Datasheet

Ccomp =
8 x 10
3
x Rcomp[14]
1
Rcomp = 6 x 10
4
x Rfb1[9] x Cout[13] +
Rfb1[9]
Vout[1]
www.ti.com Quick Guide Design Worksheet
Step 11. Ccomp and Rcomp configure the error amplifier gain characteristics to accomplish a stable
overall loop gain. One advantage of current mode control is the ability to close the loop with only two
feedback components. Calculate the value of Rcomp:
(9)
Selected value of Rcomp: Ohms [14]
Calculate the value of Ccomp
(10)
Selected value of Ccomp: Farads [15]
Step 12. Shown in Table 1 is the Bill of Materials for your design. Transcribe each value [#] from
worksheet above into the following table. Congratulations, you’re done.
2.1 Bill of Materials
Table 1. Bill of Materials
SCH REF PART NUMBER DESCRIPTION VALUE WORK SHEET REF
C1 (Cin) INPUT CAPACITOR [12]
C2 (Cin) OPTIONAL INPUT CAPACITOR [12]
C3 (C
RAMP
) RAMP CAPACITOR [8]
C4 (Css) C2012X7R2A103K CAPACITOR, TDK 0.01µ, 100V --
C5 (Ccomp) COMPENSATION CAP [15]
C6 (Cboot) C2012X7R2A223K CAPACITOR, TDK 0.047µ, 100V --
C7 (Cbyp) C2012X7R1C474M CAPACITOR, TDK 0.47µ, 16V --
C8 (Cout) OUTPUT CAPACITOR [13]
C9 (Cout) OPTIONAL OUTPUT CAPACITOR [13]
D1 SCHOTTKY DIODE [11]
L1 INDUCTOR [7]
R1 (Rfb1) Feedback RESISTOR [10]
R2 (Rfb2) Feedback RESISTOR [9]
R3 (Rt) TIMING RESISTOR [6]
R4 (Rcomp) COMPENSATION RESISTOR [14]
U1 REGULATOR, TI [4]
5
SNVA212B–January 2007–Revised April 2013 AN-1572 Quick Start Guide for a 3 Amp Buck Regulator Using the LM5576
and LM25576
Submit Documentation Feedback
Copyright © 2007–2013, Texas Instruments Incorporated