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A7335 Datasheet(PDF) 14 Page - AIT Components Ltd.

Part No. A7335
Description  DC-DC CONVERTER BUCK SYNCHRONOUS CV/CC
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Maker  AITCOMPONENTS [AIT Components Ltd.]
Homepage  http://aitcomponents.com
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 14 page
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AiT Semiconductor Inc.
www.ait-ic.com
A7335
DC-DC CONVERTER BUCK (STEP-DOWN)
30V, 3.5A SYNCHRONOUS CV/CC
REV1.0
- NOV 2017 RELEASED -
- 14 -
STABILITY COMPENSATION
Figure 5. Stability Compensation
CCOMP2 is needed only for high ESR output capacitor.
The feedback loop of the IC is stabilized by the components at the COMP pin, as shown in Figure 5.
The DC loop gain of the system is determined by the following equation:
AVDC =
OUT
I
0.808V
AVEAGCOMP
The dominant pole P1 is due to CCOMP:
fP1 =
COMP
VEA
EA
C
A
2
G
π
The second pole P2 is the output pole:
fP2 =
OUT
OUT
OUT
C
V
2
I
π
The first zero Z1 is due to RCOMP and CCOMP:
fZ1 =
COMP
COMP
C
R
2
1
π
And finally, the third pole is due to RCOMP and CCOMP2 (if CCOMP2 is used):
fP3 =
COMP2
COMP
C
R
2
1
π
The following steps should be used to compensate the IC:
STEP 1. Set the cross over frequency at 1/10 of the switching frequency via RCOMP:
RCOMP =
0.808V
x
G
10G
f
C
V
2
COMP
EA
SW
OUT
OUT
π
(
Ω)
STEP 2. Set the zero fZ1 at 1/4 of the cross over frequency. The equation for CCOMP is:
CCOPM =
COMP
SW
R
f
2
π
4
(F)




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