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| 型号： | TPS40195RGYR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 580 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封装： | GREEN, PLASTIC, QFN-16 |
| 文件页数： | 5/43页 |
| 文件大小： | 1086K |
| 代理商： | TPS40195RGYR |
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T-Time-500 ms/div
HDRV
(2V/div)
PGOOD
(2V/div)
VOUT
(1V/div)
EN
(1V/div)
Voltage Reference
Oscillator and Synchronization
(
)
f
4
SW
RT
2.5
10
R
=
(1)
www.ti.com ........................................................................................................................................ SLUS720D – FEBRUARY 2007 – REVISED NOVEMBER 2008
Figure 17. TPS40195 EN Pin Startup
The band gap cell is designed with a trimmed 0.591-V output. The 0.5% tolerance on the reference voltage
allows the user to design a very accurate power supply.
The TPS40195 has a programmable switching frequency of 100 kHz to 600 kHz using a resistor connected from
the RT pin to GND. The relationship between switching frequency and the resistor from RT to GND is given in
where
f
SW is the switching frequency in kHz
R
RT is the resistor connected from RT to GND in k
When the oscillator is programmed using this method, the SYNC pin is configured as an input. The device may
be synchronized to a higher frequency than the free running frequency by applying a pulse train to the SYNC pin.
For best results, limit the frequency of the pulse train applied to SYNC to 20% more than the free running
frequency. The TPS40195 will synchronize to the falling edge of the pulse train applied to the SYNC pin.
Copyright 2007–2008, Texas Instruments Incorporated
13
Product Folder Link(s): TPS40195
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| TPS40197RGYR | 功能描述:DC/DC 开关控制器 4.5-14V Inp Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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