ZHCSBM9C SEPTEMBER 2013 – June 2018 TPS53513
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 5-V LDO and VREG Start-Up
- 7.3.2 Enable, Soft Start, and Mode Selection
- 7.3.3 Frequency Selection
- 7.3.4 D-CAP3 Control and Mode Selection
- 7.3.5 Power-Good
- 7.3.6 Current Sense and Overcurrent Protection
- 7.3.7 Overvoltage and Undervoltage Protection
- 7.3.8 Out-Of-Bounds Operation
- 7.3.9 UVLO Protection
- 7.3.10 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
7.3.3 Frequency Selection
TPS53513 device lets users select the switching frequency by using the RF pin. Table 1 lists the divider ratio and some example resistor values for the switching frequency selection. The 1% tolerance resistors with a typical temperature coefficient of ±100 ppm/ºC are recommended. If the design requires a tighter noise margin for more reliable SW-frequency detection, use higher performance resistors.
Table 1. Switching Frequency Selection
| SWITCHING FREQUENCY
(fSW) (kHz) |
RESISTOR
DIVIDER RATIO(1) (RDR) |
EXAMPLE RF FREQUENCY COMBINATIONS | |
|---|---|---|---|
| RRF_H (kΩ) | RRF_L (kΩ) | ||
| 1000 | > 0.557 | 1 | 300 |
| 850 | 0.461 | 180 | 154 |
| 750 | 0.375 | 200 | 120 |
| 600 | 0.297 | 249 | 105 |
| 500 | 0.229 | 240 | 71.5 |
| 400 | 0.16 | 249 | 47.5 |
| 300 | 0.096 | 255 | 27 |
| 250 | < 0.041 | 270 | 11.5 |
(1) Resistor divider ratio (RDR) is described in Equation 1.
space
Equation 1. 
where
- RRF_L is the low-side resistance of the RF pin resistor divider
- RRF_H is the high-side resistance of the RF pin resistor divider