ZHCSNP9B March 2021 – October 2021 TPS61379-Q1
PRODUCTION DATA
- 1 特性
- 2 应用
- 3 说明
- 4 Revision History
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
- 7 Specifications
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagrams
- 8.3
Feature Description
- 8.3.1 VCC Power Supply
- 8.3.2 Input Undervoltage Lockout (UVLO)
- 8.3.3 Enable and Soft Start
- 8.3.4 Shut Down
- 8.3.5 Switching Frequency Setting
- 8.3.6 Spread Spectrum Frequency Modulation
- 8.3.7 Bootstrap
- 8.3.8 Load Disconnect
- 8.3.9 MODE/SYNC Configuration
- 8.3.10 Overvoltage Protection (OVP)
- 8.3.11 Output Short Protection/Hiccup
- 8.3.12 Power-Good Indicator
- 8.3.13 Thermal Shutdown
- 8.4 Device Functional Modes
-
9 Application and Implementation
- 9.1 Application Information
- 9.2
Typical Application
- 9.2.1 Design Requirements
- 9.2.2 Detailed Design Procedure
- 9.2.3 Application Curves
- 10Power Supply Recommendations
- 11Layout
- 12Device and Documentation Support
- 13Mechanical, Packaging, and Orderable Information
8.3.5 Switching Frequency Setting
The TPS61379-Q1 uses a fixed frequency control scheme. The switching frequency can be programmed between 200 kHz and 2.2 MHz using a resistor from the FREQ pin to GND. The resistor must be connected when the oscillator is synchronized by an external clock. The resistance is defined by Equation 1.
Equation 1. 
where
- RFREQ is the resistance between the FREQ pin and the GND pin
For instance, the switching frequency is 2.2 MHz if the resistance between the FREQ pin and GND is 18 kΩ. This pin cannot be left floating or tied to VCC.