參數(shù)資料
型號(hào)： TPS40020PWP
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 0.01 A SWITCHING CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, PDSO16
封裝： GREEN, PLASTIC, HTSSOP-16
文件頁(yè)數(shù)： 5/36頁(yè)
文件大小： 724K
代理商： TPS40020PWP
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)
相關(guān)PDF資料
PDF描述
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
TPS40020PWPRG4 0.01 A SWITCHING CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, PDSO16
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS40020PWPG4 功能描述:DC/DC 開關(guān)控制器 Enh Lo Input Freq Sync. Buck Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
TPS40020PWPR 功能描述:DC/DC 開關(guān)控制器 Enh Lo Input Freq Sync. Buck Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
TPS40020PWPRG4 功能描述:DC/DC 開關(guān)控制器 Enh Lo Input Freq Sync. Buck Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
TPS40021 制造商:TI 制造商全稱:Texas Instruments 功能描述:ENHANCED LOW INPUT VOLTAGE MODE SYNCHRONOUS BUCK CONTROLLER
TPS40021EVM-001 功能描述:電源管理IC開發(fā)工具 High-Eff Synch Buck Conv RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
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