SBAA598 September   2023 AMC1300 , AMC1300B-Q1 , AMC1301 , AMC1301-Q1 , AMC1302 , AMC1302-Q1 , AMC1311 , AMC1350 , AMC1351

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Bootstrap Power Supply Design
    1. 2.1 Selection of Charge Pump Capacitor
    2. 2.2 Simulation in TINA-TI
    3. 2.3 Hardware Test with AMC1311-Q1
  6. 3Summary
  7. 4Reference

Abstract

Isolated amplifiers provide isolation between their input signal and output signal, which is useful in many applications, such as phase current sensing in motor drives. Providing the high-side power to an isolated amplifier can be challenging. This application note introduces a bootstrap charge-pump circuit as a small, low-cost alternative for generating the high-side power supply and goes into detail regarding the design of such a circuit.