- 您现在的位置：买卖IC网 > PDF目录225340 > TPS40001 (Texas Instruments, Inc.) Low Input Voltage Mode Synchronous Buck Controller PDF资料下载
参数资料
| 型号： | TPS40001 |
| 厂商： | Texas Instruments, Inc. |
| 英文描述： | Low Input Voltage Mode Synchronous Buck Controller |
| 中文描述： | 低输入电压模式同步降压控制器 |
| 文件页数： | 5/20页 |
| 文件大小： | 280K |
| 代理商： | TPS40001 |
TPS40000, TPS40001
TPS40002, TPS40003
TPS40004, TPS40005
SLUS507B JANUARY 2002 REVISED AUGUST 2003
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 |
|---|---|
| TPS40002 | "Low Input (2.25V-5.5V) 600 kHz Frequency |
| TPS40003EVM | TPS40003 Evaluation Module(TPS40003评估板) |
| TPS40003 | Low Input Voltage Mode Synchronous Buck Controller |
| TPS40004 | "Low Input (2.25V-5.5V) 300 kHz Frequency |
| TPS40005 | "Low Input (2.25V-5.5V) 600 kHz Frequency |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS40001DGQ | 功能描述:电压模式 PWM 控制器 Lo-Inp Voltage Mode Sync buck Controller 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 |
| TPS40001DGQG4 | 功能描述:电压模式 PWM 控制器 Lo-Inp Voltage Mode Sync buck Controller 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 |
| TPS40001DGQR | 功能描述:电压模式 PWM 控制器 Lo-Inp Voltage Mode Sync buck Controller 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 |
| TPS40001DGQRG4 | 功能描述:电压模式 PWM 控制器 Lo-Inp Voltage Mode Sync buck Controller 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 |
| TPS40001EVM-001 | 功能描述:EVALUATION MODULE FOR TPS40001 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:Predictive Gate Drive™ 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
发布紧急采购，3分钟左右您将得到回复。