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參數(shù)資料
| 型號： | MAX5949AESA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | -48V Hot-Swap Controllers with External RSENSE |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 0.150 INCH, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 9/18頁 |
| 文件大?。?/td> | 269K |
| 代理商： | MAX5949AESA |
Board Insertion
Figure 7a shows a typical hot-swap circuit for -48V sys-
tems. When the circuit board first makes contact with
the backplane, the DRAIN to GATE capacitance (C
gd
)
of Q1 pulls up the GATE voltage to roughly IV
EE
x C
gd
/
(C
gd
+ C
gs
)I. The MAX5949_ features an internal
dynamic clamp between GATE and V
EE
to keep the
gate-to-source voltage of Q1 low during hot insertion,
preventing Q1 from passing an uncontrolled current to
the load. For most applications, the internal dynamic
clamp between GATE and V
EE
of the MAX5949A/
MAX5949B eliminates the need for an external gate-to-
source capacitor C1. Resistor R3 limits the current into
the clamp circuitry during card insertion.
Power-Supply Ramping
The MAX5949_ can reside either on the backplane or
the removable circuit board (Figure 7a). Power is deliv-
ered to the load by placing an external n-channel
MOSFET pass transistor in the power-supply path.
After the circuit board is inserted into the backplane
and the supply voltage at V
EE
is stable and within the
undervoltage and overvoltage tolerance, the MAX5949_
turn on Q1. The MAX5949_ gradually turn on the exter-
nal MOSFET by charging the gate of Q1 with a 45μA
current source.
Capacitor C2 provides a feedback signal to accurately
limit the inrush current. The value of C
2
can be
calculated:
where C
L
is the total load capacitance, C3 + C4, and
I
PU
is the MAX5949_ gate pullup current.
Figure 7b shows the inrush current waveform. The cur-
rent through C2 controls the GATE voltage. At the end
of the DRAIN ramp, the GATE voltage is charged to its
final value. The GATE-to-SENSE clamp limits the maxi-
mum V
GS
to about 18V under any condition.
Board Removal
If the card is removed from a live backplane, the output
capacitor on the card may not be immediately dis-
charged. While the output capacitor is discharging, the
MAX5949_ continues to operate as if the input supply
were still connected because the output capacitor tem-
porarily supplies operating current to the IC. If the cir-
cuit is connected as in Figure 7a, the voltage at the UV
pin falls below the V
UVL
, and the MAX5949_ turns off
the external MOSFET. If R4 in the circuit is connected
directly to the -48V return, the external MOSFET
remains on until the capacitor is discharged sufficiently
to drop the UV pin voltage to V
UVL
.
C
I
x C
I
PU
INRUSH
L
2
=
M
-48V Hot-Swap Controllers
with External R
SENSE
_______________________________________________________________________________________
9
V
EE
SENSE
GATE
DRAIN
V
DD
OV
UV
PWRGD
MAX5949B
-48V RTN
-48V
R4
549k
1%
R5
6.49k
1%
R6
10k
1%
R1
0.02
5%
R3
1k
5%
R2
10
5%
C1**
470nF
25V
Q1
IRF530
C2
15nF
100V
GATE IN
V
IN+
VICOR
VI-J3D-CY
V
IN-
C4
100
μ
F
100V
C3
0.1
μ
F
100V
C5
100
μ
F
10V
*
10nF
-48V RTN
(SHORT PIN)
*DIODES INC. SMAT70A.
**OPTIONAL.
Figure 7a. Inrush Control Circuitry
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| MAX5949BESA | 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 |
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