ZHCSCV2C june 2014 – may 2023 TPS65263
PRODUCTION DATA
- 1
- 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 Diagram
- 8.3
Feature Description
- 8.3.1 Adjusting the Output Voltage
- 8.3.2 Enable and Adjusting UVLO
- 8.3.3 Soft-Start Time
- 8.3.4 Power-Up Sequencing
- 8.3.5 V7V Low Dropout Regulator and Bootstrap
- 8.3.6 Out-of-Phase Operation
- 8.3.7 Output Overvoltage Protection (OVP)
- 8.3.8 Pulse Skipping Mode (PSM)
- 8.3.9 Slope Compensation
- 8.3.10 Overcurrent Protection
- 8.3.11 Power Good
- 8.3.12 Thermal Shutdown
- 8.4 Device Functional Modes
- 8.5
Register Maps
- 8.5.1 Register Description
- 8.5.2 VOUT1_SEL: Vout1 Voltage Selection Register (offset = 0x00H)
- 8.5.3 VOUT2_SEL: Vout2 Voltage Selection Register (offset = 0x01H)
- 8.5.4 VOUT3_SEL: Vout3 Voltage Selection Register (offset = 0x02H)
- 8.5.5 VOUT1_COM: Buck1 Command Register (offset = 0x03H)
- 8.5.6 VOUT2_COM: Buck2 Command Register (offset = 0x04H)
- 8.5.7 VOUT3_COM: Buck3 Command Register (offset = 0x05H)
- 8.5.8 SYS_STATUS: System Status Register (offset = 0x06H)
- 9 Application and Implementation
- 10Device and Documentation Support
- 11Mechanical, Packaging, and Orderable Information
9.2.2.1 Output Inductor Selection
To calculate the value of the output inductor, use Equation 7. LIR is a coefficient that represents the amount of inductor ripple current relative to the maximum output current. The inductor ripple current is filtered by the output capacitor. Therefore, choosing high inductor ripple currents impact the selection of the output capacitor because the output capacitor must have a ripple current rating equal to or greater than the inductor ripple current. In general, the inductor ripple value is at the discretion of the designer; however, LIR is normally from 0.1 to 0.3 for the majority of applications.
For the output filter inductor, it is important that the RMS current and saturation current ratings not be exceeded. The RMS and peak inductor current can be found from Equation 9 and Equation 10.
The current flowing through the inductor is the inductor ripple current plus the output current. During power up, faults or transient load conditions, the inductor current can increase above the calculated peak inductor current level calculated above. In transient conditions, the inductor current can increase up to the switch current limit of the device. For this reason, the most conservative approach is to specify an inductor with a saturation current rating equal to or greater than the switch current limit rather than the peak inductor current.