SNVA940
November 2021
LM5157
,
LM5157-Q1
,
LM51571-Q1
,
LM5158
,
LM5158-Q1
,
LM51581
,
LM51581-Q1
Trademarks
1
LM5157 Boost Design Example
2
Calculations and Component Selection
2.1
Switching Frequency
2.2
Inductor Calculation
2.3
Slope Compensation Check
2.4
Inductor Selection
2.5
Diode Selection
2.6
Output Capacitor Selection
2.7
Input Capacitor Selection
2.8
UVLO Resistor Selection
2.9
Soft-Start Capacitor Selection
2.10
Feedback Resistor Selection
2.11
Control Loop Compensation
2.11.1
Crossover Frequency (fcross) Selection
2.11.2
RCOMP Selection
2.11.3
CCOMP Selection
2.11.4
CHF Selection
2.12
Power Loss and Efficiency Estimation
3
Implementation Results
4
Small Signal Frequency Analysis
4.1
Boost Regulator Modulator Modeling
4.2
Compensation Modeling
4.3
Open Loop Modeling