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SC4911 数据表(PDF) 1 Page - Semtech Corporation |
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SC4911 数据表(HTML) 1 Page - Semtech Corporation |
1 / 14 page 1 www.semtech.com SC4911 Bias/Primary Side PWM Controller with Ultra Low Start-up Current POWER MANAGEMENT Revision: April 5, 2006 Description Features Applications Typical Application Circuit Programmable switching frequency up to 500kHz Line UVLO Protection Undervoltage Lockout Low startup current (45µA) Cycle by cycle current limit 8 pin MSOP. Available in Lead-free, fully WEEE and RoHS compliant The SC4911 is a highly integrated bias/primary side PWM controller designed for off-line or isolated dc-dc convert- ers in telecommunication and data communication ap- plications. The high degree of integration minimizes the amount of discrete parts needed and leads to substan- tial cost and space saving converter designs. The circuitry of the SC4911 includes line voltage UVLO featuring startup current less than 50µA and program- mable switching frequency. The device supply is derived from an auxiliary winding on the transformer. The auxil- iary winding could also provide output feedback informa- tion if an optocoupler is not used. Vout R5 R9 C3 R1 R7 C6 D2 C2 D1 U1 SC4911 3 4 5 7 FB COMP ILIM OUT C4 R4 Vin C7 C1 R8 R2 Q1 R6 T1 C8 R3 C5 Telecom isolated converters Offline isolated power supplies Instrumentation power supplies Battery chargers |
类似零件编号 - SC4911 |
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类似说明 - SC4911 |
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