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TPS53851 Datasheet(PDF) 18 Page - Texas Instruments |
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TPS53851 Datasheet(HTML) 18 Page - Texas Instruments |
18 / 64 page ![]() 0.7 FBx 0 0 t0 t1 2.4 1.4 TRKx FBx t2 t3 VOUT VREG VPRE−BIAS 12 µA 6 µA R1 R BIAS C EXT + + V REF 0.7 V + U3 + + From CSx Amplifier + Ramp1 U7 Comparator 12 mA PWM Logic 6 mA FBx TRKx Error Amplifier COMPx UDG-09146 TPS53851 V OUT TPS53851 SLUS985 – DECEMBER 2009 www.ti.com Figure 5-2. Soft-Start with PreBiased Output Waveforms Figure 5-3. Implementation of PreBiased Output DESIGN HINT If the pre-biased is greater than the regulation voltage, the controller does not start. This is a condition of an overvoltage being applied before the controller starts PWM switching. 18 APPLICATION INFORMATION Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): TPS53851 |
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