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Vishay Sip11206中间母线转换(IBC)方案

作者:  时间:2009-11-27 13:29  来源:
Vishay公司的Sip11206是半桥中间母线转换器(IBC)初级控制器,工作电压36V到75V,能经受住100ms 100V的瞬变电压,用来控制和驱动半桥转换器中的低边和高边开关器件,并集成了± 1.6 A低边和高边MOSFET驱动器, 开关振荡器频率可从200 kHz 到1 MHz编程,非常适合于绝缘式应用如通信,数据通信,以及其它需要IBC架构和标准母线电压如48V到更低电压如24V,12V,9V或5V的转换.本文介绍了Sip11206的主要特性,方框图,典型应用电路以及采用Sip11205或Sip11206的IBC演示板的初级,次级和基板的电路图和所用元件列表.

SiP11206 is a controller for the primary side of a half-bridge intermediate bus converter (IBC). It is ideally suited for isolated applications such as telecom, data communications and other products requiring an IBC architecture and conversion of standard bus voltages such as 48 V to a lower intermediate voltage, where high efficiency is required at low output voltages (24 V, 12 V, 9 V or 5 V).
Designed to operate within the telecom voltage range of 36 V to 75 V and withstand 100 V transients for a period of 100 ms, the IC is designed for controlling and driving both the low- and high-side switching devices of a half-bridge converter.

The SiP11206 operates with a fixed duty cycle to provide the highest efficiency over a wide input voltage range. SiP11206 has advanced current monitoring and control circuitry, which allows the user to set the maximum current in the primary circuit. This feature acts as protection against overcurrent, output short circuit. Current sensing is by means of a sense resistor connected in series with the primary low-side
MOSFET.

Sip11206主要特性:
36 V to 75 V input voltage range
Withstand 100 V, 100 ms transient capability
Integrated ± 1.6 A typical high- and low-side MOSFET drivers
Oscillator frequency is programmable from 200 kHz to 1 MHz and can be externally synchronized
High voltage pre-regulator operates during start-up
Current sensing on primary low-side switch
Hiccup mode
System low input voltage detection
Chip UVLO function
Programmable soft-start function
Over temperature protection (160 °C)
Greater than 95 % efficiency

Sip11206应用:
Intermediate bus architectures
Telecom and Datacom
Routers and servers
Storage area network
Base station
1/8 and 1/4 bricks



图1.Sip11206方框图



图2.Sip11206典型应用电路

采用Sip11205或Sip11206的IBC演示板

Intermediate Bus Converter Demo Board Using SiP11205 or SiP11206

Both SiP11205 and SiP11206 are controllers for half-bridge intermediate bus converters. The difference between SiP11205 and SiP11206 is that SiP11205 has built-in feedforward circuitry and SiP11206 does not. The feed-forward circuitry adjusts duty cycle when input voltage changes. The duty cycle increases with the decrease of input voltage and the duty cycle decreases while input voltage increases. This
feed-forward feature allows an IBC to be semi-regulated.

While SiP11206 allows better efficiency throughout the whole range of input voltage, since its duty cycle can be set to an optimized value for the whole range of input voltage.
Therefore SiP11205 is more suited for point of load applications that require tighter range of input voltage, which is the output of an SiP11205 controlled IBC, and SiP11206 is better for applications that efficiency is a key for whole input voltage range.



图3.IBC演示板初级电路图



图4.IBC演示板次级电路图



图5.IBC演示板基板电路图

表1.IBC所用元件列表





表2.基板元件列表


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