Datasheet
V = 100 mV/div (ac coupled)
OUT
Time = 1 µs/div
Load Current = 1 A/div
Load step = 0.75 A to 2.25 A
Slew rate = 50 mA / µsec
100 1000 10000 100000 1000000
−60
−50
−40
−30
−20
−10
0
10
20
30
40
50
60
−180
−150
−120
−90
−60
−30
0
30
60
90
120
150
180
Frequency (Hz)
Gain (dB)
Phase (°)
Gain
Phase
G005
0
10
20
30
40
50
60
70
80
90
100
0 0.5 1 1.5 2 2.5 3
Output Current (A)
Efficiency (%)
V
IN
= 3.3 V
V
IN
= 5 V
G001
0
10
20
30
40
50
60
70
80
90
100
0.001 0.01 0.1 1 10
Output Current (A)
Efficiency (%)
V
IN
= 3.3 V
V
IN
= 5 V
G002
× p × × ×
REF
CO
OUT
1
C7 =
V
2 R6 F
V
TPS5432
www.ti.com
SLVSB89A –MARCH 2012–REVISED OCTOBER 2012
This zero and pole pair is not independent. Once the zero location is chosen, the pole is fixed as well. For
optimum performance, the zero and pole should be located symmetrically about the intended crossover
frequency. The required value for C10 can calculated from Equation 23.
(23)
For this design the calculated values for the compensation components are R3 = 4.19 kΩ , C4 = 7596 pF, C5 =
76 pF and C7 = 475 pF. Using standard values, the compensation components are R3 = 4.22 kΩ ,C4 = 8200 pF,
C5 = 82 pF and C7 = 470 pF.
APPLICATION CURVES
Figure 21. EFFICIENCY vs LOAD CURRENT Figure 22. EFFICIENCY vs LOAD CURRENT
Figure 23. TRANSIENT RESPONSE, 1.5 A STEP Figure 24. CLOSED LOOP RESPONSE, V
IN
= 5 V,
I
OUT
= 1.5 A
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