參數(shù)資料
型號(hào)： SC4905BIMSTRT
廠(chǎng)商： Semtech Corporation
英文描述： High Performance Voltage Mode PWM Controller
中文描述： 高性能電壓模式PWM控制器
文件頁(yè)數(shù)： 1/24頁(yè)
文件大?。?/td> 378K
代理商： SC4905BIMSTRT
1
www.semtech.com
SC4905A/B
High Performance Voltage Mode
PWM Controller
POWER MANAGEMENT
Description
The SC4905A/B is a 10 pin BICMOS primary side voltage
mode controller for use in Isolated DC-DC and off-line
switching power supplies. It is a highly integrated solution,
requiring few external components. The device features a
high speed oscillator with integrated feed forward
compensation, accurately programmable maximum duty
cycle, voltage mode of operation, line voltage monitoring,
supply UVLO, low start up current, low voltage current limit
threshold and user accessible reference.
Revision: January 4, 2006
Features
Operation to 1MHz
Accurate programmable maximum duty cycle
Integrated oscillator/voltage feed forward
compensation
Line voltage monitoring
External frequency synchronization
Bi-phase mode of operation for ripple reduction
Under 100μA start-up current
Accessible reference voltage
VDD undervoltage lockout
-40°C to 105°C operating temperature
10-Pin MSOP Lead-free package available.
Fully WEEE and RoHS compliant
Applications
Telecom equipment and power supplies
Networking power supplies
Power over LAN applications
Industrial power supplies
Isolated power supplies
Typical Application Circuit
The SC4905A/B device operates at a fixed frequency,
highly desirable for Telecom applications. Features a
separate SYNC pin which simplifies synchronization to
an external clock. Feeding the oscillator of one device to
the SYNC of another forces biphase operation (180
degrees apart) which reduces input ripple and filter size.
The SC4905A has a typical turn-on threshold of 4.4V
and the SC4905B has a typical turn-on threshold of
about 11.6 volts.
These devices are available in the 10 lead MSOP
package.
相關(guān)PDF資料
PDF描述
SC4905A High Performance Voltage Mode PWM Controller
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SC4910BITSTRT High Performance Secondary Side Controller with Synchronous Rectifier
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