SNVAA21
August 2021
LM61480-Q1
,
LM61495-Q1
,
LM62460
,
LM62460-Q1
Trademarks
1
Introduction
2
Different Types of Current Sensing
3
Basic Current Sharing Operation
4
Schematic and BOM
5
Lab Measurements
6
Caveats and Recommendations
7
Summary
8
References
5
Lab Measurements
Figure 5-1
Inductor Current Sharing Steady-State Waveform
I
OUT_(Main)
= 4.53 A
I
OUT_(Secondary)
= 4.64 A
I
OUT_(Average)
= 4.58 A
Current sharing accuracy = 4.58 +/- 1.13%
Figure 5-2
Inductor Current Sharing Load Transient (3 A to 9 A) Waveform
I
OUT_(Main)
= 4.79A
I
OUT_(Secondary)
= 4.47A
I
OUT_(Average)
= 4.63A
Current sharing accuracy = 4.63 +/- 3.45%
Figure 5-3
Efficiency at 400 kHz (VIN = 16 V; VOUT = 3.3 V)
Figure 5-4
Thermal Measurement at 400 kHz (VIN = 16 V; VOUT = 3.3 V; IOUT = 4.5 A)
Figure 5-5
Efficiency at 2.2 MHz ( VIN = 16 V; VOUT = 3.3 V)
Figure 5-6
Thermal Measurement at 2.2 MHz (VIN = 16 V; VOUT = 3.3 V: IOUT = 4.5 A)