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TPS40140RHHTG4 Datasheet(PDF) 32 Page - Texas Instruments |
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TPS40140RHHTG4 Datasheet(HTML) 32 Page - Texas Instruments |
32 / 68 page ![]() VOUT CEXT R1 + + 0.7 V + U3 + + From CSx Amplifier + Ramp1 U7 Comparator PWM Logic FBx TRKx Error Amplifier COMPx RBIAS 12 µA 6 µA VREF UDG−06031 0.7 VOUT FBx 0 0 t0 t1 2.4 1.4 PGOOD TRKx VPRE-BIAS 6 µA 12 µA FBx VOUT t2 t3 UDG-12121 TPS40140 SLUS660I – SEPTEMBER 2005 – REVISED JANUARY 2015 www.ti.com Figure 30. Soft-Start With PreBiased Output Waveforms Figure 31. Implementation of PreBiased Output DESIGN HINT If the prebiased 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. 9.1.8 Track Function in Configuring a Slave Channel The TRKx pin is internally clamped to 2.4 V. To configure a channel as a slave, the TRKx pin is pulled up externally to 5 V. This configures the output of the error amplifier, COMPx, for that channel to be a high impedance, allowing the master COMP signal to control the slave channel. 32 Submit Documentation Feedback Copyright © 2005–2015, Texas Instruments Incorporated Product Folder Links: TPS40140 |
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