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參數(shù)資料
| 型號： | L5970D |
| 廠商： | 意法半導體 |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 8/11頁 |
| 文件大?。?/td> | 135K |
| 代理商： | L5970D |
L5970AD
8/11
3.8 THERMAL SHUTDOWN
The shutdown block generates a signal that turns off the power stage if the temperature of the chip goes higher
than a fixed internal threshold (150°C). The sensing element of the chip is very close to the PDMOS area, so
ensuring an accurate and fast temperature detection. An hysteresis of approximately 20°C avoids that the de-
vices turns on and off continuously
4
Additional Features and Protections
4.1 FEEDBACK DISCONNECTION
In case of feedback disconnection, the duty cycle increases versus the maximum allowed value, bringing the
output voltage close to the input supply. This condition could destroy the load.
To avoid this dangerous condition, the device is turned off if the feedback pin remains floating.
4.2 OUTPUT OVERVOLTAGE PROTECTION
The overvoltage protection, OVP, is realized by using an internal comparator, which input is connected to the
feedback, that turns off the power stage when the OVP threshold is reached. This threshold is typically 30%
higher than the feedback voltage.
When a voltage divider is requested for adjusting the output voltage (see test application circuit), the OVP inter-
vention will be set at:
Where R
1
is the resistor connected between the output voltage and the feedback pin, while R
2
is between the
feedback pin and ground.
4.3 ZERO LOAD
Due to the fact that the internal power is a PDMOS, no boostrap capacitor is required and so, the device works prop-
erly also with no load at the output. In this condition it works in burst mode, with random repetition rate of the burst.
5
L5970AD belongs to L597x family.
Related part numbers are:
L5970D: 1.5A (I
sw
), 250KHz Step Down DC-DC Converter in SO8
●
L5972D: 2A (I
sw
), 250KHz Step Down DC-DC Converter in SO8
●
L5973AD: 2A (I
sw
), 500KHz Step Down DC-DC Converter in HSOP8
●
L5973D: 2.5A (I
sw
), 250KHz Step Down DC-DC Converter in HSOP8
In case higher current is needed, the nearest DC-DC Converter family is L497x.
Application Ideas
●
V
OVP
1.3
R
--------------------
V
FB
R
2
+
R
2
=
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L5970D013TR | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| L5971 | Isolated Flyback Switching Regulator with 9V Output |
| L5971D | Isolated Flyback Switching Regulator with 9V Output |
| L5972D013TR | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| L5972 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L5970D_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Up to 1A step down switching regulator |
| L5970D_0710 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Up to 1A step down switching regulator |
| L5970D013 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:UP TO 1A STEP DOWN SWITCHING REGULATOR |
| L5970D013TR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.2 to 35V Step-Down RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L5971 | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1.26 to 20V Step-Dwn RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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