- 您现在的位置：买卖IC网 > PDF目录13137 > MAX845ESA+ (Maxim Integrated Products)IC DRVR XFRMR CMOS PCMCIA 8SOIC PDF资料下载
参数资料
| 型号： | MAX845ESA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC DRVR XFRMR CMOS PCMCIA 8SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 应用： | 变压器驱动器，PCMCIA |
| 输入电压： | 3.3V，5V |
| 输出数： | 1 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
| 产品目录页面： | 1409 (CN2011-ZH PDF) |
Isolated Transformer Driver
for PCMCIA Applications
R S
SIMPLE SHUNT ZENER
R S
22k
TL431
22k
PROGRAMMABLE-IC SHUNT REGULATOR (STAND ALONE)
R S
1k
5V OUTPUT
The simplest voltage regulator is the shunt zener shown
in Figure 12. The series resistor (R S ) value should be as
high as possible to still deliver the maximum expected
load current with minimum input voltage. Be sure that no
ratings are exceeded at maximum input voltage and
minimum load current conditions; under such conditions,
the zener diode may have to dissipate much more power
than the load. Alternatively, start with the maximum allow-
able zener dissipation and select the series resistor
under light-load, high-line conditions. Then verify that
there is sufficient output current available with worst-
case low input voltage.
For better regulation than the simple shunt zener, con-
sider a shunt regulator IC such as the TL431. This
device behaves like a zener diode whose voltage can
be programmed by a resistor ratio. It can be used as a
stand-alone device or can be boosted above its 150mA
maximum rating without compromising its accuracy by
adding a discrete PNP transistor, as shown in Figure 12.
The input power of a shunt regulator is nearly indepen-
dent of load, so efficiency at light loads tends to be
worse than it would be with a series regulator.
Output Filter Capacitor
Ceramic capacitors can be used as output capacitors
22k
2N2907
because of the lower level of output ripple current. In
applications where output ripple is not critical, a 0.33μF
5V OUTPUT
TL431
22k
PROGRAMMABLE-IC SHUNT REGULATOR WITH DISCRETE PNP
Figure 12. Shunt-Regulator Circuits
Output Regulator
Since the output voltage is not regulated against
changes in the input voltage or load current, an output
voltage regulator may be needed. A series linear regu-
lator gives good performance and reasonably good
efficiency at low cost. A shunt regulator costs less,
occupies less space, and gives adequate performance
for some applications.
Series regulators such as the MAX666, MAX667,
MAX882/MAX883/MAX884, or MAX603/MAX604 simpli-
fy designs. Just select one with the desired output volt-
age and current capability, and connect it.
chip or ceramic capacitor is normally sufficient. Refer to
Table 3 for suggested capacitor suppliers.
In applications sensitive to output-ripple noise, the out-
put filter capacitor (C2) should have a low equivalent
series resistance (ESR) and a low equivalent series
inductance (ESL), and its capacitance should remain
fairly constant over temperature.
Sprague 595D surface-mount solid tantalum capacitors
and Sanyo OS-CON through-hole capacitors are recom-
mended, if space allows, due to their extremely low ESR.
Capacitor ESR usually rises at low temperatures, but OS-
CON capacitors provide very low ESR below 0°C.
Input Bypass Capacitor
The input bypass capacitor (C1) is not critical. Unlike
switching regulators, the MAX845’s supply current is
fairly constant, and is therefore less dependent on the
input bypass capacitor. A low-cost 0.33μF chip or
ceramic capacitor is normally sufficient for input
bypassing.
14
______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| ADP1753ACPZ-R7 | IC REG LDO ADJ .8A 16LFCSP |
| RSC26DRTH-S93 | CONN EDGECARD 52POS DIP .100 SLD |
| GBM40DCCS | CONN EDGECARD 80POS R/A .156 SLD |
| VE-B2W-EY-F3 | CONVERTER MOD DC/DC 5.5V 50W |
| ACE15DHHD | CONN EDGECARD 30POS 1MM DIP SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX845ESA/GH9 | 功能描述:功率驱动器IC RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MAX845ESA/GH9-T | 功能描述:功率驱动器IC RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MAX845ESA+ | 功能描述:功率驱动器IC Isolated Transformer Driver for PCMCIA RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MAX845ESA+T | 功能描述:功率驱动器IC Isolated Transformer Driver for PCMCIA RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MAX845ESA-T | 功能描述:功率驱动器IC RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
发布紧急采购，3分钟左右您将得到回复。