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| 型号： | MAX256ASA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/14页 |
| 文件大小： | 0K |
| 描述： | IC DVR H-BRIDGE 3W 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 类型： | 半桥 |
| 输入类型： | 非反相 |
| 输出数： | 2 |
| 导通状态电阻： | 500 毫欧 |
| 电流 - 输出 / 通道： | 600mA |
| 电流 - 峰值输出： | 1A |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm Width）裸露焊盘 |
| 供应商设备封装： | 8-SOICN 裸露焊盘 |
| 包装： | 管件 |
| 产品目录页面： | 1401 (CN2011-ZH PDF) |
3W Primary-Side Transformer H-Bridge Driver
for Isolated Supplies
from ST1 and ST2 by placing a grounded trace between
these circuits. Place R S as close as possible to the
CK_RS pin. An additional capacitance of 100nF from
CK_RS to GND may be required in some applications.
Output Voltage Regulation
For many applications, the unregulated output of the
MAX256 meets the supply voltage tolerances. This con-
figuration represents the highest efficiency possible
with the MAX256.
For applications requiring a regulated output voltage,
Maxim provides several solutions. In the following
examples, assume a tolerance of ±10% variation for the
input voltage.
When a full-bridge power supply is operated under
maximum input voltage and low output load current, the
voltage at the output of the rectifier network can exceed
the absolute maximum input voltage of the low dropout
regulator (LDO). If the minimum output load current is
less than approximately 5mA, connect a zener diode
from the output voltage to ground (as shown in Figure
2) to limit the output to a safe value.
+3.3V to Isolated, Regulated +5.0V
In the circuit of Figure 2, the MAX1659 LDO regulates
the output of the MAX256 to +5V. The Halo TGM-
H281NF provides a center-tapped 1:2.6 turns ratio, and
the secondary circuit implements a 4-diode bridge rec-
tifier (Figure 1C).
For a minimum input voltage of +3.0V, the output volt-
age of the bridge rectifier is approximately +5.5V at a
current of 200mA. A 15V zener diode protects the LDO
from high input voltages, but adds a few microamps to
the no-load input current of the MAX256.
+5V to Isolated, Regulated +3.3V
In Figure 3, the MAX1658 LDO is used with the TGM-
H281NF transformer and a 2-diode push-pull rectifier
(Figure 1A). This topology produces approximately
+4.5V at a current of 350mA. The MAX1658 produces a
regulated +3.3V output voltage.
+5V to Isolated, Regulated +12V
In Figure 4, the 7812 LDO is used with the TGM-
H281NF transformer and the voltage doubler network
(Figure 1B). This circuit produces approximately
+12.5V at a load current of 150mA. The 7812 produces
a regulated +12V output.
+5V to Isolated, Regulated ±15V
In Figure 5, the MAX256 is used with two TGM-280NS
transformers and voltage doubler networks (Figure 1B)
to supply 20V to a pair of 7815 regulators. The circuit
produces a regulated ±15V at 50mA.
Isolated DAC/ADC Interface for Industrial
Process Control
The MAX256 provides isolated power for data convert-
ers in industrial process control applications (Figure 6).
The 3W isolated power output capability allows for data
converters operating across multiple isolation barriers.
The power output capability also supports circuitry for
signal conditioning and multiplexing.
Isolated RS-485/RS-232 Data Interfaces
The MAX256 provides power for multiple transceivers in
isolated RS-485/RS-232 data interface applications. The
3W isolated power output capability of the MAX256
allows more than ten RS-485 transceivers simultaneously.
Isolated Power Supply
The MAX256 allows a versatile range of secondary-side
rectification circuits (see Figure 1). The secondary
transformer winding can be wound to provide a wide
range of isolated voltages. The MAX256 delivers 3W of
power to the transformer with a +5V supply (-40°C to
+85°C). The MAX256 produces up to 2.5W over the
+85°C to +125°C temperature range. For a supply volt-
age of +3.3V, the MAX256 delivers 2W of power to the
transformer over the -40°C to +85°C temperature
range, and 1.4W between +85°C and +125°C. Figure 8
shows a +5V to isolated +5V application that delivers
up to 500mA. In Figure 9, the MAX256 is configured to
provide +5V from a +3.3V supply at 350mA, and in
Figure 10, the MAX256 provides isolated +15V and -
15V at a total current up to 75mA.
The MAX256 provides the advantages of the full-bridge
converter topology, including multiple isolated outputs,
step-up/step-down or inverted output, relaxed filtering
requirements, and low output ripple.
Power-Supply Decoupling
Bypass V CC to ground with a 0.47μF ceramic capacitor
as close to the device as possible. Additionally, place a
4.7μF capacitor from V CC to ground.
Exposed Paddle
Ensure that the exposed paddle is soldered to the bot-
tom layer ground for best thermal performance. Failure
to provide a low thermal impedance path to the ground
plane will result in excessive junction temperatures
when delivering maximum output power.
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX256ASA/V+T | 制造商:Maxim Integrated Products 功能描述:3W PRIMARY-SIDE TRANSFORMER H-BRIDGE DRIVER FOR ISOLATED SUP - Tape and Reel |
| MAX256ASA+ | 功能描述:功率驱动器IC 3W Primary-Side H-Bridge Driver 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 |
| MAX256ASA+ | 制造商:Maxim Integrated Products 功能描述:IC TRANSFORMER H-BRIDGE DRIVER 1A 8-SOI |
| MAX256ASA+T | 功能描述:功率驱动器IC 3W Primary-Side H-Bridge Driver 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 |
| MAX256ASA-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 |
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