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參數(shù)資料
| 型號： | MAX845EUA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 外設(shè)及接口 |
| 英文描述： | Isolated Transformer Driver for PCMCIA Applications |
| 中文描述： | 1 A BUF OR INV BASED PRPHL DRVR, PDSO8 |
| 封裝： | UMAX-8 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 213K |
| 代理商： | MAX845EUA |
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. J ust select one with the desired output volt-
age and current capability, and connect it.
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 Capac itor
Ceramic capacitors can be used as output capacitors
because of the lower level of output ripple current. In
applications where output ripple is not critical, a 0.33μF
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 Capac itor
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.
M
Isolated Transformer Driver
for PCMCIA Applic ations
14
______________________________________________________________________________________
R
S
SIMPLE SHUNT ZENER
R
S
TL431
22k
22k
PROGRAMMABLE-IC SHUNT REGULATOR (STAND ALONE)
PROGRAMMABLE-IC SHUNT REGULATOR WITH DISCRETE PNP
R
S
TL431
22k
22k
1k
2N2907
5V OUTPUT
5V OUTPUT
Figure 12. Shunt-Regulator Circuits
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX845EUA+ | 功能描述:功率驅(qū)動器IC Isolated Transformer Driver for PCMCIA RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 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 |
| MAX845EUA+T | 功能描述:功率驅(qū)動器IC Isolated Transformer Driver for PCMCIA RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 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 |
| MAX845EUA-LF | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX845EUA-T | 功能描述:功率驅(qū)動器IC RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 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 |
| MAX845EVKIT-MM | 功能描述:功率驅(qū)動器IC Evaluation Kit for the MAX845 RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 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 |
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