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LM25115A Arkusz danych(PDF) 11 Page - Texas Instruments |
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LM25115A Arkusz danych(HTML) 11 Page - Texas Instruments |
11 / 26 page Phase signal RAMP pin HS pin 12V 12V 6V 6V Main Output = 3.3V Secondary Output = 2.5V PWM Threshold SYNC CLK RAMP BUFFER 2.5k 15 PA CLK Isync Isync x 3 2.5k Phase Signal RSYNC CRAMP LM25115A www.ti.com SNVS501B – FEBRUARY 2007 – REVISED APRIL 2013 Figure 12. Line Feed-Forward Diagram Figure 13. Line Feed-Forward Waveforms The recommended SYNC input current range is 50µA to 150µA. The SYNC pin resistor (RSYNC) should be selected to set the SYNC current (ISYNC) to 150µA with the maximum phase signal amplitude, VPHASE(max). This will ensure that ISYNC stays within the recommended range over a 3:1 change in phase signal amplitude. The SYNC pin resistor is therefore: RSYNC = (VPHASE(max) / 150µA) - 2.5kΩ Once ISYNC has been established by selecting RSYNC, the RAMP signal slope/amplitude may be programmed by selecting the proper RAMP pin capacitor value. The RAMP signal slope should be selected to provide adequate slope compensation for the Valley current mode control scheme (Please refer to the Valley Current Mode Control section). The recommended peak amplitude of the ramp waveform is 1.75V. Copyright © 2007–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM25115A |
Podobny numer części - LM25115A |
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Podobny opis - LM25115A |
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