- 您现在的位置：买卖IC网 > PDF目录69508 > TPS40003DGQG4 (TEXAS INSTRUMENTS INC) SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO10 PDF资料下载
参数资料
| 型号： | TPS40003DGQG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | PLASTIC, MSOP-10 |
| 文件页数： | 5/27页 |
| 文件大小： | 663K |
| 代理商： | TPS40003DGQG4 |
第1页第2页第3页第4页当前第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页
TPS40000, TPS40001
TPS40002, TPS40003
TPS40004, TPS40005
SLUS507D JANUARY 2002 REVISED NOVEMBER 2005
13
www.ti.com
APPLICATION INFORMATION
setting the current limit
Connecting a resistor from VDD to ILIM sets the current limit. A 15-
A current sink internal to the device causes
a voltage drop at ILIM that is equal to the overcurrent threshold voltage. Ensure that (VDD0.8 V) ≤ VILIM ≤ VDD.
The tolerance of the current sink is too loose to do an accurate current limit. The main purpose is for hard fault
protection of the power switches. Given the tolerance of the ILIM sink current, and the RDS(on) range for a
MOSFET, it is generally possible to apply a load that thermally damages the converter. This device is intended
for embedded converters where load characteristics are defined and can be controlled.
soft-start and shutdown
These two functions are common to the SS/SD pin. The voltage at this pin is the controlling voltage of the error
amplifier during startup. This reduces the transient current required to charge the output capacitor at startup,
and allows for a smooth startup with no overshoot of the output voltage if done properly. A shutdown feature
can be implemented as shown in Figure 5.
CSS
UDG01143
SS/SD
4
TPS40000
SHUTDOWN
3
A
Figure 5. Shutdown Implementation
The device shuts down when the voltage at the SS/SD pin falls below 120 mV. Because of this limitation, it is
recommended that a MOSFET be used as the controlling device, as in Figure 5. An open-drain CMOS logic
output would work equally well.
rectifier zero-current
Both the TPS40000 and TPS40002 parts are source-only, thus preventing reverse current in the synchronous
rectifier. Synchronous rectification is terminated by sensing the voltage, SW with respect to ground, across the
low-side MOSFET. When SW node is greater than 7 mV, rectification is terminated and stays off until the next
PWM cycle. In order to filter out undesired noise on the SW node, the zero-current comparator is blanked for
75 ns from the time the rectifier is turned on.
The TPS40001 and TPS40003 parts enable the zero-current comparator, (and therefore prevent reverse
current), while soft-start is active. However, when the output reaches regulation; that is, at the end of the
soft-start time, this comparator is disabled to allow the synchronous rectifier to sink current.
相关PDF资料 |
PDF描述 |
|---|---|
| TPS40020PWP | 0.01 A SWITCHING CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, PDSO16 |
| TPS40020PWPG4 | 0.01 A SWITCHING CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, PDSO16 |
| TPS40021PWPR | 0.01 A SWITCHING CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, PDSO16 |
| TPS40020PWPR | 0.01 A SWITCHING CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, PDSO16 |
| TPS40021PWP | 0.01 A SWITCHING CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, PDSO16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS40003DGQR | 功能描述:电压模式 PWM 控制器 Lo Input Vltg Mode Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| TPS40003DGQRG4 | 功能描述:电压模式 PWM 控制器 Lo Input Vltg Mode Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| TPS40004 | 制造商:TI 制造商全称:Texas Instruments 功能描述:LOW-INPUT VOLTAGE-MODE SYNCHRONOUS BUCK CONTROLLER |
| TPS40004DGQ | 功能描述:电压模式 PWM 控制器 Lo Input 300kHz Freq Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| TPS40004DGQG4 | 功能描述:电压模式 PWM 控制器 Lo Input 300kHz Freq Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。