Datasheet

0
50
60
90
100
20
0
30
h - Efficiency - %
0.5 1.0 2.01.5 2.5 3.0 3.5
9 V
10 V
11 V
V
IN
I
OUT
- Load Current - A
80
70
40
10
0
100 1 k 100 k10 k
f
SW
- Switching Frequency - Hz
0
20
80
100
120
40
60
Phase - °
30
40
50
60
10
20
Gain - dB
100 k
PHASE
GAIN
TPS40195
SLUS720E –FEBRUARY 2007–REVISED JULY 2012 www.ti.com
Design Example 3
This design delivers 1 A to 3 A from a 10 V supply. The output voltage may be adjusted from 1 V to 5 V with a
single resistor. The part has 57° of phase margin at a crossover frequency of 59 kHz. The design is built on a
double sided PC board with an active area of 1.5 cm × 3 cm.
Figure 32. Design Example 3 Schematic
EFFICIENCY GAIN AND PHASE
vs vs
LOAD CURRENT FREQUENCY
Figure 33. Figure 34.
32 Copyright © 2007–2012, Texas Instruments Incorporated