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參數(shù)資料
| 型號： | MAX5919LEEE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Low-Voltage, Dual Hot-Swap Controllers with Independent ON/OFF Control |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封裝： | 0.150 INCH, QSOP-16 |
| 文件頁數(shù)： | 12/15頁 |
| 文件大小： | 443K |
| 代理商： | MAX5919LEEE |
M
C
BOARD
= 6μF and the load does not draw any current
during the startup period. With no gate capacitor the
inrush current, charge, and discharge times are:
μ
+
μ
0 10 4
3
With a 22nF gate capacitor the inrush current, charge,
and discharge times are:
Case B: Fast Turn-On (with current limit)
In applications where the board capacitance (C
BOARD
)
is high, the inrush current causes a voltage drop across
R
SENSE
that exceeds the startup fast-comparator
threshold. The fast comparator regulates the voltage
across the sense resistor to V
SU,TH
. This effectively
regulates the inrush current during startup. In this case,
the current charging C
BOARD
can be considered con-
stant and the turn-on time is:
The maximum inrush current in this case is:
Figure 2 shows the waveforms and timing diagrams for
a startup transient with current regulation (see
Typical
Operating Characteristics
)
.
When operating under
this condition, an external gate capacitor is not
required.
ON Comparators
The ON comparators control the on/off function of the
MAX5918/MAX5919. ON_ allows independent control
over channel 1 and channel 2. Drive ON1 and ON2
high (> 0.875V) to enable channel 1 and channel 2,
respectively. Pull ON_ low (< 0.875V) to disable the
respective channel.
Using the MAX5918/MAX5919 on the
Backplane
Using the MAX5918/MAX5919 on the backplane allows
multiple cards with different input capacitance to be
inserted into the same slot even if the card does not
have on-board hot-swap protection. The startup period
can be triggered if IN is connected to ON through a
trace on the card (Figure 5).
Input Transients
The voltage at IN1 or IN2 must be above the UVLO dur-
ing inrush and fault conditions. When a short-circuit
condition occurs on the board, the fast comparator
trips causing the external MOSFET gates to be dis-
charged at 3mA. The main system power supply must
be able to sustain a temporary fault current, without
dropping below the UVLO threshold of 2.4V, until the
external MOSFET is completely off. If the main system
power supply collapses below UVLO, the MAX5918/
MAX5919 force the device to restart once the supply
has recovered. The MOSFET is turned off in a very
short time resulting in a high di/dt. The backplane deliv-
ering the power to the external card must have low
inductance to minimize voltage transients caused by
this high di/dt.
MOSFET Thermal Considerations
During normal operation, the external MOSFETs dissi-
pate little power. The MOSFET R
DS(ON)
is low when the
MOSFET is fully enhanced. The power dissipated in
normal operation is P
D
= I
LOAD
2
x R
DS(ON)
. The most
power dissipation occurs during the turn-on and turn-
off transients when the MOSFETs are in their linear
regions. Take into consideration the worst-case sce-
nario of a continuous short-circuit fault, consider these
two cases:
1) The single turn-on with the device latched after a
fault (MAX5918L/MAX5919L)
2) The continuous automatic retry after a fault
(MAX5918A/MAX5919A)
MOSFET manufacturers typically include the package
thermal resistance from junction to ambient (R
θ
JA
) and
thermal resistance from junction to case (R
θ
JC
), which
determine the startup time and the retry duty cycle
(d = t
START
/t
START
+ t
RETRY
). Calculate the required
transient thermal resistance with the following equation:
where I
START
= V
SU,TH
/ R
SENSE
Z
T
V
T
I
JA MAX
θ
(
JMAX
IN
×
A
START
)
≤
I
V
R
INRUSH
SUTH
,
SENSE
=
t
V
R
V
ON
BOARD
IN
,
SENSE
SUTH
=
×
×
I
F
+
×
pF
nF
nF
.
A
mA
t
V
A
μ
10 4
3
nC
ms
t
nF
V
nC
mA
ms
INRUSH
CHARGE
DISCHARGE
=
μ
×
μ +
=
=
+
=
=
×
+
=
6
600
22
22
10 4
100
100
0
26 5
60
2 89
.
22
60
0 096
.
.
.
I
F
pF
A
A
t
V
nC
A
ms
t
V
mA
nC
ms
INRUSH
CHARGE
DISCHARGE
=
×
μ +
=
+
=
=
+
=
6
600
0 10 4
0
100
0 1
60
100
0 6
.
60
0 02
.
.
.
Low-Voltage, Dual Hot-Swap Controllers with
Independent ON/OFF Control
12
______________________________________________________________________________________
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5919LEEE+ | 制造商:Maxim Integrated Products 功能描述:HOT SWAP CNTRLR 16QSOP - Rail/Tube |
| MAX5920AESA | 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 |
| MAX5920AESA+ | 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 |
| MAX5920AESA+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 |
| MAX5920AESA-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 |
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