SC4808B-1
SC4808B-1 is High Performance Dual Ended PWM Controller manufactured by SEMTECH.
High Performance Dual Ended PWM Controller
POWER MANAGEMENT Description
The SC4808B-1 is a dual-ended, high frequency, integrated PWM controller, optimized for isolated applications that require minimum space. It can be configured for current or voltage mode operation with required control circuitry where secondary side error amplifier is used. Some of the key Features are high frequency operation of 1 MHz that allows the use of smaller ponents thus saving cost and valuable board space. An internal ramp .. on the Current Sense pin allows Internal Slope pensation programmed by an external resistor. Other Features include programmable frequency up to 1MHz, Pulse by Pulse current and Line Monitoring Input with Hysteresis to reduce stress on the power ponents. A unique oscillator is used to synchronize two SC4808B1’s to work out of phase. This minimizes the input and output ripple thus reducing noise on the output line and reducing stress and size of input/output filter ponents. The dual outputs can be configured in Push-Pull, Half Bridge and Full Bridge format with programmable dead time between two outputs depending on the size of the timing ponents. The SC4808B-1 also Features a turn on threshold of 4.4V and is available in MSOP-10 package.
Features
120µA starting current Pulse by pulse current limit Programmable operation up to 1MHz Internal soft start Programmable line undervoltage lockout Over current shutdown Dual output drive stages on push-pull configuration Programmable internal slope pensation Programmable mode of operation (peak current mode or voltage mode) External frequency synchronization Bi-phase mode of operation -40 to 105 °C operating temperature MSOP-10 lead free package. This product is fully WEEE and Ro HS pliant Tele equipment and power supplies Networking power supplies Industrial power supplies Push-pull converter Half bridge converter Full bridge converter Isolated...
