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參數(shù)資料
| 型號(hào)： | MAX5939AESA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Quadruple 2-Input Positive-OR Gates 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)： | 12/18頁 |
| 文件大?。?/td> | 313K |
| 代理商： | MAX5939AESA |
M
-48V Hot-Swap Controllers with External
R
SENSE
and High Gate Pulldown Current
12
______________________________________________________________________________________
Overcurrent Fault Integrator
The MAX5921/MAX5939 feature an overcurrent fault inte-
grator. When an overcurrent condition is detected, an
internal digital counter is incremented. The clock period
for the digital counter is 32μs for the 500μs maximum
current-limit duration version and 128μs for 2ms maxi-
mum current-limit duration devices. An overcurrent of
less than 32μs is interpreted as an overcurrent of 32μs.
When the counter reaches 500μs (the maximum current-
limit duration) for the MAX5921/MAX5939A, an overcur-
rent fault is generated. If the overcurrent fault does not
last 500μs, then the counter begins decrementing at a
rate 128 (maximum current-limit duty cycle) times slower
than the counter was incrementing. Repeated overcur-
rent conditions generate a fault if the duty cycle of the
overcurrent condition duty ratio is greater than the maxi-
mum current-limit duty cycle (see Figure 14).
Thermal Shutdown
The MAX5921/MAX5939 include internal die-tempera-
ture monitoring. When the die temperature reaches the
thermal-shutdown threshold, T
OT
, the MAX5921/
MAX5939 pull GATE low and turn off the external MOS-
FET. If a good thermal path is provided between the
MOSFET and the MAX5921/MAX5939, the device offers
thermal protection for the external MOSFET. Placing the
MAX5921/MAX5939 near the drain of the external MOS-
FET offers the best thermal protection because most of
the power is dissipated in its drain.
After a thermal shutdown fault has occurred, the
MAX5921_ turns the external FET off for a minimum
time of t
OFF
, allowing the MOSFET to cool down. The
MAX5921_ device restarts after the temperature drops
20
°
C below the thermal-shutdown threshold.
The MAX5939_ latches off after a thermal shutdown
fault. The MAX5939_ can be restarted by toggling UV
low or cycling power. However, the device keeps the
external FET off for a minimum time of t
OFF
when tog-
gling UV.
Applications Information
Sense Resistor
The circuit-breaker current-limit threshold is set to 50mV
(typ). 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 current plus the dynamic load-capacitance charg-
ing current during startup. Choose the sense resistor
power rating to be greater than (V
CL
)
2
/ R
SENSE
.
V
GATE
- V
EE
2V/div
I
D
(Q1)
2A/div
10ms/div
Figure 9. Automatic Restart After a Short Circuit
V
EE
V
DD
OV
UV
-48V
V
UV
= 1.255
R4 + R5 + R6
R5 + R6
R4
R5
R6
3
2
4
8
V
OV
= 1.255
R4 + R5 + R6
R6
MAX5921
MAX5939
-48V RTN
(SHORT PIN)
-48V RTN
Figure 10. Undervoltage and Overvoltage Sensing
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| MAX5939FESA | -48V Hot-Swap Controllers with External RSENSE and High Gate Pulldown Current |
| MAX5933D | Positive High-Voltage, Hot-Swap Controllers |
| MAX5933DESA | Positive High-Voltage, Hot-Swap Controllers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5939AESA+ | 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 |
| MAX5939AESA+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 |
| MAX5939AESA-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 |
| MAX5939BESA | 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 |
| MAX5939BESA+ | 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 |
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