ZHCS625B DECEMBER 2011 – February 2019 TPS53219A
PRODUCTION DATA.
- 1 特性
- 2 应用
- 3 说明
- 4 修订历史记录
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 Enable and Soft-Start
- 7.3.2 Adaptive ON-Time D-CAP Control and Frequency Selection
- 7.3.3 Small Signal Model
- 7.3.4 Ramp Signal
- 7.3.5 Adaptive Zero Crossing
- 7.3.6 Output Discharge Control
- 7.3.7 Low-Side Driver
- 7.3.8 High-Side Driver
- 7.3.9 Power Good
- 7.3.10 Current Sense and Overcurrent Protection
- 7.3.11 Overvoltage and Undervoltage Protection
- 7.3.12 UVLO Protection
- 7.3.13 Thermal Shutdown
- 7.4 Device Functional Modes
- 8 Application and Implementation
- 9 Power Supply Recommendations
- 10Layout
- 11器件和文档支持
- 12机械、封装和可订购信息
7.3.8 High-Side Driver
The high-side driver is designed to drive high current, low RDS(on) N-channel MOSFETs. When configured as a floating driver, the bias voltage is delivered from the VDRV pin supply. The average drive current is calculated using Equation 4.
Equation 4. 
The instantaneous drive current is supplied by the flying capacitor between VBST and SW pins. The drive capability is represented by internal resistance, which is 1.5 Ω for VBST to DRVH and 0.7 Ω for DRVH to SW.
The driving power which needs to be dissipated from TPS53219A package.
Equation 5. 