參數(shù)資料
型號(hào)： MAX6499
廠商： Maxim Integrated Products, Inc.
英文描述： 72V, Overvoltage-Protection Switches/Limiter Controllers with an External MOSFET
中文描述： 72V、過壓保護(hù)開關(guān)/限幅控制器，外置MOSFET
文件頁數(shù)： 11/16頁
文件大小： 359K
代理商： MAX6499
During
t
2
, C
OUT
loses charge through the output load.
The voltage across C
OUT
(
V
2
) decreases until the
MOSFET reaches its V
GS(TH)
threshold and can be
approximated using the following formula:
Once the MOSFET V
GS(TH)
is obtained, the slope of the
output-voltage rise is determined by the MOSFET Q
g
charge through the internal charge pump with respect
to the drain potential. The new rise time needed to
reach a new overvoltage event can be calculated using
the following formula:
where Q
GD
is the gate-to-drain charge.
The total period of the overvoltage waveform can be
summed up as follows:
t
OV =
t
1
+
t
2
+
t
3
The MAX6495/MAX6496/MAX6499 dissipate the most
power during an overvoltage event when I
OUT
= 0. The
maximum power dissipation can be approximated
using the following equation:
The die-temperature increase is related to
θ
JC
(8.3°C/W
and 8.5°C/W for the MAX6495/MAX6496/MAX6499,
respectively) of the package when mounted correctly
with a strong thermal contact to the circuit board. The
MAX6495/MAX6496/MAX6499 thermal shutdown is
governed by the equation:
T
J
= T
A
+ P
DISS
x
θ
JC
< +170°C
P
V
I
t
t
DISS
OV
GATEPD
OV
0 975
×
×
=
1
I
t
Q
V
V
GD
GS
OUT
GATE
3
V
I
t
C
OUT
OUT
2
2
=
M
72V, Overvoltage-Protection Switches/Limiter
Controllers with an External MOSFET
______________________________________________________________________________________
11
OVSET
GND
GATE
IN
SHDN
OUTFB
12V IN
MAX6495
DC-DC
CONVERTER
IN
GND
OUT
Figure 5. Overvoltage Limiter (MAX6495)
OVSET
GND
GATE
IN
SHDN
GATEP
OUTFB
12V
MAX6496
DC-DC
CONVERTER
IN
GND
OUT
Figure 6. Overvoltage Limiter with Low-Voltage-Drop Reverse-
Protection Circuit (MAX6496)
Typical Application Circuits
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PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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MAX6499ATA/V+T 制造商:Maxim Integrated Products 功能描述:72V, OVERVOLTAGE-PROTECTION SWITCHES/LIMITER CONTROLLERS WIT - Tape and Reel
MAX6499ATA+ 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:OVERVOLT PROT CNTRLR 8TDFN EP - Rail/Tube
MAX6499ATA+T 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 72V Over V Protect Switch/Limiter RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel
MAX649C/D 功能描述:DC/DC 開關(guān)控制器 5V/3.3V/3V or Adjustable High-Efficiency Low-IQ Step-Down DC-DC Controllers RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
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