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SC4808B-2 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC4808B-2 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 28 page  1 www.semtech.com SC4808B-2 High Performance Dual Ended PWM Controller POWER MANAGEMENT Revision: Dec. 9, 2009 Description Features Applications Typical Application Circuit u 120µA starting current u Pulse by pulse current limit u Programmable operation up to 1MHz u Internal soft start u Programmable line undervoltage lockout u Over current shutdown u Dual output drive stages on push-pull configuration u Programmable internal slope compensation u Programmable mode of operation (peak current mode or voltage mode) u External frequency synchronization u Bi-phase mode of operation u -40 to 105 °C operating temperature u MSOP-10 Lead-free package. This product is fully WEEE and RoHS compliant u Telecom equipment and power supplies u Networking power supplies u Industrial power supplies u Push-pull converter u Half bridge converter u Full bridge converter u Isolated VRM’s Vo Vin RSENSE Gnd_Out SYNC Gnd_In FB GND REF LUVLO OUTA OUTB CS VCC SYNC RC SC4808 The SC4808B-2 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 components thus saving cost and valuable board space. An internal ramp on the Current Sense pin allows Internal Slope Compensation 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 components. A unique oscillator is used to synchronize two SC4808B- 2’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 components. 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 components. The SC4808B-2 also features a turn on threshold of 4.4V and is available in MSOP-10 package. |
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