參數(shù)資料
型號(hào)： MAX5938LEEE+
廠商： Maxim Integrated
文件頁(yè)數(shù)： 18/26頁(yè)
文件大?。?/td> 915K
描述： IC HOT-SWAP CTRLR -48V 16-QSOP
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 100
類(lèi)型： 熱交換控制器
應(yīng)用： 通用
內(nèi)部開(kāi)關(guān)： 無(wú)
電源電壓： -10 V ~ -80 V
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 16-SSOP（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 16-QSOP
包裝： 管件
Appendix B gives a more complete analysis and dis-
cussion of the step monitor function. It provides meth-
ods for the characterization of the load response to a
V
IN
ramp and graphical verification of the step monitor
timing margins for a set of design parameters.
Selecting the PGOOD Pullup Resistor
Due to the open-drain driver, PGOOD requires an exter-
nal pullup resistor to GND. This resistor should be
selected to minimize the current load while PGOOD is
low. The PGOOD output specification for V
OL
is 0.4V at
1mA. As described in the Detailed Description, the
external pullup interferes with the ability of PGOOD to
follow positive V
IN
steps as well as if it were driven by an
active pullup. When PGOOD is asserted high, an appar-
ent negative glitch appears at PGOOD during a positive
V
IN
step. To minimize this negative transient it may be
necessary to increase the pullup current and/or to add a
small amount of capacitance from PGOOD to GND to
compensate for the pin capacitance.
Setting the Test Current Level for
Load-Probe Test
The load-probe test is a current test of the load that
avoids turning on the power MOSFET. The MAX5938
has an internal switch (Q1 in Figure 17) that pulls cur-
rent through the load and through an external current-
limiting resistor, R
LP
. During the test, this switch is
pulsed on for up to 220ms (typ). Current is pulled
through the load, which should charge up the load
capacitance unless there is a short. If the voltage
across the load exceeds 200mV, the test is truncated
and normal power-up is allowed to proceed. If the volt-
age across the load does not reach 200mV in the
220ms period that the current is on, the load is
assumed to be shorted and the current to the load from
LP is shut off. The MAX5938A will timeout for 16 x t
LP
then retry the load-probe test. The MAX5938L will latch
the fault condition indefinitely until ON and OFF are
cycled low for 1.5ms or the power is recycled.
In the application, the current-limiting resistor should be
selected to minimize the current pulled through the
load while guaranteeing that it will charge the maximum
expected load capacitance to 220mV in 90ms. These
parameters are the maximum load-probe test voltage
and the minimum load-probe current pulse period,
respectively. The maximum current possible is 1A,
which is adequate to test a load capacitance as large
as 190,000礔 over the typical telecom operating
voltage range.
I
TEST
(A) = C
LOAD,MAX
(F) x 220mV / 90ms
TIMING
LOGIC
MAX5938
C
LOAD
LOAD
LOAD
OK
V
IN
V
EE
Q1
R
ON
GATE
V
OUT
R
LP
I
TEST
I
LOAD
200mV
GND
LP
-48V Hot-Swap Controller with V
IN
Step Immunity,
No R
SENSE
, and Overvoltage Protection
18   ______________________________________________________________________________________
Figure 17. Load Probe Functional Diagram
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX5938LEEE+ 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
MAX5938LEEE+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
MAX5938LEEE-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
MAX5939AESA 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
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
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