參數(shù)資料
型號(hào)： L5973AD
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 2.3 A SWITCHING REGULATOR, PDSO8
封裝： EXPOSED PAD, HSOP-8
文件頁(yè)數(shù)： 5/22頁(yè)
文件大?。?/td> 486K
代理商： L5973AD
L5973AD
Additional features and protections
Doc ID 9552 Rev 9
13/22
5
Additional features and protections
5.1
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.
5.2
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 intervention will be set at:
Equation 1
Where R1 is the resistor connected between the output voltage and the feedback pin, while
R2 is between the feedback pin and ground.
5.3
Zero load
Due to the fact that the internal power is a PDMOS, no boostrap capacitor is required and
so, the device works properly also with no load at the output. In this condition it works in
burst mode, with random repetition rate of the burst.
5.4
Application circuit
In Figure 8 is shown the demo board application circuit, where the input supply voltage,
VCC, can range from 4 V to 25 V due to the rated voltage of the input capacitor and the
output voltage is adjustable from 1.235 V to VCC.
V
OVP
1.3
R
1
R
2
+
R
2
-------------------- V
FB
=
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L5973AD_07 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2A switch step down switching regulator
L5973AD_08 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2 A switch step down switching regulator
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L5973D_08 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2.5 A switch step down switching regulator?癎
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