전자부품 데이터시트 검색엔진 |
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FAN5236 데이터시트(PDF) 4 Page - Fairchild Semiconductor |
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FAN5236 데이터시트(HTML) 4 Page - Fairchild Semiconductor |
4 / 4 page AB-28 APPLICATION BULLETIN 4 7/18/02 FAN5236 Dual Synchronous Buck Converter The FAN5236 PWM controller (Fig. 9) provides high efficiency and regulation for two output voltages adjustable in the range from 0.9V to 5.5V. Synchronous rectification and hysteretic operation at light loads contribute to a high efficiency over a wide range of loads. The hysteretic mode of operation can be disabled separately on each PWM converter if PWM mode is desired for all load levels. Again high efficiency is obtained by using MOSFET’s RDSON for current sensing. Out-of-phase operation with 180-degree phase shift reduces input current ripple. Fig. 9. FAN5236 Block Diagram RC1585/7 Linear Regulators In some cases if the input to output voltage difference is sen- sibly less than the output voltage it make sense to use linear regulators. In Fig.6 Fairchild’s RC1587, 3A and RC1585, 5A linear regulators are showcased. KA5H0365 Offline Converter The high level of simplicity of the AC/DC converter in Fig. 6 is possible thanks the multi-chip approach to integration of the this controller family (Fig. 10). The TO220 package houses two dies, a controller die and a high voltage MOS- FET die on board. Here again power hungry discrete current sense resistors are avoided, in this case by means of a ratioed sense-fet technique on board of the discrete element. For more details and a complete bill of materials please refer to the FAN5092, FAN5236, RC1585, RC1587 and FOD2712 data sheets available on the Fairchild web site. For KA5H0365 please refer to the data sheet as well as to FPS Application Notes for SMPS design available on the Fairchild web site. Conclusion The merging of data, voice and video blurs the line between computing and communications. The smart loads of either application draw from the same advanced, high-density sub- micron low voltage CMOS technologies and require similar solutions for distributed power conversion. Fairchild exper- tise in power conversion for computing and communications offers proven solutions to the merging converged data com- munications market. FAN5236 5 to 24V VCC +5 ILIM1 DDR ILIM2/ REF2 VOUT1 = 2.5V VOUT2 = 1.8V LOUT1 LOUT2 COUT1 COUT2 Q1 Q2 Q3 Q4 PWM1 PWM2 Fig. 10. KA5H0365 converter architecture FB DRAIN GND VCC 32V ck 5µA 1mA 2.5R 1R 7.5V OSC UVLO Volt Ref Voffset Thermal ??? ???? sense S S R R + – + – Q Q sense Sense FET Control IC POR POR |
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