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參數(shù)資料
| 型號： | MAX5929 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Low-Voltage. Quad. Hot-Swap Controllers/Power Sequencers |
| 中文描述： | 低電壓、四路、熱插拔控制器/供電排序器 |
| 文件頁數(shù)： | 7/11頁 |
| 文件大小： | 266K |
| 代理商： | MAX5929 |
M
-100V SOT23 Simple Swapper Hot-Swap
Controllers
_______________________________________________________________________________________
7
Turn-On and Turn-Off Delays
After power is applied, or ON/
OFF
is released, there is
a 300ms delay (t
ON
) before the gate ramp is started.
This delay is also the automatic restart time delay.
In the event of a circuit breaker condition or an over-
temperature fault condition, the turn-off delay is less
than 2μs. An undervoltage condition must exist for at
least 20ms (t
OFF
) before the MAX5900/MAX5901 turn
off the external MOSFET. ON/
OFF
must be held low for
at least 20ms (t
OFF
) before the MAX5900/MAX5901 turn
off the external MOSFET. Turn-off delay minimizes spu-
rious shutdowns due to noisy signals or momentary
voltage spikes, as well as preventing accidental reset-
ting of the circuit breaker latch (MAX5900L/MAX5901L).
Thermal Shutdown
A thermal shutdown feature helps protect the external
MOSFET. If the die temperature of the MAX5900/
MAX5901 exceeds +125
°
C, the MOSFET is turned off.
For accurate performance the MAX5900/MAX5901
must be in close thermal contact with the external MOS-
FET. See
Layout Guidelines
for information. Due to the
low power dissipation of the MAX5900/MAX5901, the
junction temperature will typically be within a few
degrees of the MOSFET. All versions of the MAX5900/
MAX5901 automatically restart from a temperature fault
when the junction temperature drops below +110
°
C.
Undervoltage Lockout
The MAX5900/MAX5901 turn off the external MOSFET if
the magnitude of the input voltage is below the level set
by ON/
OFF
for longer than 20ms (t
OFF
). If ON/
OFF
is
left unconnected, the lockout voltage (V
UVLO
) defaults
to -31.5V. V
UVLO
may also be set to any value within
the power-supply range by using external resistors. To
set the lockout voltage to a value between -9V and
-100V use a resistor-divider connected between GND
and V
EE
, with the center node of the divider connected
to ON/
OFF
. For example, use a 3k
resistor (R1 in
Figure 2) from ON/
OFF
to V
EE
and calculate the other
resistor, R2, using:
where V
UVLO
is the desired lockout voltage, and
V
ON/
OFF
is the ON/
OFF
reference threshold specified in
the
Electrical Characteristics
table (typically 1.26V).
Figure 2 shows an example circuit with V
UVLO
set for
-20V. To defeat the UVLO simply connect a single
100k
resistor between ON/
OFF
and GND, as shown in
Figure 4.
R
R
V
UVLO
1 26
.
2
1
1
|
|
=
×
Figure 3. Power-Supply Sequencing
HOT-SWAP CONTROLLER #1
V
EE
GND
C
2C
MAX5900
MAX5901
GND
ON/OFF
HOT-SWAP CONTROLLER #2
V
EE
V
EE
GND
MAX5900
MAX5901
ON/OFF
HOT-SWAP CONTROLLER
OPTIONAL
ON/OFF
-48V
V
EE
GND
R2
47k
R1
3k
MAX5900
MAX5901
GND
DGND
ON/OFF
Figure 2. Programmed -20V Lockout, with Optional Optocoupler
On/Off Control
HOT-SWAP CONTROLLER
-48V
V
EE
GND
100k
MAX5900
MAX5901
GND
ON/OFF
Figure 4. Defeating Undervoltage Lockout
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5929AEEG+ | 功能描述:熱插拔功率分布 Quad 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5929AEEG+T | 功能描述:熱插拔功率分布 Quad 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5929AHEEG | 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5929AHEEG+ | 功能描述:熱插拔功率分布 Integrated Circuits (ICs) 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5929AHEEG+T | 功能描述:熱插拔功率分布 Integrated Circuits (ICs) 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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