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SC2449 데이터시트(PDF) 1 Page - Semtech Corporation |
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SC2449 데이터시트(HTML) 1 Page - Semtech Corporation |
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1 / 20 page ![]() POWER MANAGEMENT 1 www.semtech.com SC2449 BI-Phase/Dual Controller .eatures Applications Revision 4, May 2002 Typical Application Circuit Description K Selectable dual output or bi-phase operation K Direct drive for N-channel MOS.ETs K Undervoltage lockout K Synchronization to external clock K Multi-converter synchronization K Soft start K .ast transient response K Max duty cycle 45% K Output over voltage protection K Thermal shutdown K Power supplies for advanced telecoms/datacoms K SO IP, Ethernet and PABX power supplies The SC2449 can be configured as a dual converter or a bi-phase converter for high current applications. The part is designed for point of use power supplies with 8.5-28V nominal backplane power sources. Multiple supplies can be synchronized together to prevent low frequency har- monics on the backplane. The power dissipation is con- trolled using a novel low voltage supply technique, allow- ing high speed and integration, with the high drive cur- rents to ensure low MOS.ET switching loss. The use of high speed switching circuits allows very nar- row PWM outputs down to 15:1 voltage ratios. Single pin compensation for each channel simplifies develop- ment as well as reducing external pin count. Capable of driving MOS.ETs via external driver transis- tors for phase currents beyond 20A. |
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