer Secondary Current
- Conditions
- VIN = 400 V
- VOUT = 350 V
- IOUT = 2 A
A zoom-in of the GaN
switch drain-to-source voltage transition is shown to be approximately 75 ns in
Figure 5-60. This rapid transition comes from the low COSS of the LMG3522. The
slightly longer transition time in this image comes from the lighter load condition
and the resulting reduced current flow.
The waveform in Figure 5-60 is measured using the following parameters:
- Traces
- C1: GaN Switch Node Drain Voltage Leg 1
- C2: GaN Switch Node Drain Voltage Leg 2
- C3: Transformer Primary Current
- C4: Transformer Secondary Current
- Conditions
- VIN = 400 V
- VOUT = 350 V
- IOUT = 2 A