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參數(shù)資料
| 型號： | TPS61041DRV |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | LOW-POWER DC/DC BOOST CONVERTER IN SOT-23 AND SON PACKAGES |
| 中文描述： | 低功耗DC / DC升壓轉(zhuǎn)換器采用SOT - 23和兒子套票 |
| 文件頁數(shù)： | 3/22頁 |
| 文件大?。?/td> | 491K |
| 代理商： | TPS61041DRV |
www.ti.com
DETAILED DESCRIPTION
OPERATION
The TPS61040/41 operates with an input voltage range of 1.8 V to 6 V and can generate output voltages up to
28 V. The device operates in a pulse-frequency-modulation (PFM) scheme with constant peak current control.
This control scheme maintains high efficiency over the entire load current range, and with a switching frequency
up to 1 MHz, the device enables the use of very small external components.
PEAK CURRENT CONTROL
The internal switch turns on until the inductor current reaches the typical dc current limit (I
LIM
) of 400 mA
(TPS61040) or 250 mA (TPS61042). Due to the internal propagation delay of typical 100 ns, theactualcurrent
exceeds the dc current limit threshold by a small amount. The typical peak current limit can be calculated:
Ipeak(typ)
ILIM
VIN
L
100 ns
Ipeak(typ)
400 mA
VIN
L
VIN
L
100 ns for the TPS61040
Ipeak(typ)
250 mA
100 ns for the TPS61041
(1)
TPS61040
TPS61041
SLVS413C–OCTOBER 2002–REVISED AUGUST 2007
Table 1. Terminal Functions
TERMINAL
DBV NO.
I/O
DESCRIPTION
NAME
DRV NO.
This is the enable pin of the device. Pulling this pin to ground forces the device into shutdown
mode reducing the supply current to less than 1
μ
A. This pin should not be left floating and needs
to be terminated.
This is the feedback pin of the device. Connect this pin to the external voltage divider to program
the desired output voltage.
Ground
No connection
Connect the inductor and the Schottky diode to this pin. This is the switch pin and is connected to
the drain of the internal power MOSFET.
Supply voltage pin
EN
4
3
I
FB
3
4
I
GND
NC
2
–
1
5
–
–
SW
1
6
I
V
IN
5
2
I
The converter monitors the output voltage, and as soon as the feedback voltage falls below the reference voltage
of typically 1.233 V, the internal switch turns on and the current ramps up. The switch turns off as soon as the
inductor current reaches the internally set peak current of typically 400 mA (TPS61040) or 250 mA (TPS61041).
See the
Peak Current Control
section for more information. The second criteria that turns off the switch is the
maximum on-time of 6
μ
s (typical). This is just to limit the maximum on-time of the converter to cover for extreme
conditions. As the switch is turned off the external Schottky diode is forward biased delivering the current to the
output. The switch remains off for a minimum of 400 ns (typical), or until the feedback voltage drops below the
reference voltage again. Using this PFM peak current control scheme the converter operates in discontinuous
conduction mode (DCM) where the switching frequency depends on the output current, which results in very high
efficiency over the entire load current range. This regulation scheme is inherently stable, allowing a wider
selection range for the inductor and output capacitor.
The higher the input voltage and the lower the inductor value, the greater the peak.
By selecting the TPS61040 or TPS61041, it is possible to tailor the design to the specific application current limit
requirements. A lower current limit supports applications requiring lower output power and allows the use of an
inductor with a lower current rating and a smaller form factor. A lower current limit usually has a lower output
voltage ripple as well.
Copyright 2002–2007, Texas Instruments Incorporated
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參數(shù)描述 |
|---|---|
| TPS61041DRVR | 功能描述:LED照明驅(qū)動器 28V 250-mA Sw Boost Converter RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| TPS61041DRVRG4 | 功能描述:LED照明驅(qū)動器 28V 250-mA Sw Boost Converter RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| TPS61041DRVT | 功能描述:LED照明驅(qū)動器 28V 250mA Sw Boost Converter RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| TPS61041DRVTG4 | 功能描述:LED照明驅(qū)動器 28V 250-mA Sw Boost Converter RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| TPS61041-Q1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOW POWER DC/DC BOOST CONVERTER IN SOT-23 PACKAGE |
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