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參數(shù)資料
| 型號： | TPS9125PW |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 5 V/3 V SIM SUPPLY AND LEVEL SHIFTERS |
| 中文描述： | 5伏/ 3伏SIM卡供應(yīng)及電平轉(zhuǎn)換器 |
| 文件頁數(shù)： | 14/24頁 |
| 文件大小： | 338K |
| 代理商： | TPS9125PW |
TPS9125
5 V/3 V SIMSUPPLY AND LEVEL SHIFTERS
SLVS244A – SEPTEMBER 1999 – REVISED NOVEMBER 1999
14
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
Charge Pump
OSC
Control
Logic
VREF
1.192 V
1
T1
T2
Mode
VCAP2
VCAP1
MODE
SIMPWR
SIMVCC
C2
C1
GND
TPS9125
VDD
Figure 12. Functional Block Diagram of the Voltage Generator
When the TSP9125 is programmed in 5-V mode, the voltage at SIMVCC is monitored and regulated. If the
voltage of SIMVCC exceeds a defined upper threshold, the charge pump is switched off by disabling the
oscillator. In this state, all switching losses are zero, and the load is supplied only from the output capacitor C2.
The charge pump and oscillator are reactivated if the voltage at SIMVCC drops below a defined lower threshold.
In this state, the charge pump recharges output capacitor C2 until the voltage across C2 again exceeds the
defined upper threshold. Figure 12 shows the waveform of the charge pump output SIMVCC in 5-V mode.
Using this control mechanism, the switching losses of the charge pump and the losses of the oscillator are
minimized, because the charge pump and the oscillator are only activated when they are needed.
SIMVCC
Charge Pump
Enabled
Charge Pump
Disabled
Upper Threshold
Regulator
Hysteresis
max. 100 mV
Lower Threshold
Time
Figure 13. Typical Waveform at Charge Pump Output SIMV
CC
in 5-V Mode
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| TPS9125PWR | 制造商:Rochester Electronics LLC 功能描述:SIM-CARD INTERFACE - Bulk 制造商:Texas Instruments 功能描述: |
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| TPS92001 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:GENERAL PURPOSE LED LIGHTING PWM CONTROLLER |
| TPS92001D | 功能描述:LED照明驅(qū)動(dòng)器 Gen Pur LED Lighting PWM Controller RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
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