參數(shù)資料
型號： MAX5911
廠商： Maxim Integrated Products, Inc.
元件分類： 基準電壓源/電流源
英文描述： -48V Simple Swapper Hot-Swap Switches
中文描述： -48V、Simple Swapper熱插拔開關
文件頁數(shù)： 6/8頁
文件大?。?/td> 417K
代理商： MAX5911
M
-48V Simple Swapper Hot-Swap Switches
6
_______________________________________________________________________________________
Detailed Description
Figure 1 shows a functional block diagram. The
MAX5911/MAX5912 are hot-swap switches for negative
supply rails. The devices allow the safe insertion and
removal of circuit cards into live backplanes or ports
without causing undue glitches on the negative power-
supply rail. They operate over the -16V to -65V voltage
range. The devices act as a current regulator, using
their on-board FET to limit the amount of current drawn
from the backplane to 280mA for MAX5911 and 415mA
for MAX5912. If the load current exceeds that current
limit, the internal switch behaves like a constant current
source.
The MAX5911/MAX5912 monitor the input voltage, the
output voltage, the output current, and the die tempera-
ture. They assert their
FAULT
output if they detect an
error condition.
A zero-current load disconnect feature activates if the
load current drops below 8mA for over 350ms. They also
include an enable input that responds to positive logic,
allowing the host system to turn the FET switch on or off.
The enable input is also used to reset the devices after
an error condition has latched the output FET off.
Normal Operation
Startup
When power is first applied with ENABLE high, or when
ENABLE is asserted, the MAX5911/MAX5912 limit the
current to the load to 280mA/415mA. If the output volt-
age has not reached the power-good threshold within
the 14ms power-good delay,
FAULT
is pulled low.
FAULT
stays low until the output voltage exceeds the
power-good threshold, at which time it is released and
becomes high impedance.
Undervoltage Lockout Fault
If
V
IN
≤
UVLO
, where UVLO is the desired voltage
at which the UVLO fault occurs,
FAULT
is pulled low
and the internal FET is turned off. If the condition per-
sists for over 350ms (IF
DEL
), the FET is latched off. The
default UVLO voltage is -28V, but it can be adjusted
using an external resistive divider (see the
Changing
the Undervoltage Lockout Setting
section). Once the
FET is latched off, ENABLE must be pulsed low then
brought back high to release
FAULT
and enable V
OUT
.
Thermal Shutdown Fault
The MAX5911/MAX5912 monitor their internal die tem-
peratures. If the temperature of the die exceeds
+140
°
C,
FAULT
is pulled low and the internal FET is
latched off. ENABLE must be pulsed low and then
brought high again to reset the FET latch, and release
FAULT
, provided the die is below the thermal shutdown
temperature by 5
°
C (typ).
Power-Not-Good Fault
If |V
IN
- V
OUT
| is more than the power-good threshold
for over 14ms,
FAULT
is pulled low. When the output
voltage exceeds the power-good threshold,
FAULT
is
released.
FAULT
output is not latched during a power-
not-good fault.
Zero-Current Detection
If the load current drops below 8mA for over 350ms,
FAULT
is pulled low and the FET is latched off. ENABLE
must be pulsed low and then brought high again to
release
FAULT
and enable V
OUT
.
Applications Information
Chosing A Device
The MAX5911 will output up to 280mA (typ) and the
MAX5912 up to 415mA (typ). In applications where
high heat is expected, use the MAX5912 for its superior
UVLO
AGND
ENABLE
V
IN
FAULT
DGND
LEVEL
SHIFTER
CONTROL
LOGIC
2.11M
99.5k
+1.258V
REF
V
OUT
MAX5911/MAX5912
GATE
|V
IN
|
V
PG
(min) = 1.8V
V
PG
|V
- V
OUT
|,
V
PG
(typ) = 2V
V
PG
(max) = 2.2V
|V
OUT
|
0
POWER GOOD
POWER-NOT-GOOD DELAY
POWER-GOOD
HYSTERESIS
(5% OF V
PG
)
Figure 1. Functional Block Diagram
相關PDF資料
PDF描述
MAX5911ESA -48V Simple Swapper Hot-Swap Switches
MAX5912ESE -48V Simple Swapper Hot-Swap Switches
MAX5913 +48V Quad Hot-Swap Controllers For Power-Over-LAN
MAX5913EMH +48V Quad Hot-Swap Controllers For Power-Over-LAN
MAX5914EMH +48V Quad Hot-Swap Controllers For Power-Over-LAN
相關代理商/技術參數(shù)
參數(shù)描述
MAX5911ESA 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
MAX5911ESA+ 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
MAX5911ESA+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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
MAX5911ESA-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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
MAX5911EVKIT# 制造商:Maxim Integrated Products 功能描述:MAX5911EVKIT# 制造商:Maxim Integrated Products 功能描述:Power Management IC Development Tools MAX5911EVKIT#
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