参数资料
型号: LT3581EMSE#PBF
厂商: Linear Technology
文件页数: 21/36页
文件大小: 0K
描述: IC REG MULTI CONFIG ADJ 16MSOP
标准包装: 37
类型: 升压(升压),反相,回扫,Sepic
输出类型: 可调式
输出数: 1
输出电压: 1.22 V ~ 42 V
输入电压: 2.5 V ~ 22 V
PWM 型: 电流模式
频率 - 开关: 200kHz ~ 2.5MHz
电流 - 输出: 3.3A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 16-TFSOP(0.118",3.00mm 宽)裸露焊盘
包装: 管件
供应商设备封装: 16-MSOP,裸露焊盘
LT3581
APPLICATIONS INFORMATION
1s/DIV
HOT-PLUG
The high inrush current associated with hot-plugging V IN
can be largely rejected with the use of an external PMOS. A
simple hot-plug controller can be designed by connecting
an external PMOS in series with V IN , with the gate of the
PMOS being driven by the GATE pin of the LT3581. Since
the GATE pin pull-down current is linearly proportional to
the SS voltage, and the SS charge up time is relatively slow,
the GATE pin pull-down current will increase gradually,
thereby turning on the external PMOS slowly. Controlled
in this manner, the PMOS acts as an input current limiter
when V IN hot-plugs or ramps up sharply.
Likewise, when the PMOS is connected in series with the
output, inrush currents into the output capacitor can be
limited during a hot-plug event. To illustrate this, the circuit
in Figure 18 was re-configured by adding a large 1500μF
capacitor to the output. An 18Ω resistive load was used
and a 2.2μF capacitor was placed on SS. Figure 14 shows
the results of hot-plugging this re-configured circuit. Notice
how the inductor current is well behaved.
V IN
5V/DIV
V OUT
10V/DIV
I L
5A/DIV
SS
1V/DIV
3581 F14
Figure 14. Inrush Current Is Well Controlled in Spite Of Hot-
Plugging the Re-configured Boost Converter in Figure 18
3581fa
For more information www.linear.com/LT3581
21
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