SLOA198A
September 2014 – December 2021
DRV2665
,
DRV2667
,
DRV2700
,
DRV8662
Trademarks
1
Boost Converter Basics
2
DRV8662, DRV2700, DRV2665, and DRV2667 Boost Converter
2.1
DRV8662, DRV2700, DRV2665, and DRV2667 Boost Converter Efficiency
2.1.1
Boost Efficiency vs Boost Current
2.2
DRV8662, DRV2700, DRV2665, and DRV2667 Boost Converter Load Regulation
2.2.1
Boost Regulation vs Current
3
Configuring the Boost Converter
4
Boost Converter Output Voltage
5
Calculating the Load Current
6
Selecting an Inductor
6.1
Inductance Rating
6.2
Saturation Current Rating
6.3
Thermal Current Rating
6.4
Choosing REXT
6.5
What to Avoid: Using Incorrect Inductor Current Ratings
7
Calculate the Maximum Boost Current
8
Output Capacitor Selection
9
Input Capacitor Selection
10
PCB Layout
10.1
What to Avoid: Incorrect Inductor Placement
11
Examples
11.1
Example: Based on the DRV8662EVM
11.1.1
Configure the Boost Voltage
11.1.2
Configure the Inductor Current
11.1.3
Boost Performance Results
11.2
Example: Based on the DRV2667EVM-CT with 25-nF Piezo Module
11.2.1
Configure the Boost Voltage
11.2.2
Configure the Inductor Current
11.2.3
Boost Performance Results
12
Revision History
2.1.1
Boost Efficiency vs Boost Current
Figure 2-1
Efficiency with V
BST
= 30 V
Figure 2-3
Efficiency with V
BST
= 80 V
Figure 2-2
Efficiency with V
BST
= 55 V
Figure 2-4
Efficiency with V
BST
= 105 V