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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參數(shù)描述 |
| MAX5949AESA |
功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5949AESA+ |
功能描述:熱插拔功率分布 48V- Hot-Swap Controller RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5949AESA+T |
功能描述:熱插拔功率分布 48V- Hot-Swap Controller RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5949AESA+TG126 |
制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX5949AESA-T |
功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
