Datasheet

Vref
VO
R1
R3
C1
C2
R2
CO
5pF
RO
gm
ea
COMP
VSENSE
Type 2A
Type 2B
R3
C1
¦
´ ´ p
OUT ESR
1
z =
C R 2
¦
´ ´ p
OUT L
1
p =
C R 2
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
TPS54318
www.ti.com SLVS975A –SEPTEMBER 2009–REVISED SEPTEMBER 2013
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SMALL SIGNAL MODEL FOR FREQUENCY COMPENSATION
The TPS54318 uses a transconductance amplifier for the error amplifier and readily supports two of the
commonly used frequency compensation circuits. The compensation circuits are shown in Figure 33 . The Type 2
circuits are most likely implemented in high bandwidth power-supply designs using low ESR output capacitors. In
Type 2A, one additional high frequency pole is added to attenuate high frequency noise.
Figure 33. Types of Frequency Compensation
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