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| 型号： | TPS40021PWP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.01 A SWITCHING CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, HTSSOP-16 |
| 文件页数： | 5/36页 |
| 文件大小： | 724K |
| 代理商： | TPS40021PWP |
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TPS40020
TPS40021
SLUS535D MARCH 2003 REVISED JULY 2007
www.ti.com
13
APPLICATION INFORMATION
Setting the Short Circuit Current Limit Threshold
Connecting a resistor from VDD to ILIM sets the current limit. A current sink in the chip causes a voltage drop
across the resistor connected to ILIM. This voltage drop is the short circuit current threshold for the part. The
current that the ILIM pin sinks is dependent on the value of the resistor connected to RT and is given by:
I
ILIM + 19.0
0.69 V
R
T
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. A small capacitor can
be added between ILIM and VDD for filtering. However, capacitors should not be used if the synchronization
function is to be used.
Soft-Start and Shutdown
The softstart and shutdown functions are common to the SS/SD pin. The voltage at this pin overrides the
reference voltage on the error amplifier during startup. This controls the output voltage slew rate and the surge
current required to charge the output capacitor at startup, allowing for a smooth startup with no overshoot of
the output voltage. Initial HDRV pulse widths during SoftStart are typically very narrow, likely less than 150ns.
As a result, HDRV and LDRV can be on simultaneously, resulting in crossconduction the MOSFETs of the
power stage. To minimize crossconduction during softstart, the softstart time when the pulse widths are
less than 150ns should be kept to a minimum. A shutdown feature can be implemented by pulling SS/SD to
GND via a transistor as shown in Figure 5.
CSS SS/SD
6
TPS4002x
SHUTDOWN
3.3
A
Figure 5. Shutdown Implementation
C
SS +
I
SS
V
FB
t
SS (F)
where
D tSS is the start up time in seconds
Switching Frequency
The switching frequency is programmed by a resistor from RT to SGND. Nominal switching frequency can be
calculated by:
R
T (kW) +
37.736
103
f
OSC
(kHz)
* 5.09 (kW)
(1)
(2)
(3)
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| TPS40020PWPRG4 | 0.01 A SWITCHING CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, PDSO16 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS40021PWPG4 | 功能描述:DC/DC 开关控制器 Low Input Sync Buck Cntrlr source/sink 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 |
| TPS40021PWPR | 功能描述:DC/DC 开关控制器 Low Input Sync Buck Cntrlr source/sink 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 |
| TPS40021PWPRG4 | 功能描述:DC/DC 开关控制器 Low Input Sync Buck Cntrlr source/sink 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 |
| TPS40022PWP | 制造商:Texas Instruments 功能描述: |
| TPS40040 | 制造商:TI 制造商全称:Texas Instruments 功能描述:LOW PIN COUNT, LOW VIN (2.5 V TO 5.5 V) SYNCHRONOUS BUCK DC-TO-DC CONTROLLER WITH ENABLE |
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