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SD46520 Datenblatt(PDF) 6 Page - Silan Microelectronics Joint-stock

Teilenummer SD46520
Bauteilbeschribung  400KHZ 2A STEP-DOWN DC-DC CONVERTER
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Hersteller  SILAN [Silan Microelectronics Joint-stock]
Direct Link  http://www.silan.com.cn
Logo SILAN - Silan Microelectronics Joint-stock

SD46520 Datenblatt(HTML) 6 Page - Silan Microelectronics Joint-stock

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SD46520
Where,
is output voltage ripple,
is inductor current ripple, ESR is the equivalent serial resistor of
output capacitor.
O
ΔV
L
ΔI
The freewheeling diode selection
Select the schottky diode as freewheeling diode to reduce the loss caused by forward voltage drop of the diode.
At the same time, the maximum current of schottky should be higher than 2.4A.
Compensation network
The resistor-capacitor compensation network connected to
COMP pin make sure the stability of the control loop circuit.
As the right figure:
The DC gain of the control loop is:
L
CS
VEA
O
FB
VDC
R
G
A
V
V
A
=
Where, VFB is feedback voltage, 1.22V; VO is setting output
voltage; AVEA is the voltage gain of error amplifier, 400V/V; GCS is the trans-conductance of current sense(about
the value of the output current divided by COMP pin voltage), 1.95A/V; RL is load resistor.
The control loop has two poles of inportance.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
REV:1.0
2009.04.07
Http://www.silan.com.cn
Page 6 of 8
The first pole P1 is decided by the following formula:
C1
OEA
P1
C
R
1
=
f
,
where,
EA
VEA
OEA
G
A
=
R
, GEA is the trans-conductance of error amplifier, 770uA/V.
The second pole P2 is decided by:
O
L
P2
C
R
2
1
=
π
f
The control loop has a main zero Z1, which is decided by:
C1
C
Z1
C
R
2
1
f
=
π
When the output capacitor ESR is large, another zero Z2 is introduced which is decided by:
O
Z2
C
ESR
2
1
f
=
π
.
At this time, it needs to add another compensation capacitor
Cc2 to introduce an additional pole P3 compensate
this zero , and this pole is decided by:
C2
C
P3
C
R
2
1
f
=
π
The system crossover frequency fC is very important. If it’s too high , it will cause the system unstable. If it’s too
low, it will slower the system transient response. In general, fC is about 1/8~1/10 of the switch frequency.
Use the following procedure to choose the value of the compensation components.
First, according to the selected crossover crossover fC, choose the value of compensation resistor Rc:


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