參數(shù)資料
型號(hào)： MAX5921
廠商： Maxim Integrated Products, Inc.
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： -48V Hot-Swap Controllers with External Rsense and High Gate Pulldown Current
中文描述： -48V熱插拔控制器，外置RSENSE、提供較高的柵極下拉電流
文件頁(yè)數(shù)： 14/18頁(yè)
文件大?。?/td> 313K
代理商： MAX5921
M
-48V Hot-Swap Controllers with External
R
SENSE
and High Gate Pulldown Current
14
______________________________________________________________________________________
Component Selection Procedure:
Determine load capacitance:
C
L
= C2 + C3 + 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 ±20% due to trip-voltage tol-
erance.
Set allowable inrush current:
Determine value of C2:
Calculate value of C1:
Determine value of R3:
Set R2 = 10
.
If an optocoupler is utilized as in Figure 14, deter-
mine the LED series resistor:
V
IN NOMINAL
7
3
≤
Although the suggested optocoupler is not specified for
operation below 5mA, its performance is adequate for
36V temporary low-line voltage where LED current
would then be
≈
2.2mA to 3.7mA. If R7 is set as high as
51k
, optocoupler operation should be verified over
the expected temperature and input voltage range to
ensure suitable operation when LED current
≈
0.9mA for
48V input and
≈
0.7mA for 36V input.
If input transients are expected to momentarily raise the
input voltage to >100V, select an input transient-voltage-
suppression diode (TVS) to limit maximum voltage on the
MAX5921/MAX5939 to less than 100V. A suitable device
is the Diodes Inc. SMAT70A telecom-specific TVS.
Select Q1 to meet supply voltage, load current, efficien-
cy, and Q1 package power-dissipation requirements:
BV
DSS
≥
100V
I
D(ON)
≥
3 x I
LOAD
DPAK, D
2
PAK, or TO-220AB
R
V
I
mA
5
LED
2
(
)
=
≤
R
s
C
3
150
2
=
μ
C
C
(
C
x
V
V
V
gd
IN MAX
(
GS TH
(
)
GS TH
(
1
2
=
+
)
)
)
C
A x C
μ
I
L
INRUSH
2
45
=
I
x
mV
R
I
or
I
I
x I
INRUSH
SENSE
≤
LOAD
INRUSH
LOAD
CB MIN
(
≤
+
0 8
.
40
0 8
.
)
R
mV
I
SENSE
CB
=
50
MAX5921A
MAX5921E
MAX5939A
MAX5939E
V
EE
OV
UV
SENSE
GATE
DRAIN
PWRGD
V
DD
GND
-48V
C3
100
μ
F
100V
C2
15nF
100V
R3
1k
5%
R2
10
5%
Q1
IRF530
R1
0.02
5%
R4
549k
1%
R5
6.49k
1%
R6
10k
1%
PWRGD
*DIODES INC. SMAT70A
R7
51k
5%
-48V RTN
(SHORT PIN)
*
Figure 13. Using
PWRGD
to Drive an Optoisolator
相關(guān)PDF資料
PDF描述
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MAX5921AESA+ 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
MAX5921AESA+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
MAX5921AESA-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
MAX5921AEVKIT 功能描述:熱插拔功率分布 Evaluation Kit for the MAX5920 MAX5921 MAX5939 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
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