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ADP2164ACPZ-R7 Scheda tecnica(PDF) 16 Page - Analog Devices

Il numero della parte ADP2164ACPZ-R7
Spiegazioni elettronici  6.5 V, 4 A, High Efficiency
PDF  20 Pages
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

ADP2164ACPZ-R7 Scheda tecnica(HTML) 16 Page - Analog Devices

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ADP2164
Data Sheet
Rev. 0 | Page 16 of 20
APPLICATIONS INFORMATION
The typical application circuit for the ADP2164 is shown in
Figure 38.
ADP2164ACPZ
CIN
47µF
X5R
10V
COUT1
47µF
X5R
6.3V
COUT2
100µF
X5R
6.3V
VOUT
1.2V
4A
VIN
3.3V
SYNC
TRK
FB
RT
SW
SW
SW
PVIN
GND PGND PGND PGND
L
0.8µH
RTOP
10kΩ
RBOT
10kΩ
L: MSS1048-801NL COILCRAFT
CIN: C3225X5R1A476M TDK
COUT1: C3225X5R0J476M TDK
COUT2: C3225X5R0J107M TDK
12
11
10
9
4
3
2
1
56
7
8
PGOOD
C1
0.1µF
EN
R1
10Ω
R2
10kΩ
PVIN
16
15
VIN
14
13
Figure 38. Typical Application Circuit
OUTPUT VOLTAGE SELECTION
The output voltage of the adjustable version of the ADP2164 is
set by an external resistive voltage divider using the following
equation:
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
×
=
BOT
TOP
OUT
R
R
V
1
6
.
0
To limit output voltage accuracy degradation due to FB bias
current (0.1 μA maximum) to less than 0.5% (maximum),
ensure that RBOT is less than 30 kΩ.
INDUCTOR SELECTION
The inductor value is determined by the operating frequency,
input voltage, output voltage, and ripple current. A small inductor
value provides larger inductor current ripple and fast transient
response but degrades efficiency; a large inductor value provides
small inductor current ripple and good efficiency but slows
transient response. For a reasonable trade-off between transient
response and efficiency, the inductor current ripple, ΔIL, is typically
set to one-third the maximum load current. The inductor value
is calculated using the following equation:
(
)
S
L
OUT
IN
f
I
D
V
V
L
×
Δ
×
−
=
where:
VIN
is the input voltage.
VOUT
is the output voltage.
ΔIL
is the inductor current ripple.
fS
is the switching frequency.
D
is the duty cycle (VOUT/VIN).
The ADP2164 uses slope compensation in the current control
loop to prevent subharmonic oscillations when the duty cycle
is larger than 50%. The internal slope compensation limits the
minimum inductor value.
The negative current limit (−1.3 A) also limits the minimum
inductor value. The inductor current ripple (ΔIL) calculated by
the selected inductor should not exceed 2.6 A.
The peak inductor current should be kept below the peak current
limit threshold and is calculated using the following equation:
2
L
O
PEAK
I
I
I
Δ
+
=
Ensure that the rms current of the selected inductor is greater
than the maximum load current and that its saturation current
is greater than the peak current limit of the converter.
OUTPUT CAPACITOR SELECTION
The output capacitor value is determined by the output voltage
ripple, load step transient, and loop stability. The output ripple
is determined by the ESR and the capacitance.
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
×
×
+
×
Δ
=
Δ
S
OUT
L
OUT
f
C
ESR
I
V
8
1
The load step transient response depends on the inductor, the
output capacitor, and the current control loop.
The ADP2164 has integrated loop compensation for simple
power design. Table 5 and Table 6 show the recommended
values for inductors and capacitors for the ADP2164 based
on the input and output voltages for the part. X5R or X7R
dielectric ceramic capacitors are highly recommended.
Table 5. Recommended L and COUT Values at fS = 1.2 MHz
VIN (V)
VOUT (V)
L (μH)
COUT (μF)
3.3
1.0
0.8
100 + 100
3.3
1.2
0.8
100 + 47
3.3
1.5
1
100 + 47
3.3
1.8
1
100
3.3
2.5
1
47
5
1.0
0.8
100 + 100
5
1.2
0.8
100 + 47
5
1.5
1
100 + 47
5
1.8
1
100
5
2.5
1
47
5
3.3
1
47



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