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參數(shù)資料
| 型號(hào)： | PT5548 |
| 英文描述： | 200V Single N-Channel HEXFET Power MOSFET in a D2-Pak package; Similar to IRFS17N20D with Lead Free Packaging |
| 中文描述： | 12.6V的第1A。 5 - V輸入步升（升壓）ISR的 |
| 文件頁(yè)數(shù)： | 5/7頁(yè) |
| 文件大?。?/td> | 174K |
| 代理商： | PT5548 |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT5540 Series
Features and System Considerations for the
PT5540 Series of Boost ISRs
Boost Regulator Topology and Characteristics
Figure 1-1 shows a block diagram of the boost regulator
circuit, which is representative of the PT5540 ISR series.
Note that when the MOSFET switch is off, the output
regulator is connected directly to the input via an inductor
and schottky diode. Thus with the MOSFET switch inac-
tive, the output voltage merely tracks the input voltage,
less the forward voltage drop of the diode.
Figure 1-1; Boost Regulator Block Diagram
Output
Capacitor
Inductor
PWM
V
IN
V
OUT
COM
MOSFET
Switch
Schottky Diode
Vo (5V/Div)
Vin (5V/Div)
Iin (1A/Div)
HORIZ SCALE: 40ms/Div
Fiigure 1-2; Typical Power Up Waveforms for the PT5542
One of the characteristic of a boost regulator is that its
input current is always higher than its output current.
For example, a 12-W rated 5V to 12V boost regulator,
operating at 80% efficiency, will demand 15W of input
power. Thus a 1-A load on the regulator’s output will
correlate to 3-A of input current from its source. And
any fall (droop) in the input voltage will corrspondingly
result in the input current rising further. The input current
demanded by a boost regulator is therefore high, making it
important that the regulator be connected to a low imped-
ance source.
Under-Voltage Lockout (UVLO)
The PT5540 series of boost regulators incorporate an
input under-voltage lockout (UVLO). The UVLO pre-
vents operation of the regulator until the input voltage is
above the UVLO threshold (see data sheet specifications).
This prevents the regulator from drawing a high startup
current during power up, and minimizes the current drain
from the input source during low input voltage conditions.
Note: Below the UVLO threshold, the regulator’s internal
MOSFET is merely held ‘off’, disabling its boost function.
Under this condition the regulator will still produce an output
voltage. This is the input voltage less the forward voltage drop
of the internal schottky diode.
Soft-Start Power Up
When the input source voltage rises above the UVLO
threshold voltage the regulator will initiate a soft-start
power up. The soft-start circuitry introduces a short
time delay and slows the rate at which the output rises
to full regulation voltage. Figure 1-2 shows the power-up
characteristic of a PT5542 (15V) regulator. After the
application of the input voltage, V
in
, there is a delay of
approximately 100ms before the output voltage rises
above the input voltage. This delay provides more time
for a slow rising input source to reach the minimum
operating voltage of 4.5V. The waveforms of Figure 1-2
were measured with a 5Vdc input voltage and 0.5-Adc
constant current load.
Input Source Requirements
As the input current is much higher than the output load
current, boost regulators are sensitive to source voltage
impedance. This is especially during power up when a
regulator attempts to start at too low an input voltage.
The UVLO built into the PT5540 series reduces the input
current during startup by disabling the boost function until
the source voltage has almost reached the minimum oper-
ating voltage of 4.5V. However, the UVLO circuitry will
also promptly switch off the regulator if this voltage sags
as the input current rises. This is often described as a
“hiccup” effect. The module may hiccup at power up due
to a combination of two conditions. The input voltage is
rising too slowly and its source impedance is not low
enough. To ensure a clean power-up the output impedance
of the input source should be less than 25m
. A higher
input impedance can be tolerated if the input voltage
rises promptly and regulates closer to the nominal input
voltage of 5V.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PT5548A | 功能描述:REG 12.6V 1A 4.5/9VIN HORZ RoHS:否 類(lèi)別:電源 - 板載 >> DC DC Converters 系列:PT5540 設(shè)計(jì)資源:Maxi/Mini/Micro Design Guide, Appl Manual 標(biāo)準(zhǔn)包裝:1 系列:Maxi 類(lèi)型:隔離 輸出數(shù):1 電壓 - 輸入（最?。?43V 電壓 - 輸入（最大）:110V Voltage - Output 1:15V Voltage - Output 2:- Voltage - Output 3:- 電流 - 輸出（最大）:* 電源（瓦） - 制造商系列:400W 電壓 - 隔離:* 特點(diǎn):* 安裝類(lèi)型:通孔 封裝/外殼:模塊 尺寸/尺寸:4.60" L x 2.20" W x 0.54" H（116.8mm x 55.9mm x 13.7mm） 包裝:散裝 工作溫度:-55°C ~ 100°C 效率:* 電源（瓦特）- 最大:* |
| PT5548C | 功能描述:REG 12.6V 1A 4.5/9VIN SMD RoHS:否 類(lèi)別:電源 - 板載 >> DC DC Converters 系列:PT5540 設(shè)計(jì)資源:Maxi/Mini/Micro Design Guide, Appl Manual 標(biāo)準(zhǔn)包裝:1 系列:Maxi 類(lèi)型:隔離 輸出數(shù):1 電壓 - 輸入（最小）:43V 電壓 - 輸入（最大）:110V Voltage - Output 1:15V Voltage - Output 2:- Voltage - Output 3:- 電流 - 輸出（最大）:* 電源（瓦） - 制造商系列:400W 電壓 - 隔離:* 特點(diǎn):* 安裝類(lèi)型:通孔 封裝/外殼:模塊 尺寸/尺寸:4.60" L x 2.20" W x 0.54" H（116.8mm x 55.9mm x 13.7mm） 包裝:散裝 工作溫度:-55°C ~ 100°C 效率:* 電源（瓦特）- 最大:* |
| PT5548N | 功能描述:REG 12.6V 1A 4.5/9VIN VERT RoHS:否 類(lèi)別:電源 - 板載 >> DC DC Converters 系列:PT5540 設(shè)計(jì)資源:Maxi/Mini/Micro Design Guide, Appl Manual 標(biāo)準(zhǔn)包裝:1 系列:Maxi 類(lèi)型:隔離 輸出數(shù):1 電壓 - 輸入（最?。?43V 電壓 - 輸入（最大）:110V Voltage - Output 1:15V Voltage - Output 2:- Voltage - Output 3:- 電流 - 輸出（最大）:* 電源（瓦） - 制造商系列:400W 電壓 - 隔離:* 特點(diǎn):* 安裝類(lèi)型:通孔 封裝/外殼:模塊 尺寸/尺寸:4.60" L x 2.20" W x 0.54" H（116.8mm x 55.9mm x 13.7mm） 包裝:散裝 工作溫度:-55°C ~ 100°C 效率:* 電源（瓦特）- 最大:* |
| PT55928B | 制造商:EVERLIGHT 制造商全稱(chēng):Everlight Electronics Co., Ltd 功能描述:Phototransistor |
| PT55928BL2 | 制造商:EVERLIGHT 制造商全稱(chēng):Everlight Electronics Co., Ltd 功能描述:Phototransistor |
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