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TPS54719 Fiches technique(PDF) 18 Page - Texas Instruments

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No de pièce TPS54719
Description  2.95 V to 6 V Input, 7-A Synchronous Step Down SWIFT??Converter
Download  36 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

TPS54719 Fiches technique(HTML) 18 Page - Texas Instruments

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ps
L
Adc = gm
R
´
s
1+
2 ×
z
vo
= Adc
vc
s
1+
2 ×
p
æ
ö
ç
÷
p
¦
è
ø
´
æ
ö
ç
÷
p
¦
è
ø
VO
RL
VC
fp
fz
Adc
gmps
RESR
COUT
VSENSE
COMP
VO
R1
R3
C1
C2
R2
CO RO
gm
250 µA/V
Power Stage
25 A/V
PH
RESR
COUT
RL
b
a
c
0.6 V
TPS54719
SLVSB69 – JUNE 2012
www.ti.com
Figure 30. Small Signal Model for Loop Response
SIMPLE SMALL SIGNAL MODEL FOR PEAK CURRENT MODE CONTROL
Figure 30 is a simple small signal model that can be used to understand how to design the frequency
compensation. The TPS54719 power stage can be approximated to a voltage controlled current source (duty
cycle modulator) supplying current to the output capacitor and load resistor. The control to output transfer
function is shown in Equation 10 and consists of a dc gain, one dominant pole and one ESR zero. The quotient
of the change in switch current and the change in COMP pin voltage (node c in Figure 30) is the power stage
transconductance. The gm for the TPS54719 is 25 A/V. The low frequency gain of the power stage frequency
response is the product of the transconductance and the load resistance as shown in Equation 11. As the load
current increases and decreases, the low frequency gain decreases and increases, respectively. This variation
with load may seem problematic at first glance, but the dominant pole moves with load current [see Equation 12].
The combined effect is highlighted by the dashed line in the right half of Figure 31. As the load current
decreases, the gain increases and the pole frequency lowers, keeping the 0-dB crossover frequency the same
for the varying load conditions which makes it easier to design the frequency compensation.
Figure 31. Simple Small Signal Model and Frequency Response for Peak Current Mode Control
(10)
(11)
18
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Product Folder Link(s): TPS54719


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