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參數資料
| 型號： | TPS61040DBV |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | LOW POWER DC/DC BOOST CONVERTER IN SOT-23 PACKAGE |
| 中文描述： | 低功率DC / DC升壓轉換器SOT - 23封裝 |
| 文件頁數： | 12/18頁 |
| 文件大?。?/td> | 299K |
| 代理商： | TPS61040DBV |
www.ti.com
LINE AND LOAD REGULATION
The line regulation of the TPS61040/41 depends on the voltage ripple on the feedback pin. Usually a 50 mV
peak-to-peak voltage ripple on the feedback pin FB gives good results.
OUTPUT CAPACITOR SELECTION
For best output voltage filtering, a low ESR output capacitor is recommended. Ceramic capacitors have a low
ESR value but tantalum capacitors can be used as well, depending on the application.
Vout
Iout
Cout
fS(1
IP
L
Vout
Vd–Vin
IP
ESR
(7)
TPS61040
TPS61041
SLVS413B–OCTOBER 2002–REVISED MAY 2004
The larger the feedforward capacitor the worse the line regulation of the device. Therefore, when concern for line
regulation is paramount, the selected feedforward capacitor should be as small as possible. See the next section
for more information about line and load regulation.
Some applications require a very tight line regulation and can only allow a small change in output voltage over a
certain input voltage range. If no feedforward capacitor C
FF
is used across the upper resistor of the voltage
feedback divider, the device has the best line regulation. Without the feedforward capacitor the output voltage
ripple is higher because the TPS61040/41 shows output voltage bursts instead of single pulses on the switch pin
(SW), increasing the output voltage ripple. Increasing the output capacitor value reduces the output voltage
ripple.
If a larger output capacitor value is not an option, a feedforward capacitor C
FF
can be used as described in the
previous section. The use of a feedforward capacitor increases the amount of voltage ripple present on the
feedback pin (FB). The greater the voltage ripple on the feedback pin (
≥
50 mV), the worse the line regulation.
There are two ways to improve the line regulation further:
1. Use a smaller inductor value to increase the switching frequency which will lower the output voltage ripple,
as well as the voltage ripple on the feedback pin.
2. Add a small capacitor from the feedback pin (FB) to ground to reduce the voltage ripple on the feedback pin
down to 50 mV again. As a starting point, the same capacitor value as selected for the feedforward capacitor
C
FF
can be used.
Assuming the converter does not show double pulses or pulse bursts on the switch node (SW), the output
voltage ripple can be calculated as:
Where:
I
P
= Peak current as described in the previous
peak current control
section
L = Selected inductor value
I
out
= Nominal load current
fS (I
out
) = Switching frequency at the nominal load current as calculated previously
Vd = Rectifier diode forward voltage (typically 0.3V)
C
out
= Selected output capacitor
ESR = Output capacitor ESR value
Refer to Table 2 and
typical applications
section for choosing the output capacitor.
Table 2. Recommended Input and Output Capacitors
DEVICE
CAPACITOR
4.7 μF/X5R/0805
10 μF/X5R/0805
1.0 μF/X7R/1206
1.0 μF/X5R/1206
4.7 μF/X5R/1210
VOLTAGE RATING
6.3 V
6.3 V
25 V
35 V
25 V
COMPONENT SUPPLIER
Tayo Yuden JMK212BY475MG
Tayo Yuden JMK212BJ106MG
Tayo Yuden TMK316BJ105KL
Tayo Yuden GMK316BJ105KL
Tayo Yuden TMK325BJ475MG
COMMENTS
C
IN
/C
OUT
C
IN
/C
OUT
C
OUT
C
OUT
C
OUT
TPS61040/41
12
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS61040DBVR | 功能描述:LED照明驅動器 28-V 400-mA Switch 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 |
| TPS61040DBVR | 制造商:Texas Instruments 功能描述:Power Supply IC |
| TPS61040DBVRG4 | 功能描述:LED照明驅動器 28-V 400-mA Switch 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 |
| TPS61040DBVT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| TPS61040DDCR | 功能描述:LED照明驅動器 28V,400mA Switch 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 |
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