參數(shù)資料
型號(hào)： MAX5938LEEE+
廠商： Maxim Integrated
文件頁(yè)數(shù)： 19/26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
Since the minimum intended V
IN
for the application will
result in the lowest I
TEST
during the load-probe test, this
V
IN,MIN
should be used to set the R
LP
. This voltage will
likely be near V
ON,FALLING
or V
OFF
for the application.
R
TEST
(&) = V
IN,MIN
/ I
TEST
= V
IN,MIN
x 90ms /
(C
LOAD(MAX)
x 220mV)
Example: V
IN
operating range = 36V to 72V, C
LOAD
=
10,000礔. First, find the R
LP
that will guarantee a suc-
cessful test of the load.
R
LP
= 36V x 90ms / (10,000礔 x 220mV) = 1.472& ?/DIV>
1.47k& ?%
Next, evaluate the R
LP
at the maximum operating volt-
age to verify that it will not exceed the 1A current limit
for the load-probe test.
I
TEST,MAX
= V
IN,MAX
/ R
LP
= 72V / 1.47k& = 49.0mA
If the C
LOAD(MAX)
is increased to 190,000礔, the test
current will approach the limit. In this case, R
LP
will be
a much lower value and must include the internal
switch resistance. To find the external series resistor
value that will guarantee a successful test at the lowest
supply voltage, the maximum value for the load-probe
switch on-resistance of 11& should be used:
R
LP,TOT
= 36V x 90ms / (190,000礔 x 220mV) =
90& = 11& + R
LP
R
LP
= 77.51& - 11& = 66.51& ?66.5& ?%
Again R
LP
must be evaluated at the maximum operat-
ing voltage to verify that it will not exceed the 1A cur-
rent limit for the load-probe test. In this case, the
minimum value for the load-probe switch on-resistance
of 6& should be used:
I
TEST,MAX
= V
IN,MAX
/ R
LP,TOT
= 72V / (66.5& + 6&) =
993mA
Adjusting the V
OUT
Slew Rate
The default slew rate is set internally for 9V/ms. The slew
rate can be reduced by placing an external capacitor
from the drain of the power MOSFET to the GATE output
of the MAX5938. Figure 18 shows a graph of Slew Rate
vs. C
SLEW
. This graph shows that for C
SLEW
< 4700pF
there is very little effect to the addition of external slew-
rate control capacitance. This is intended so the GATE
output can drive large MOSFETs with significant gate
capacitance and still achieve the default slew rate. To
select a slew-rate control capacitor, go into the graph
with the desired slew rate and find the value of the Miller
Capacitance. When C
SLEW
> 4700pF, SR and C
SLEW
are inversely related. Given the desired slew rate, the
required C
SLEW
is found as follows:
C
SLEW
(nF) = 23 / SR (V/ms)
From the data sheet of the power MOSFET find the
reverse transfer capacitance (gate-to-drain capacitance)
above 10V. If the reverse transfer capacitance of the
external power MOSFET is 5% or more of C
SLEW
, then it
should be subtracted from C
SLEW
in the equation above.
Figure 19 gives an example of the external circuit for con-
trolling slew rate. Depending on the parasitics associated
with the selected power MOSFET, the addition of C
SLEW
may lead to oscillation while the MOSFET and GATE con-
-48V Hot-Swap Controller with V
IN
Step Immunity,
No R
SENSE
, and Overvoltage Protection
______________________________________________________________________________________   19
Figure 18. MAX5938 Slew Rate vs. C
SLEW
SLEW RATE vs. C
SLEW
C
SLEW
 (nF)
100
10
1
0.1
1
10
0.01
0.1
1000
Figure 19. Adjusting the MAX5938 Slew Rate
MAX5938
V
OUT
C
LOAD
LOAD
GATE
V
EE
GND
C
SLEW
R
GATE
-48V
GND
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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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