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參數(shù)資料
| 型號： | MAX4505EUA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Fault-Protected, High-Voltage, Signal-Line Protector |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | UMAX-8 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大小： | 120K |
| 代理商： | MAX4505EUA |
Fault Protection with Power Off
When power is off (i.e., V+ = V- = 0), the protector is a
virtual open circuit. The output stays at 0 with up to
±40V applied to the input.
Fault Protection with Power On
A fault condition exists when the voltage on AIN
exceeds either supply rail. This definition is valid when
power is on or off, as well as during all states while
power ramps up or down.
Applications Information
Supplying Power Through External ICs
The MAX4505 has low supply current (<250μA), which
allows the supply pins to be driven by other active cir-
cuitry instead of connected directly to the power
sources. In this configuration, the part can be used as a
driven fault-protected switch with V+ or V- used as the
control pins. For example, with the V- pin grounded, the
output of a CMOS gate can drive the V+ pin to turn the
device on and off. Ensure that the driving source(s)
does not drive the V+ pin more negative than the V- pin.
Protector as Circuit Elements
Figure 3 shows a MAX4505 used in front of a MAX338
unprotected 1-to-8 multiplexer. With supplies at ±15V,
V
AOUT
of the MAX4505 clamps to ±15V and V
OUT
of
the MAX338 goes to ±14V. With supplies off, V
AOUT
goes to 0 even though the input remains at ±25V.
Multiplexer and Demultiplexer
The MAX4505 can be used in series with the output of a
MAX4508 (1-to-8 multiplexer) to act as multiplexer or
demultiplexer. The MAX4508 is a fault-protected multi-
plexer whose inputs are designed to interface with harsh
environments; however, its common output is not fault
protected if connected to outside signals (i.e., demulti-
plexer use). If the common output can see fault signals,
then it needs to be protected, and the MAX4505 can be
added to provide complete protection.
As seen in Figure 4, the signal input can now be put
into pin 3 of the MAX4505 (new common output for sys-
tem), and outputs can be taken at MAX4508 pins 4 to
7, and 9 to 12. This is the classic demultiplexer opera-
tion. This system now has full protection on both of the
multiplexers’ inputs and outputs.
Measuring Path Resistance
Measuring path resistance requires special techniques,
since path resistance varies dramatically with the AIN
and AOUT voltages relative to the supply voltages. Do
not use conventional ohmmeters. Their applied voltage
and currents are usually unpredictable. The true resis-
M
Fault-Protected, High-Voltage,
Signal-Line Protector
_______________________________________________________________________________________
7
MAX4505
R
OUT
V
IN
AIN
V-
V-
V+
V+
AOUT
Figure 2. Application Circuit
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
MAX338
-15V
1
2
8
7
+15V
+25V
3
4
6
5
MAX4505
A1
A2
GND
V+
NO5
NO6
NO7
NO8
A
O
EN
V-
OV
+5V
-5V
+3V
+15V
NO3
NO1
NO2
NO4
V
OUT
Figure 3. Protecting a MAX338 with a MAX4505
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
MAX4508
-15V
1
2
8
7
+15V
NEW COM
3
4
6
5
MAX4505
A1
A2
GND
V+
NO5
NO6
NO7
NO8
AO
EN
V-
O
+5V
-15V
+3V
+15V
NO3
NO1
NO2
NO4
COM
Figure 4. Demultiplexer Application Using MAX4505
with MAX4508
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4505EUA+T | 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 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 安裝風格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel |
| MAX4505EUA-T | 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 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 安裝風格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel |
| MAX4505EUK | 制造商:Maxim Integrated Products 功能描述:FAULT-PROTECTED HIGH-VOLTAGE SIGN - Rail/Tube |
| MAX4505EUK+ | 制造商:Maxim Integrated Products 功能描述:FAULT PROTECTED 5PIN SOT-23 - Rail/Tube |
| MAX4505EUK+T | 功能描述:模擬開關(guān) IC Fault-Protected Signal-Line Protectr RoHS:否 制造商:Texas Instruments 開關(guān)數(shù)量:2 開關(guān)配置:SPDT 開啟電阻（最大值）:0.1 Ohms 切換電壓（最大）: 開啟時間（最大值）: 關(guān)閉時間（最大值）: 工作電源電壓:2.7 V to 4.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-16 |
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