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TPPM0115 PDF预览

TPPM0115

更新时间: 2024-11-22 22:19:15
品牌 Logo 应用领域
德州仪器 - TI 开关控制器
页数 文件大小 规格书
13页 238K
描述
SWITCH MODE SYNCHRONOUS BUCK CONTROLLER

TPPM0115 数据手册

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TPPM0115  
SWITCH MODE SYNCHRONOUS BUCK CONTROLLER  
SLVS371A– MARCH 2001 – REVISED JUNE 2001  
SO (D) PACKAGE  
(TOP VIEW)  
features  
D
DC-DC Synchronous Buck Controller  
Switching Frequency, 200 kHz (Typ)  
V
GND  
SEN  
1
2
3
4
8
7
6
5
CC  
D
PWRGD  
NC  
D
D
D
D
Programmable Output Voltage,  
1 V to 2.5 V ±2%  
DRVL  
DRVH  
PHASE  
Power Good Function (PWRGD)  
NC – No internal connection  
Input Voltage, 12 V ±5%  
Drive High Load Current With External  
Components  
applications  
D
PC Motherboard, Voltage Regulation for  
System Power  
D
D
D
DDR Memory Supply (V  
or V  
)
)
TT  
DDQ  
RDRAM Memory Supply (V  
DDQ  
General Purpose Synchronous Switch  
Mode Controller  
description  
The TPPM0115 is a synchronous buck controller capable of driving two external power FETs 180° out of phase.  
The device requires a minimum of external standard filter components and switching FETs to regulate the  
desired output voltage. This is achieved with an internal switching frequency of 200 kHz (typical).  
The TPPM0115 switch mode controller and associated circuitry provide efficient voltage regulation of greater  
than 85%. The output voltage is set by two external resistors. During power up, when the output voltage reaches  
90% of the desired value, the power good (PWRGD) output is transitioned high after a short delay of 1 ms to  
5 ms. During power down, when the output voltage falls below 90% of the set value, the PWRGD output is pulled  
low without any delay.  
In the event the set output is in an over-voltage condition due to a system fault, the drive to the lower FET turns  
on to correct the fault. There is a dead time between switching one FET ON while the other FET is switching  
OFF to prevent cross conduction.  
The TPPM0115 is capable of driving high static load currents with minimal ripple on the output (<2%). Thephase  
sense input is used to sense the flow of current through the inductor during flyback to minimize ripple on the  
output.  
To optimize output filter capacitance, the voltage mode control is based on a fixed ON time during the start of  
the cycle and hysteretic control during load transients. This allows the device to respond and maintain the set  
regulation voltage.  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
Copyright 2001, Texas Instruments Incorporated  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of Texas Instruments  
standard warranty. Production processing does not necessarily include  
testing of all parameters.  
1
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  

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