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Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT7670 Series
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
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 0.6 V (0.3 V 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.
Over-Temperature Protection
The PT7670 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 PT7670 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 the cycle
of successive 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 and returns
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
Operating Features and System Considerations
for the PT7670 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
short time delay of approx. 10ms. Figure 1-1 shows the
power-up characteristic of a PT7671 with a 15-A load,
and with the output voltage programmed to 3.3 V.
Vo (2V/Div)
Iin (10A/Div)
Vin (2V/Div)
HORIZ SCALE: 10ms/Div
Figure 1-1
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PT7673 | Half Bridge Driver, LO In Phase with RT, Programmable Oscillating Frequency, 0.6us Deadtime in a 8-pin DIP package and differenct phase; Similar to IR21531D with Lead Free Packaging |
| PT7675 | Ballast Control, Below Resonance Protection, Thermal Overload Protection, Protection from Failure to Strike, Programmable Preheat Time and Run Frequency, Programmable Deadtime, Automatic Restart for Lamp Exchange in a 16-pin DIP package; A IR21571 with Standard Packaging |
| PT7712 | 600V Half Bridge Driver LED Buck Regulator in a 8-Pin SOIC Package; A IRS2541 packaged in a Lead-Free 8-Lead SOIC shipped on Tape and Reel |
| PT7713 | 200V Half Bridge Driver LED Buck Regulator in a 8-Lead Dip Package; A IRS2540 packaged in a Lead-Free 8-Lead DIP |
| PT7714 | 200V Half Bridge Driver LED Buck Regulator in a 8-Pin SOIC Package; A IRS2540 packaged in a Lead-Free 8-Lead SOIC shipped on Tape and Reel |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PT7671-5V | 制造商:TI 制造商全稱:Texas Instruments 功能描述:30-A Programmable Integrated Switching Regulator |
| PT7671A | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 1.3V to 3.5V 32A 5V Input Prog 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 |
| PT7671C | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 1.3V to 3.5V 32A 5V Input Prog 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 |
| PT7671N | 功能描述:REG PROG 1.3-3.5V 30A 5VIN VERT RoHS:否 類別:電源 - 板載 >> DC DC Converters 系列:PT7670 設(shè)計資源:VI-200, VI-J00 Design Guide, Appl Manual 標準包裝:1 系列:* 類型:隔離 輸出數(shù):1 電壓 - 輸入（最小）:55V 電壓 - 輸入（最大）:100V Voltage - Output 1:15V Voltage - Output 2:- Voltage - Output 3:- 電流 - 輸出（最大）:* 電源（瓦） - 制造商系列:200W 電壓 - 隔離:* 特點:* 安裝類型:通孔 封裝/外殼:9-FinMod 尺寸/尺寸:4.60" L x 1.86" W x 0.79" H（116.8mm x 47.2mm x 20.1mm） 包裝:散裝 工作溫度:-55°C ~ 85°C 效率:* 電源（瓦特）- 最大:* |
| PT7673 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:0.8V to 1.575V 30A. 5-V Input Programmable ISR |
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