- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385552 > MAX845 (Maxim Integrated Products, Inc.) Isolated Transformer Driver for PCMCIA Applications(750mW,隔離變壓器驅(qū)動(dòng)器) PDF資料下載
參數(shù)資料
| 型號(hào)： | MAX845 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Isolated Transformer Driver for PCMCIA Applications(750mW,隔離變壓器驅(qū)動(dòng)器) |
| 中文描述： | 隔離型、變壓器驅(qū)動(dòng)器，適用于PCMCIA設(shè)計(jì) |
| 文件頁(yè)數(shù)： | 7/16頁(yè) |
| 文件大?。?/td> | 230K |
| 代理商： | MAX845 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)當(dāng)前第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)
Isolated Data Conversion
Almost any serial-interface device is a candidate for
operation across an isolation barrier; Figure 6 illustrates
one example. The MAX176 analog-to-digital converter
(ADC) operates from +5V and -12V supplies, provided
by the multiple-tapped secondary and linear regulators.
This circuit easily supplies several hundred milliwatts of
additional isolated power for signal conditioning, multi-
plexing, or sensors. A +12V supply can be generated
by adding two more diodes from the ends of the sec-
ondary, and a -5V supply can be generated by con-
necting additional diodes to the
1
4
and
3
4
tap points on
the secondary. The MAX845 supplies sufficient power
for almost any Maxim ADC.
T elephone-S ubsc riber-Line Power S upply
The standard telephone system is placed in the “off
hook” state by placing a load on the line to signal the
central office that service is requested. Normally, most of
this power is wasted in a load resistor, but some systems
can benefit from utilizing this free power. Figure 7 shows
one way to transform the wasted telephone power to an
isolated, regulated 5V at currents up to 50mA.
Because the telephone line is a high-impedance
source, there can be a start-up problem with any DC-
to-DC converter; when the line voltage is low during
start-up, the frequency can be too low for the trans-
former, causing it to saturate. This excess saturation
current can keep the voltage from climbing to normal
operating levels. Thus the purpose of Q1, Q2, and the
associated resistors is to ensure that the MAX845
remains in the shutdown mode until the voltage is high
enough to allow proper operation.
Isolated 4mA to 20mA Analog Interfac e
The 4mA to 20mA current loop is widely used in the
process-control industry for transducer and actuator
control signals. These signals are commonly referred to
a distant ground that may be at a considerably higher
voltage with respect to the local ground. The circuit in
Figure 8 generates an isolated 4mA to 20mA current
from a 5V supply.
Isolated RS -485 Data Interfac e
The MAX845 power-supply transformer driver also pro-
vides isolated power for RS-485 data-interface applica-
tions. The application circuit of Figure 9 combines the
MAX845 with a low-dropout linear regulator, a trans-
former, several high-speed optocouplers, and a Maxim
RS-485 interface device.
Isolated RS -232 Data Interfac e
The MAX845 is ideal for isolated RS-232 data-interface
applications requiring more than four transceivers. Its
750mW output power capability enables it to drive 10
transceivers simultaneously. Figure 10 shows the typi-
cal application circuit for a complete 120kbps isolated
RS-232 data interface. This figure also shows how the
Sharp PC417 optocouplers can be replaced by the
lower-cost Quality Technologies 4N25 devices to
achieve data transfer rates up to 19.2kbps.
M
Isolated Transformer Driver
for PCMCIA Applic ations
_______________________________________________________________________________________
7
0.33μF
MAX845
D1
D2
FS
SD
GND1
GND2
N.C.
1
8
5
2
7
3
V
CC
6
4
MBR0520L*
5V
IN
*1N914 POSSIBLE FOR LOWER CURRENTS
0.33μF
IN
OUT
GND
78L05
-5V
100mA
HALO
TGM-030P3
N.C.
Figure 5. Low-Noise Supply
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX847EEI | 1-Cell, Step-Up Two-Way Pager System IC |
| MAX847 | Quadruple 2-Line To 1-Line Data Selectors/Multiplexers 16-CDIP -55 to 125 |
| MAX848-MAX849 | 1-Cell to 3-Cell, High-Power, Low-Noise, Step-Up DC-DC Converters |
| MAX849ESE | 1-Cell to 3-Cell, High-Power, Low-Noise, Step-Up DC-DC Converters |
| MAX848ESE | 1-Cell to 3-Cell, High-Power, Low-Noise, Step-Up DC-DC Converters |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX845C/D | 功能描述:功率驅(qū)動(dòng)器IC Isolated Transformer Driver PCMCIA RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX845C/D+ | 功能描述:功率驅(qū)動(dòng)器IC RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX845CSA | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX845ESA | 功能描述:功率驅(qū)動(dòng)器IC RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX845ESA/GH9 | 功能描述:功率驅(qū)動(dòng)器IC RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。