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参数资料
| 型号： | L6917D |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封装： | SO-28 |
| 文件页数： | 15/27页 |
| 文件大小： | 411K |
| 代理商： | L6917D |
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L6917
22/27
Figure 16. PCB and Components Layouts
Design Example.
s
Output Voltage (nominal) 1.700V
s
Output Current (nominal) 45A
s
Static tolerance
+100mV; -50mV
Considering the high slope for the load transient, a high switching frequency has to be used. In addition to fast
reaction, this helps in reducing output and input capacitor. Inductance value is also reduced.
A switching frequency of 300kHz for each phase is then considered allowing large bandwidth for the compen-
sation network.
s
Current Reading Network and Over Current:
Since the maximum output current is 45A, the over current threshold has to be set at 140% of the
maximum nominal current, the over-current threshold has then to be set at 31.5A. Considering to sense
the output current across the low-side mosfet RdsON, STB90NF03L has 6.5m
max at 25° that
becomes 9.1m
considering the temperature variation (+40%); the resulting transconductance resistor
Rg has to be:
(R3 to R6)
s
Droop function Design:
Considering a voltage drop of 100mV at full load, the feedback resistor RFB has to be
(R7)
voltage drop at OCP threshold results in 140mV.
Internal SGND Plane
Solder Side
Rg
I
MA X
RdsON
35
-------------------------------------- -
31.5 9.1m
35
------------------------------
8.2k
==
=
R
FB
100mV
50
A
-------------------
2k
==
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6917DTR | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| L6918 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER |
| L6918A | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER |
| L6918AD | 功能描述:DC/DC 开关控制器 Prog Multi-Phase Cnt RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| L6918ADTR | 功能描述:DC/DC 开关控制器 Prog Multi-Phase Cnt RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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