參數(shù)資料
型號(hào)： MIC2086-MBQS TR
廠商： Micrel Inc
文件頁數(shù)： 19/29頁
文件大?。?/td> 1008K
描述： IC CTRLR HOW SWAP SGL 20-QSOP
標(biāo)準(zhǔn)包裝： 2,500
類型： 熱交換控制器
應(yīng)用： 通用型 Infiniband?
內(nèi)部開關(guān)： 無
電源電壓： 2.3 V ~ 16.5 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 20-SSOP（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 20-QSOP
包裝： 帶卷 (TR)
其它名稱： MIC2086-MBQSTR
MIC2086-MBQSTR-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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