ZHCSCG9C May 2014 – July 2019 TPS62150A-Q1 , TPS62152A-Q1 , TPS62153A-Q1
PRODUCTION DATA.
- 1 特性
- 2 应用
- 3 说明
- 4 修订历史记录
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
- 7 Specifications
- 8 Parameter Measurement Information
-
9 Detailed Description
- 9.1 Overview
- 9.2 Functional Block Diagram
- 9.3
Feature Description
- 9.3.1 Pulse Width Modulation (PWM) Operation
- 9.3.2 Power Save Mode Operation
- 9.3.3 100% Duty-Cycle Operation
- 9.3.4 Enable / Shutdown (EN)
- 9.3.5 Soft Start / Tracking (SS/TR)
- 9.3.6 Current Limit And Short Circuit Protection
- 9.3.7 Power Good (PG)
- 9.3.8 Pin-Selectable Output Voltage (DEF)
- 9.3.9 Frequency Selection (FSW)
- 9.3.10 Under Voltage Lockout (UVLO)
- 9.3.11 Thermal Shutdown
- 9.4 Device Functional Modes
-
10Application and Implementation
- 10.1 Application Information
- 10.2
Typical Application
- 10.2.1
TPS62150A-Q1 Point-Of-Load Step Down Converter
- 10.2.1.1 Design Requirements
- 10.2.1.2
Detailed Design Procedure
- 10.2.1.2.1 Custom Design With WEBENCH® Tools
- 10.2.1.2.2 Programming The Output Voltage
- 10.2.1.2.3 External Component Selection
- 10.2.1.2.4 Inductor Selection
- 10.2.1.2.5 Output Capacitor
- 10.2.1.2.6 Input Capacitor
- 10.2.1.2.7 Soft Start Capacitor
- 10.2.1.2.8 Tracking Function
- 10.2.1.2.9 Output Filter And Loop Stability
- 10.2.1.3 Application Curves
- 10.2.2 System Examples
- 10.2.1
TPS62150A-Q1 Point-Of-Load Step Down Converter
- 11Power Supply Recommendations
- 12Layout
- 13器件和文档支持
- 14机械、封装和可订购信息
9.3.6 Current Limit And Short Circuit Protection
The TPS6215xA-Q1 is protected against heavy load and short circuit events. At heavy loads, the current limit determines the maximum output current. If the current limit is reached, the high-side FET turns off. Avoiding shoot through current, the low-side FET switches on to allow the inductor current to decrease. The high-side FET turns on again, only if the current in the low-side FET has decreased below the low-side current limit threshold.
The output current of the device is limited by the current limit (see Electrical Characteristics). Due to internal propagation delay, the actual current can exceed the static current limit during that time. The dynamic current limit can be calculated as follows:
spacing
where
ILIMF is the static current limit, specified in the ,
L is the inductor value,
VL is the voltage across the inductor (VIN - VOUT) and
tPD is the internal propagation delay.
The current limit can exceed static values, especially if the input voltage is high and very small inductances are used. The dynamic high side switch peak current can be calculated as follows:
spacing
