参数资料
型号: MIC2085-JYQS
厂商: Micrel Inc
文件页数: 19/29页
文件大小: 1008K
描述: IC CTRLR HOT SWAP SGL 16-QSOP
标准包装: 98
类型: 热交换控制器
应用: 通用型 Infiniband?
内部开关:
电源电压: 2.3 V ~ 16.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 16-SSOP(0.154",3.90mm 宽)
供应商设备封装: 16-QSOP
包装: 管件
产品目录页面: 1085 (CN2011-ZH PDF)
其它名称: 576-2148
MIC2085-JYQS-ND
Micrel, Inc.
MIC2085/2086
 
 
May 2006 
19
M9999-050406
(408) 955-1690
 
Higher UVLO Setting
Once a PCB is inserted into a backplane (power supply),
the internal UVLO circuit of the MIC2085/86 holds the
GATE output charge pump off until V
CC
 exceeds 2.18V.
If VCC falls below 2V, the UVLO circuit pulls the GATE
output to ground and clears the overvoltage and/or
current limit faults. For a higher UVLO threshold, the
circuit in Figure 7 can be used to delay the output
MOSFET from switching on until the desired input
voltage is achieved. The circuit allows the charge pump
to remain off until VIN exceeds
1.24V
R2
R1
1
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
+
. The
GATE drive output will be shut down when V
IN
  falls
below
1.14V
R2
R1
1
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
+
. In the example circuit (Figure
7), the rising UVLO threshold is set at approximately 11V
and the falling UVLO threshold is established as 10.1V.
The circuit consists of an external resistor divider at the
ON pin that keeps the GATE output charge pump off
until the voltage at the ON pin exceeds its threshold
(V
ON
) and after the start-up time relapses.
 
 
 
Figure 7. Higher UVLO Setting
 
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