TIDUF99 November 2024
- 1
- Description
- Resources
- Features
- Applications
- 6
- 1System Description
- 2System Overview
- 3System Design Theory
- 4Hardware, Software, Testing Requirements, and Test Results
- 5Design and Documentation Support
- 6About the Author
4.4.1 Short Mode Test Result
In short mode, the DC source is directly connected to the load through the on-resistance of power switch and passive components on the board. The buck stage duty cycle is 100%, the boost stage duty cycle is 0%. Figure 4-3 shows the block diagram of this mode.
Figure 4-3 Short Mode Block
DiagramTable 4-6, Table 4-2, and Figure 4-4 show the efficiency for different input voltage and power rating. A value of 33V is chosen because most of the MPPT voltage of the 400W panels is at about this range. A value of 43V is chosen because this is a representative voltage for the MPPT voltage of 500W and 600W of the panels.
- Peak efficiency for 33Vin is 99.5% from 120W to 240W and full load efficiency at 400W is 99.3%
- Peak efficiency for 43Vin is 99.6% at 250W, full load efficiency at 600W is 99.3%
Table 4-1 TIDA-010949 Short Mode
Efficiency, 33Vin
| OUTPUT POWER | 20W | 40W | 80W | 120W | 180w | 240w | 300w | 400w |
|---|---|---|---|---|---|---|---|---|
| Vin=33V | 97.8% | 98.9% | 99.3% | 99.5% | 99.5% | 99.5% | 99.4% | 99.3% |
Table 4-2 TIDA-010949 Short Mode
Efficiency, 43VIN
| OUTPUT POWER | 25W | 50W | 100W | 150W | 200W | 250W | 320W | 450W | 500W | 600W |
|---|---|---|---|---|---|---|---|---|---|---|
| Vin=43V | 97.6% | 98.8% | 99.3% | 99.5% | 99.5% | 99.6% | 99.5% | 99.5% | 99.5% | 99.3% |
Figure 4-4 Short Mode Efficiency