基于TPS54260設計的GSM電源解決方案

TI 公司的TPS54260是集成了200毫歐姆高邊MOSFET的60V/2.5A降壓穩壓器, 電流模式控制簡化了外部補償和提供了方便選擇元件.輸入電壓從3.5V到60V,工作靜態電流138uA,關斷電流1.3uA,開關頻率100kHz到2.5MHz.主要應用在12V,24V和48V工業與通信低壓電源,GSM和GPRS模塊電源.本文介紹了TPS54260主要特性, 功能方框圖, 輸出3.3V和4.2V設計案例, 反向和分裂電源電路圖,以及采用TPS54260開發的GSM/GPRS電源電路和材料清單, TPS54260EVM-597評估模塊的性能指標,電路圖和材料清單(BOM).

The TPS54260 device is a 60V, 2.5A, step down regulator with an integrated high side MOSFET. Current mode control provides simple external compensation and flexible component selection. A low ripple pulse skip mode reduces the no load, regulated output supply current to 138mA. Using the enable pin, shutdown supply current is reduced to 1.3mA, when the enable pin is low.

Under voltage lockout is internally set at 2.5V, but can be increased using the enable pin. The output voltage startup ramp is controlled by the slow start pin that can also be configured for sequencing/tracking. An open drain power good signal indicates the output is within 94% to 107% of its nominal voltage.

A wide switching frequency range allows efficiency and external component size to be optimized. Frequency fold back and thermal shutdown protects the part during an overload condition. The TPS54260 is available in 10 pin thermally enhanced MSOP Power Pad? package.

TPS54260主要特性:

3.5V to 60V Input Voltage Range

200-m High-Side MOSFET

High Efficiency at Light Loads with a Pulse Skipping Eco-Mode?

138μA Operating Quiescent Current

1.3μA Shutdown Current

100kHz to 2.5MHz Switching Frequency

Synchronizes to External Clock

Adjustable Slow Start/Sequencing

UV and OV Power Good Output

Adjustable UVLO Voltage and Hysteresis

0.8-V Internal Voltage Reference

MSOP10 Package With PowerPAD?

Supported by SwitcherPro? Software Tool

TPS54260應用:

12-V, 24-V and 48-V Industrial and Commercial Low Power Systems

GSM, GPRS Modules in Fleet Management, E-Meters, and Security Systems


圖1.TPS54260功能方框圖

圖2.TPS54260輸出3.3V設計案例

圖2.TPS54260反向電源電路圖

圖3.TPS54260分裂電源電路圖

圖4.采用TPS54260的12V到3.8V的GSM電源電路圖

圖5.采用TPS54260的24V到4.2V的GSM電源電路圖

采用TPS54260開發GSM/GPRS電源

The input voltage supply for the GSM/GPRS module can be from 3.2 V to 4.5 V, with an average power supply current requirement of 400 mA to ~1 A. The power supply must also be able to sustain transmission pulses of 2 A to 3 A, thus considerations for excellent load regulation and low-ripple needs to be taken into account, simultaneously ensuring a highly efficient design.

The average current consumption depends upon the class supported by the module. The most common GPRS classes are Class 8, Class 10 and Class 12. Higher the GPRS class, the faster the data transfer rates and correspondingly it requires more number of timeslots for transmission. Class 8 uses 4 Rx and 1 Tx slot, Class 10 uses 3 Rx and 2 Tx slots and Class 12 uses 1 Rx and 4 Tx slots.

Thus, a GSM/GPRS Module transmits either 1/2/3 time slot(s) of 577us during a 4.6ms period, and receives or remains idle for the rest 4.0ms/3.4ms/2.3ms time depending upon whether it is GSM/GPRS Class 8, Class 10 or Class 12 module. Taking 3 A as the amplitude of transmission bursts, this leads to an average current consumption of about 400mA incase of Class 8 to ~ 1 A in case of Class 12. A power supply design for a GSM/GPRS module should be able to deliver this average current, and also handle intermittent transmission bursts with high current consumption.

GSM/GPRS電源系統參數:


圖6. 3.8V輸出TPS54260設計案例-1

設計案例-1材料清單(BOM):


圖7. 4.2輸出TPS54260設計案例-2

設計案例-2材料清單(BOM):

TPS54260EVM-597 2.5-A, SWIFT? 穩壓器評估模塊

TPS54260EVM-597性能指標:


圖8.TPS54260EVM-597電路圖

TPS54260EVM-597材料清單(BOM):