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UC2901D 参数 Datasheet PDF下载

UC2901D图片预览
型号: UC2901D
PDF下载: 下载PDF文件 查看货源
内容描述: 反馈产生器|双极|专科| 14PIN |塑料\n [FEEDBACK GENERATOR|BIPOLAR|SOP|14PIN|PLASTIC ]
分类和应用:
文件页数/大小: 7 页 / 399 K
品牌: TI [ TEXAS INSTRUMENTS ]
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UC1901  
UC2901  
UC3901  
Isolated Feedback Generator  
FEATURES  
DESCRIPTION  
An Amplitude-Modulation System for  
Transformer Coupling an Isolated  
Feedback Error Signal  
The UC1901 family is designed to solve many of the problems associ-  
ated with closing a feedback control loop across a voltage isolation  
boundary. As a stable and reliable alternative to an optical coupler, these  
devices feature an amplitude modulation system which allows a loop er-  
ror signal to be coupled with a small RF transformer or capacitor.  
Low-Cost Alternative to Optical  
Couplers  
The programmable, high-frequency oscillator within the UC1901 series  
permits the use of smaller, less expensive transformers which can readily  
be built to meet the isolation requirements of today's line-operated power  
systems. As an alternative to RF operation, the external clock input to  
these devices allows synchronization to a system clock or to the switch-  
ing frequency of a SMPS.  
Internal 1% Reference and Error  
Amplifier  
Internal Carrier Oscillator Usable to  
5MHz  
Modulator Synchronizable to an  
External Clock  
An additional feature is a status monitoring circuit which provides an active-  
±
low output when the sensed error voltage is within 10% of the reference.  
Loop Status Monitor  
The DRIVERA output, DRIVERB output, and STATUS output are disabled  
until the input supply has reached a sufficient level to allow proper operation  
of the device.  
Since these devices can also be used as a DC driver for optical couplers,  
the benefits of 4.5 to 40V supply operation, a 1% accurate reference, and a  
high gain general purpose amplifier offer advantages even though an AC  
system may not be desired.  
UC1901 SIMPLIFIED SCHEMATIC  
µ
µ
µ
UDG-98080  
11/98  
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