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| 型号： | L5973AD |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 2.3 A SWITCHING REGULATOR, PDSO8 |
| 封装： | EXPOSED PAD, HSOP-8 |
| 文件页数： | 5/22页 |
| 文件大小： | 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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相关代理商/技术参数 |
参数描述 |
|---|---|
| L5973AD_07 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:2A switch step down switching regulator |
| L5973AD_08 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:2 A switch step down switching regulator |
| L5973ADTR | 功能描述:直流/直流开关调节器 1.235 to 35V Step-Dn RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| L5973D | 功能描述:开关变换器、稳压器与控制器 1.235 to 35V Step-Dn RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| L5973D_08 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:2.5 A switch step down switching regulator?癎 |
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