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參數(shù)資料
| 型號(hào)： | MAX5921AESA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Quadruple 2-Line To 1-Line Data Selectors/Multiplexers 20-LCCC -55 to 125 |
| 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)： | 11/18頁 |
| 文件大小： | 313K |
| 代理商： | MAX5921AESA |
M
-48V Hot-Swap Controllers with External
R
SENSE
and High Gate Pulldown Current
______________________________________________________________________________________
11
Figure 10 shows how to program the undervoltage and
overvoltage trip thresholds using three resistors. With R4
= 549k
, R5 = 6.49k
, and R6 = 10k
, the undervolt-
age threshold is set to 38.5V (with a 43V release from
undervoltage), and the overvoltage is set to 71V. The
resistor-divider also increases the hysteresis and over-
voltage lockout to 4.5V and 2.8V at the input supply,
respectively.
PWRGD
/PWRGD Output
Use the
PWRGD
(PWRGD) output to enable a power
module after hot insertion. Use the MAX59__A (
PWRGD
)
to enable modules with an active-low enable input
(Figure 12), or use the MAX59__B (PWRGD) to enable
modules with an active-high enable input (Figure 11).
The PWRGD signal is referenced to the DRAIN termi-
nal, which is the negative supply of the power module.
The
PWRGD
signal is referenced to V
EE
.
When the DRAIN voltage of the MAX5921A (see
Selector Guide
for complete selection) or MAX5939A is
high with respect to V
EE
or the GATE voltage is low
from an undervoltage condition, then the internal pull-
down MOSFET Q2 is off. The
PWRGD
output goes into
a high-impedance state (Figure 13).
PWRGD
is pulled
high by the module
’
s internal pullup current source,
turning the module off. When the DRAIN voltage drops
below V
DL
and the GATE voltage is greater than
V
GATE
- V
GH
, Q2 turns on and
PWRGD
pulls low,
enabling the module.
The
PWRGD
signal can also be used to turn on an LED
or optoisolator to indicate that the power is good (Figure
13) (see the
Component Selection Procedure
section).
When the DRAIN voltage drops below V
DL
and the
GATE voltage is greater than
V
GATE
- V
GH
, MOSFET
Q3 turns on, shorting I
1
to V
EE
and turning Q2 off. The
pullup current in the module pulls the PWRGD high,
enabling the module.
When the DRAIN voltage of the MAX5921B/MAX5939B
(see
Selector Guide
for complete selection) is high with
respect to V
EE
(Figure 12) or the GATE voltage is low
due to an undervoltage condition, the internal MOSFET
Q3 is turned off so that I
1
and the internal MOSFET Q2
clamp PWRGD to the DRAIN turning off the module.
Once the PWRGD and
PWRGD
outputs are active, the
MAX5921/MAX5939 output does not toggle due to an
overvoltage (OV) fault.
GATE Voltage Regulation
GATE goes high when the following startup conditions
are met: UV is high, OV is low, the supply voltage is
above V
UVLOH
, and (V
SENSE
- V
EE
) is less than 50mV.
The gate is pulled up with a 45μA current source and is
regulated at 13.5V above V
EE
. The MAX5921/MAX5939
include an internal clamp that ensures the GATE voltage
of the external MOSFET never exceeds 18V. During a
fast-rising V
DD
, an additional dynamic clamp keeps the
GATE and SENSE potentials as close as possible to pre-
vent the FET from accidentally turning on. When a fault
condition is detected, GATE is pulled low (see the
Load
Current Regulation
section).
GATE - V
EE
10V/div
DRAIN
50V/div
INRUSH
CURRENT
5A/div
1ms/div
Figure 7. Short-Circuit Protection Waveform
DRAIN
20V/div
V
20V/div
I
D
(Q1)
2A/div
400
μ
s/div
Figure 8. Voltage Step-On Input Supply
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PDF描述 |
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| MAX5921BESA | Quadruple 2-Line To 1-Line Data Selectors/Multiplexers 16-CDIP -55 to 125 |
| MAX5921EESA | Quadruple 2-Line To 1-Line Data Selectors/Multiplexers 16-CFP -55 to 125 |
| MAX5939AESA | Quadruple 2-Input Positive-OR Gates 20-LCCC -55 to 125 |
| MAX5939EESA | Quadruple 2-Input Positive-OR Gates 14-CDIP -55 to 125 |
| MAX5939BESA | -48V Hot-Swap Controllers with External RSENSE and High Gate Pulldown Current |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| MAX5921BESA | 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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