參數(shù)資料
型號(hào): MAX5948BESA+T
廠商: Maxim Integrated
文件頁(yè)數(shù): 15/18頁(yè)
文件大?。?/td> 182K
描述: IC CNTRLR HOT SWAP 8-SOIC
產(chǎn)品培訓(xùn)模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝: 2,500
類(lèi)型: 熱交換控制器
應(yīng)用: 通用
內(nèi)部開(kāi)關(guān): 無(wú)
電源電壓: -20 V ~ -80 V
工作溫度: -40°C ~ 85°C
安裝類(lèi)型: 表面貼裝
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 8-SOIC
包裝: 帶卷 (TR)
Applications Information
(Refer to the Typical Operating Circuit.)
Sense Resistor
The circuit-breaker threshold is set to 50mV (typically).
Select a sense resistor that causes a drop equal to or
above the current-limit threshold at a current level above
the maximum normal operating current. Typically, set the
overload current to 1.5 to 2.0 times the nominal load cur-
rent plus the load-capacitance charging current during
startup. Choose the sense resistor power rating to be
greater than (V
CB
)
2
/ R
SENSE
.
Component Selection Procedure
"   Determine load capacitance:
C
L
= C3 + C4 + module input capacitance
"   Determine load current, I
LOAD
.
"   Select circuit-breaker current, for example:
I
CB
= 2 x I
LOAD
"   Calculate R
SENSE
:
Realize that I
CB
varies ?0% due to trip-voltage
tolerance.
"   Set allowable inrush current:
"   Determine value of C2:
"   Calculate value of C1:
C    C    C    x
V
V
V
gd
IN MAX
GS TH
GS TH
1
2
=
+

?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
(
)
(
)
(   )
(   )
C
A x C
I
L
INRUSH
2
45
=
?/DIV>
I
x
mV
R
I
or
I
I
x I
INRUSH
SENSE
LOAD
INRUSH
LOAD
CB MIN
d

+
d
0 8
40
0 8
.
.
(
)
R
mV
I
SENSE
CB
=
50
-48V Hot-Swap Controllers
with External R
SENSE
______________________________________________________________________________________   15
V
EE
SENSE
GATE
DRAIN
V
DD
OV
UV
PWRGD
MAX5948A
GND
(SHORT PIN)
-48V
R4
562k&
1%
R5
9.09k&
1%
R6
10k&
1%
R1
0.02&
5%
R3
18k&
5%
R2
10&
5%
C1
150nF
25V
Q1
IRF530
C2
3.3nF
100V
C3
100礔
100V
*
GND
*DIODES INC. SMAT70A.
MOC207
R7
51k&
5%
PWRGD
Figure 14. Using PWRGD to Drive an Optoisolator
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