SLVAEV1 April   2022 TPS61041-Q1

 

  1. 1Introduction
  2. 2Proposed Circuit Principle
  3. 3Bench Test Result
  4. 4Summary

1 Introduction

Introduction

Designing a MOSFET driver supply for a 12-V car supply is quite challenging. The 12-V battery supply voltage is normally in the range of 9 V to 16 V under normal operating conditions depending on charge and load variation. The TPS61041-Q1 is a high-frequency, low-cost boost converter dedicated for a small to medium supply. The device allows the use of small external components, which gives a very small overall solution size. However, its input voltage range is from 1.8 V and 6 V. This application brief proposes an external circuit that can generate an output voltage following the input voltage adjustment and change.

For automotive applications that require a high-side MOSFET driver, the MOSFET gate needs a stable stepped-up voltage to ensure the MOSFET is fully turned on. The 12-V battery supply voltage is normally in the range of 9 V to 16 V under normal operating conditions depending on charge and load variation. Therefore, the driver voltage should follow the input voltage adjustment and change. Figure 1-1 shows the block diagram.

Figure 1-1 Block Diagram
Table 1-1 High-Side MOSFET Driver Circuit Specification
VDD/VVOUT/VIOUT/mA
9 V to 16 VVDD + 10 V5 V

The TPS61041-Q1 is a high-frequency boost converter dedicated for low-power applications. The device is ideal to generate output voltages up to 28 V from 1.8-V to 6-V input voltage range. The TPS61041-Q1 operates with a switching frequency up to 1 MHz.

This document introduces a circuit to generate the high-side MOSFET driver voltage using the TPS61041-Q1. Theoretical analysis and bench test results are presented to verify the proposed circuit. Table 1-1 shows the circuit specification.