SLVAFK5A December 2023 – February 2024 LM5177 , LM51770
4.3.1 Dual Phase Operation at Variable Load
To verify the thermal stability of the EVM with parallel operation and load sharing, thermal images (Figure 4-11 to Figure 4-18) are taken of EVM for normal and extreme load conditions under different LM5177 converter topologies. The maximum operating temperature of LM5177 is 120 degrees Celsius. The results show that the maximum load current capability in boost mode is limit to 12 A because of the peak current limiter, and have a high temperature under extreme load (12 A) conditions compared to the buck and buck-boost modes.
Figure 4-11 Thermal Condition in Boost
Region (VIN=8 V and 8 A Load)
Figure 4-13 Thermal Condition in Boost
Region (VIN=10 V and 8 A Load)
Figure 4-15 Thermal Condition in
Buck-Boost Region (VIN=16 V and 8 A Load)
Figure 4-17 Thermal Condition in Buck
Region (VIN=24 V and 8 A Load)
Figure 4-12 Thermal Condition in Boost
Region (VIN=8 V and 12 A Load)
Figure 4-14 Thermal Condition in Boost
Region (VIN=10 V and 14 A Load)
Figure 4-16 Thermal Condition in
Buck-Boost Region (VIN=16 V and 18 A Load)
Figure 4-18 Thermal Condition in Buck
Region (VIN=24 V and 18 A Load)