Electronic Components Datasheet Search

Delete All
ON OFF
 ALLDATASHEET.COM Part No.DescriptionMarking X

## TPS51513RHBT Datasheet(PDF) 22 Page - Texas Instruments

 Part No. TPS51513RHBT Description SINGLE PHASE, D-CAP SYNCHRONOUS BUCK CONTROLLER Download 39 Pages Scroll/Zoom 100% Maker TI1 [Texas Instruments] Homepage http://www.ti.com Logo

## TPS51513RHBT Datasheet(HTML) 22 Page - Texas Instruments

 22 / 39 page CS(eff )CSDROOPML LRARGR-´=´SLEWSLEWSLEWKVRSR´=IMONIMONIMONCSVRKV=´( )CSMAXCS effVRI=´CSCSINTIMONIMON2IMON8VARRV´´´=TPS51513SLUS956A – JUNE 2009 – REVISED FEBRUARY 2010www.ti.comStep Seven: Set the load line. The load line is set by the droop resistor knowing RL-L and RCS_Eff.(15)RDROOP = 5.23 kΩ.Step Eight: Select the DROOP capacitor.The DROOP capacitor is used to provide high-frequency filtering of the voltage loop. Use values under 100 pF. Ahigher value provides less jitter for steady-state operation, but slows down the transient response.Step Nine: Calculate RSLEW. RSLEW sets both slew rates:1. Sleep exit slew rate.2. Soft-start and soft-stop exit rate is 1/8 of the sleep exit rateSet the sleep rate to 6 mV/ms to allow 20% for tolerances. From Equation 3):(16)In this case, RSLEW is terminated to GND. KSLEW = 1.25x109 and VSLEW = 0.45 V. For a slew rate (SR) of 6 mV/msnominal, 5 mV/mS minimum, RSLEW = 90.9 kΩ.Step Ten: Calculate IMON resistors.From Equation 6,(17)And,where•VCS = 29.8 mV•KIMON = 2mA/mV(18)The IMONC pin is connected to 3.3 V; to allow for tolerances, a full scale value of 3.1 V (VIMON) is desired. Then,RIMON = 47.5 kΩ.In order to increase the accuracy of the current monitor overtemperature the IMON2 pin is provided to match thetemperature coefficients of two critical resistors in the circuit. Connect a resistor from IMON2 to VREF.After determining the full-scale voltage on the IMON output (VIMON) and selecting RIMON, the value of RIMON2resistor is from Equation 7:where•ACSINT = 6•RIMON2 = 24.3kΩ(19)22Submit Documentation FeedbackCopyright © 2009–2010, Texas Instruments IncorporatedProduct Folder Link(s) :TPS51513