ZHCSI58C October 2009 – May 2018 TPS65720 , TPS65721
PRODUCTION DATA.
- 1 特性
- 2 應用
- 3 說明
- 4 修訂歷史記錄
- 5 Device Options
- 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 Battery Charger and Power Path
- 8.3.2 Power-Path Management
- 8.3.3 Battery Charging
- 8.3.4 Thermal Regulation and Thermal Shutdown
- 8.3.5 Battery Pack Temperature Monitoring
- 8.3.6 DCDC1 Converter
- 8.3.7 Power Save Mode
- 8.3.8 Short-Circuit Protection
- 8.3.9 Thermal Shutdown
- 8.3.10 LDO1
- 8.4 Device Functional Modes
- 8.5 Programming
- 8.6
Register Maps
- 8.6.1 CHGSTATUS Register Address: 01h (read only)
- 8.6.2 CHGCONFIG0 Register Address: 02h (read/write)
- 8.6.3 CHGCONFIG1 Register Address: 03h (read/write)
- 8.6.4 CHGCONFIG2 Register Address: 04h (read/write)
- 8.6.5 CHGCONFIG3 Register Address: 05h (read/write)
- 8.6.6 CHGSTATE Register Address: 06h (read only)
- 8.6.7 DEFDCDC1 Register Address: 07h (read/write)
- 8.6.8 LDO_CTRL Register Address: 08h (read/write)
- 8.6.9 CONTROL0 Register Address: 09h (read/write)
- 8.6.10 CONTROL1 Register Address: 0Ah (read/write)
- 8.6.11 GPIO_SSC Register Address: 0Bh (read/write)
- 8.6.12 GPIODIR Register Address: 0Ch (read/write)
- 8.6.13 IRMASK0 Register Address: 0Dh (read/write)
- 8.6.14 IRMASK1 Register Address: 0Eh (read/write)
- 8.6.15 IRMASK2 Register Address: 0Fh (read/write)
- 8.6.16 IR0 Register Address: 10h (read only)
- 8.6.17 IR1 Register Address: 11h (read)
- 8.6.18 IR2 Register Address: 12h (read)
- 9 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12器件和文檔支持
- 13機械、封裝和可訂購信息
9.2.2.2.1 Inductor Selection
The converter operates typically with 3.3-μH output inductor. Larger or smaller inductor values can be used to optimize the performance of the device for specific operation conditions. The selected inductor has to be rated for its DC resistance and saturation current. The DC resistance of the inductance will influence directly the efficiency of the converter. Therefore an inductor with lowest DC resistance should be selected for highest efficiency.
Equation 5 calculates the maximum inductor current under static load conditions. The saturation current of the inductor should be rated higher than the maximum inductor current as calculated with Equation 5. This is recommended because during heavy load transient the inductor current will rise above the calculated value.
where
- f = Switching Frequency (2.25 MHz typical)
- L = Inductor Value
- ΔIL = Peak-to-Peak inductor ripple current
- ILmax = Maximum Inductor current
The highest inductor current will occur at maximum Vin.
Open core inductors have a soft saturation characteristic and they can usually handle higher inductor currents versus a comparable shielded inductor.
A more conservative approach is to select the inductor current rating just for the maximum switch current of the corresponding converter. It must be considered, that the core material from inductor to inductor differs and will have an impact on the efficiency especially at high switching frequencies.
Refer to Table 5 and the typical applications for possible inductors.
Table 5. Tested Inductors
| INDUCTOR TYPE | INDUCTOR VALUE | SUPPLIER | COMMENTS |
|---|---|---|---|
| LQM21P | 3.3 µH | Murata | For TPS65720 |
| BRC1608T2R2M | 2.2 µH | Taiyo Yuden | For TPS65720; Smallest solution size; up to 150 mA of output current |
| VLS201610ET-2R2M | 2.2 µH | TDK | For TPS65720, TPS65721, TPS657201, TPS657202 |
| GLFR1608T2R2M-LR | 2.2 µH | TDK | For TPS65720; Smallest solution size; up to 150 mA of output current |
| MIPSA2520 | 2.2 µH | FDK | For TPS65721, TPS657201, TPS657202; highest efficiency |