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CS51220 Datasheet(PDF) 13 Page - ON Semiconductor |
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CS51220 Datasheet(HTML) 13 Page - ON Semiconductor |
13 / 16 page CS51220 http://onsemi.com 13 Program Oscillator Frequency CS51220 requires an external capacitor to program the oscillator frequency. The internally trimmed charge/discharge current determines the maximum duty cycle. The capacitor for a required switching frequency fS can be calculated by: CT + 13400 fS * 95 where: CT = Timing capacitance is in pF fS = Switching frequency is in kHz Figure 16 shows the relationship of CT and fS. 200 CT (pF) Figure 16. Operating Frequency 600 550 500 450 400 350 300 250 200 150 100 100 300 400 500 600 Synchronized Dual Converters with Soft Hiccup and Feed Forward The circuits shown in Figures 17 and 18 illustrate typical applications for a dual output supply using independent but synchronized converters. These circuits demonstrate the use of the soft hiccup, feed forward, volt−second control and synchronization features of the CS51220. In Figure 17, the feed forward circuit has a volt−second constant of 82 V/μs. This would limit the duty factor to 0.51 at 48 V input. With a turns ratio of 4:1 on the power transformer and 48 V input, a duty factor of 0.46 is required for 5.0 V output. This converter serves as the master synchronization generator. The voltage on the VSD pin establishes the delay as it is compared to the ramp generated on the CT pin. Adjustable synchronization allows the conduction time for the two converters to be adjusted so that they are not on at the same time. This greatly reduces the ripple current from the 48 V source. In Figure 18, the feed forward circuit has a volt−second constant of 63 V/μs. This would limit the duty factor to 0.39 at 48 V input. With a turns ratio of 4:1 on the power transformer and 48 V input, a duty factor of 0.33 is required for 3.3V output. |
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