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AIC2510PM5 Datasheet(PDF) 8 Page - Analog Intergrations Corporation

Part # AIC2510PM5
Description  3A STEP-DOWN PWM CONVERTER
Download  11 Pages
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Manufacturer  AIC [Analog Intergrations Corporation]
Direct Link  http://www.analog.com.tw
Logo AIC - Analog Intergrations Corporation

AIC2510PM5 Datasheet(HTML) 8 Page - Analog Intergrations Corporation

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AIC2510
8
APPLICATION INFORMATION (Continued)
Components Selection
Inductor
The inductor selection depends on the operating
frequency of the AIC2510. The ripple current ∆IL
interrelates with inductor value. A lower inductor
value gets a higher ripple current. Besides, a
higher VIN or VOUT can also get the same result.
The inductor value can be calculated as the
following formula.
( )(
)


=
IN
OUT
OUT
L
V
V
1
V
I
f
1
L
Users can define the acceptable ∆IL to gain a
suitable inductor value.
Diode
The diode current rating must be higher than 1.3
times maximum load current. Also, if the power
supply needs to resist a continuous output short,
the diode should have a current ration equal to the
maximum current limit of the AIC2510. The
reverse voltage rating of the diode should be
higher than 1.25 times input voltage and the diode
must be fast. The reverse recovery time of the
diode is short.
Capacitor
The selection of output capacitor depends on the
suitable
ripple voltage. Lower ripple voltage
corresponds to lower ESR (Equivalent Series
Resistor) of output capacitor. Typically, once the
ESR is satisfied with the ripple voltage, the value
of capacitor is adequate for filtering. The formula
of ripple voltage is as below:
+
=
OUT
L
OUT
fC
8
1
ESR
I
V
The typical input capacitor is 470uF. But as the
temperature decreases, the input capacitor needs
to increase to stabilize the circuit.
Example
Assume the input voltage is 12V, output voltage is
5V and maximum load current is 3A. The output
ripple must be smaller than 2% of output voltage
Inductor selection:
( )(
)


=
IN
OUT
OUT
L
V
V
V
I
f
L
1
1
uH
k
4
.
32
12
5
1
5
6
.
0
150
1
=
×
×
×
=
Here, the delta IL is 0.6A. So we choose 33uH
inductor.
Output capacitor selection:
mV
fC
ESR
I
V
OUT
L
OUT
100
8
1
<


+
=
We choice the capacitor value: ESR=0.12,
capacitance=220uF
mV
mV
fC
ESR
I
V
OUT
L
OUT
100
74
8
1
<
=


+
=
Diode selection:
The full load is 3A and delta IL is 0.6A, so the diode
current rating must be higher than 3.6A.
CF Capacitor for adj version
As using the AIC2510 adj version, the CF
capacitor is required to provide additional stability.
In different condition, the CF capacitor must be
changed to make the circuit stable.
Output
Voltage (V)
Input
Voltage (V)
R1
(
Ω)
R2
(
Ω)
CF
(pF)
1.8
7
36k
82k
1000
4
12
180k
82k
360
6
12
180k
47k
360
8
15
180k
33k
360
10
18
150k
22k
470
15
25
110k
10k
560
Table 1


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