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参数资料
| 型号： | L7980A |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 3.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | ROHS COMPLIANT, HSOP-8 |
| 文件页数： | 30/44页 |
| 文件大小： | 1247K |
| 代理商： | L7980A |
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Application ideas
L7980
36/44
Doc ID 15181 Rev 3
Equation 35
where ISW is the average current in the embedded power MOSFET in the on time.
To chose the right value of the inductor and to manage transient output current, that for short
time can exceed the maximum output current calculated by Equation 35, also the peak
current in the power MOSFET has to be calculated. The peak current, showed in Equation
36, must be lower than the minimum current limit (3.7 A)
Equation 36
Where r is defined as the ratio between the inductor current ripple and the inductor DC
current:
So in the buck boost topology the maximum output current depends on the application
conditions (firstly input and output voltage, secondly switching frequency and inductor
value).
In Figure 34. the maximum output current for the above configuration is depicted varying the
input voltage from 4.5 V to 28 V.
The dashed line considers a more accurate estimation of the duty cycles given by Equation
37, where power losses across diodes, external power MOSFET, internal power MOSFET
are taken into account.
I
SW
I
OUT
1D
–
-------------
2 A
<
=
I
SW,PK
I
OUT
1D
–
-------------
1
r
2
---
+
2.5A
<
=
r
V
OUT
I
OUT
LF
SW
------------------------------------
1D
–
()
2
=
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L7980ATR | 功能描述:直流/直流开关转换器 2 A Step-Down Reg 4.5V to 28V 250 kHz RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| L7980TR | 功能描述:直流/直流开关转换器 2A DC 4.5 V to 28 V Adj 0.6V 250 kHz RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| L7981 | 功能描述:直流/直流开关调节器 3A Step-Down Reg 3A DC 4.5-28V 250Khz 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 |
| L7981A | 制造商:STMicroelectronics 功能描述:POWER CONVERSION - Rail/Tube 制造商:STMicroelectronics 功能描述:3A Step-Down Reg 3.7A 4.5 to 28V 1MHz 制造商:ST 功能描述:3A STEP-DOWN SWITCHING REGULATOR |
| L7981ATR | 功能描述:直流/直流开关调节器 3 A Step-Down Reg 4.5V to 28V 250 kHz 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 |
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