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參數(shù)資料
| 型號(hào)： | PT7681 |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | PFC Ballast Control in a 16-pin DIP package; Similar to IR2166 with Lead Free Packaging |
| 中文描述： | 2V至3.5V的30A條。 5 - V輸入可編程ISR的瓦特/保證金控制 |
| 文件頁(yè)數(shù)： | 5/10頁(yè) |
| 文件大小： | 187K |
| 代理商： | PT7681 |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT7680 Series
used it is important to at least connect the Sense(–) pin
to GND locally, as this provides a return path for the
regulator’s internal bias currents.
With the sense leads connected, the difference between
the voltage measured between the V
out
and GND pins,
and that measured between the Sense(+) and Sense(–)
pins, is the amount of IR drop being compensated by the
regulator. This should be limited to 0.6V. (0.3V maximum
between pins 25 & 26, and also between pins 12 & 13).
Note: The remote sense feature is not designed to compensate
for the forward drop of non-linear or frequency dependent
components that may be placed in series with the converter
output. Examples include OR-ing diodes, filter inductors,
ferrite beads, and fuses. When these components are enclosed
by the remote sense connections they are effectively placed
inside the regulation control loop, which can adversely affect
the stability of the regulator.
Margin Up/Margin Down
The
MARGUP
/
MARGDN
controls allow up to a 5%
momentary adjustment of the regulator’s output voltage
set point. This adjustment is independent of the VID
control inputs and provides a convenient method for
testing the load circuit’s supply voltage margins. A 5%
adjustment is made by simply connecting either control
input directly to the remote sense ground. Adjustments
of less than 5% can be accommodated by grounding the
input through a suitably sized padding resistor.
Note: These inputs must be controlled with a low-leakage
(<1μA) open-collector/open-drain transistor. Do not add pull-
up resistors or use a push-pull logic gate to drive these pins.
Over-Temperature Protection
The PT7680 series of ISRs incorporates an on-board
temperature sensor, which protects the module’s internal
circuitry against excessively high temperatures. A rise in
the temperature of the internal components may be the
result of a drop in airflow, or a high ambient temperature.
If the module’s internal temperature exceeds its OTP
threshold (see data sheet specifications), the regulator
output is disabled and the output voltage is reduced to
zero. The recovery is automatic, and begins with a soft-
start power up. It occurs when the the sensed temperature
decreases by about 10°C below the trip point.
Note: The over-temperature protection is a last resort mecha-
nism to prevent thermal stress to the regulator. Operation at
or close to the thermal shutdown temperature is not recom-
mended and will reduce the long-term reliability of the module.
Always operate the regulator within the specified Safe Operating
Area (SOA) limits for the worst-case conditions of ambient
temperature and airflow.
Over-Current Protection
To protect against load faults, the PT7680 series of regula-
tors incorporates output over-current protection. Applying
a load that exceeds the regulator’s over-current threshold
(see data sheet specifications) will cause the regulated
output to shut down. Following shutdown the ISR will
periodically attempt to recover by initiating a soft-start
power-up. This is often described as a “hiccup” mode
of operation, whereby the module continues in a cycle of
shutdown and power up until the load fault is removed.
During this period, the average current flowing into the
fault is significantly reduced. Once the fault is removed,
the converter automatically recovers to normal operation.
Differential Remote Sense
Connecting the Sense(+) and Sense(-) pins to the load
circuit allows the regulator to compensate for limited
amounts of ‘IR’ voltage drop. This voltage drop is caused
by current flowing through the trace resistance between
the power converter and the ‘point of regulation’ some
distance away. Although not recommended, leaving the
sense pins disconnected will not damage the regulator.
An internal 15
resistor, connected between each sense
pin and its corresponding output node, keeps the output
voltage in regulation. If the remote sense feature is not
Operating Features and System Considerations
for the PT7680 Series of ISRs
Power up & Soft-Start Timing
Following either the application of a valid input source
voltage, or the removal of a ground signal to the
STBY
control pin (with input power applied), the regulator will
initiate a soft-start power up. The soft start slows the
rate at which the output voltage rises, and also introduces a
power-up characteristic of a PT7681 with a 15-A load,
and with the output voltage programmed to 3.3V.
Vo (2V/Div)
Iin (10A/Div)
Vin (2V/Div)
HORIZ SCALE: 10ms/Div
Figure 1-1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PT7681A | 功能描述:REG 2-3.5V 30A 5VIN PROG HORZ RoHS:否 類別:電源 - 板載 >> DC DC Converters 系列:PT7680 設(shè)計(jì)資源:Maxi/Mini/Micro Design Guide, Appl Manual 標(biāo)準(zhǔn)包裝:1 系列:Maxi 類型: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:* |
| PT7681C | 功能描述:REG 2-3.5V 30A 5VIN PROG SMD RoHS:否 類別:電源 - 板載 >> DC DC Converters 系列:PT7680 設(shè)計(jì)資源:Maxi/Mini/Micro Design Guide, Appl Manual 標(biāo)準(zhǔn)包裝:1 系列:Maxi 類型: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:* |
| PT7681N | 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 2V-3.5V 30A 5V Inp Programmable ISR RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| PT76D | 制造商:Pentair Technical Products / Hoffman 功能描述:Solid Top 700x600mm LtGray, fits 700x600mm, Steel |
| P-T76D | 制造商:PENTAIR TECNICAL PRODCUTS 功能描述:Solid Top 700x600mm |
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