PFC CONTROLLER IC在LED电源的单级应用的探讨

曾经有收到过这样的要求(spec):
Model I:
1. INPUT:90~264VAC
2. PF: 0.9 or above
3. Efficiency: >80%
4. Standby power: < 0.5W or below
5. output: 25V@0.5A
6. THD: <10%
7. OUTPUT CABLE: 3.5M@ 18AWG with switching.
8. Casing size: general 12W's casing
9. Loading: separated 12W LED lamp
10. Comply safety UL1310 and EMC EN55022 Standard or eqv.

Model II:
1. INPUT:90~264VAC
2. PF: 0.9 or above
3. Efficiency: >85%
4. Standby power: < 0.5W or below
5. output: 25V@1.5A
6. THD: <10%
7. OUTPUT CABLE: 3.5M@ 18AWG with switching.
8. Casing size: general 36W's casing
9. Loading: separated 36W LED lamp
10. Comply safety UL1310 and EMC EN55022 Standard or eqv.

    根据这些要求,我们非常难以选择方案,因为还有一个最为关键的成本要求跟普通的适配器价格差不多,即使后来有选用SINGLE STAGE PFC方案来实现,但其中的问题也非常之多.有这方面的经验大家可以探讨一下!