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參數資料
| 型號： | TCV7104FN |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 3 X 3 MM, 0.65 MM PITCH, PLASTIC, SON-8 |
| 文件頁數： | 15/16頁 |
| 文件大?。?/td> | 272K |
| 代理商： | TCV7104FN |
TCV7104FN
2010-03-23
8
Thermal Shutdown (TSD)
The TCV7104FN provides thermal shutdown. When the junction temperature continues to rise and reaches
TSD (150°C typ.), the TCV7104FN goes into thermal shutdown and shuts off the power supply. TSD has a
hysteresis of about 15°C (typ.). The device is enabled again when the junction temperature has dropped by
approximately 15°C from the TSD trip point. The device resumes the power supply when the soft-start circuit is
activated upon recovery from TSD state.
Thermal shutdown is intended to protect the device against abnormal system conditions. It should be ensured
that the TSD circuit will not be activated during normal operation of the system.
Figure 5 Thermal Shutdown Operation
Usage Precautions
The input voltage, output voltage, output current and temperature conditions should be considered when
selecting capacitors, inductors and resistors. These components should be evaluated on an actual system
prototype for best selection.
External components such as capacitors, inductors and resistors should be placed as close to the TCV7104FN as
possible.
The TCV7104FN has an ESD diode between the EN and VIN2 pins. The voltage between these pins should
satisfy VEN VIN2 < 0.3 V.
CIN should be connected as close to the PGND and VIN1 pins as possible. Operation might become unstable due
to board layout. In that case, add a decoupling capacitor (CC) of 0.1 μF to 1 μF between the SGND and VIN2 pins.
The minimum programmable output voltage is 0.8 V (typ.). If the difference between the input and output
voltages is small, the output voltage might not be regulated accurately and fluctuate significantly.
When TCV7104FN is in operation, a negative voltage is generated since regeneration current flows through the
switch pin (LX). Even if the current flows through the low side parasitic diode during the dead time of switching
transistor, operation is undisturbed so an external flywheel diode is unnecessary. If there is the possibility of an
external negative voltage generation, add a diode for protection.
SGND pin is connected with the back of IC chip and serves as the heat radiation pin. Secure the area of a GND
pattern as large as possible for greater of heat radiation.
The overcurrent protection circuits in the Product are designed to temporarily protect Product from minor
overcurrent of brief duration. When the overcurrent protective function in the Product activates, immediately
cease application of overcurrent to Product. Improper usage of Product, such as application of current to Product
exceeding the absolute maximum ratings, could cause the overcurrent protection circuit not to operate properly
and/or damage Product permanently even before the protection circuit starts to operate.
The thermal shutdown circuits in the Product are designed to temporarily protect Product from minor
overheating of brief duration. When the overheating protective function in the Product activates, immediately
correct the overheating situation. Improper usage of Product, such as the application of heat to Product
exceeding the absolute maximum ratings, could cause the overheating protection circuit not to operate properly
and/or damage Product permanently even before the protection circuit starts to operate.
Soft start
TSD detection
temperature: TSD
GND
Switching operation stops
Recovery from TSD
Switching operation starts
VOUT
0
Tj
Hysteresis:
ΔTSD
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相關代理商/技術參數 |
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| TCV7104FN(TE85L,F) | 功能描述:直流/直流開關轉換器 2.7 to 5.5V 1500kHz 2A 1Ch DC DC Conv RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| TCV7105F | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:Buck DC-DC Converter IC |
| TCV7106FN | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:Buck DC-DC Converter IC |
| TCV7106FN(TE85L,F) | 功能描述:直流/直流開關轉換器 2.7 to 5.5V 550kHz 2.5A at 3.3V .12 Ohm RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| TCV7107F | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:Buck DC-DC Converter IC |
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