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| 型号： | ADP1872-1.0-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 23/40页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADP1872 |
| 标准包装： | 1 |
| 系列： | * |
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Data Sheet
APPLICATIONS INFORMATION
FEEDBACK RESISTOR DIVIDER
ADP1872/ADP1873
Table 7. Recommended Inductors
The required resistor divider network can be determine for a
given V OUT value because the internal band gap reference (V REF )
is fixed at 0.6 V. Selecting values for R T and R B determines the
minimum output load current of the converter. Therefore, for a
given value of R B , the R T value can be determined by
L
(μH)
0.12
0.22
0.47
0.72
DCR
(mΩ)
0.33
0.33
0.8
1.65
I SAT
(A)
55
30
50
35
Dimensions
(mm)
10.2 × 7
10.2 × 7
14.2 × 12.8
10.5 × 10.2
Manufacturer
Würth Elektronic
Würth Elektronic
Würth Elektronic
Würth Elektronic
Model No.
744303012
744303022
744355147
744325072
R T = R B ×
( V OUT ? 0 . 6 V)
0 . 6 V
0.9
1.2
1.0
1.6
1.8
3.3
28
25
20
13 × 12.8
10.5 × 10.2
10.5 × 10.2
Würth Elektronic
Würth Elektronic
Würth Elektronic
744355090
744325120
7443552100
INDUCTOR SELECTION
The inductor value is inversely proportional to the inductor
1.4
2.0
0.8
3.2
2.6
24
22
27.5
14 × 12.8
13.2 × 12.8
Würth Elektronic
Würth Elektronic
Sumida
744318180
7443551200
CEP125U-0R8
ripple current. The peak-to-peak ripple current is given by
? I L = K I × I LOAD ≈
I LOAD
3
OUTPUT RIPPLE VOLTAGE (ΔV RR )
The output ripple voltage is the ac component of the dc output
( VIN ? V OUT ) V OUT
? I L × f SW
where K I is typically 0.33.
The equation for the inductor value is given by
L = ×
VIN
where:
VIN is the high voltage input.
V OUT is the desired output voltage.
f SW is the controller switching frequency (300 kHz, 600 kHz,
and 1.0 MHz).
When selecting the inductor, choose an inductor saturation rating
that is above the peak current level and then calculate the
voltage during steady state. For a ripple error of 1.0%, the output
capacitor value needed to achieve this tolerance can be determined
using the following equation. (Note that an accuracy of 1.0% is
only possible during steady state conditions, not during load
transients.)
Δ V RR = (0.01) × V OUT
OUTPUT CAPACITOR SELECTION
The primary objective of the output capacitor is to facilitate
the reduction of the output voltage ripple; however, the output
capacitor also assists in the output voltage recovery during load
transient events. For a given load current step, the output voltage
ripple generated during this step event is inversely proportional
to the value chosen for the output capacitor. The speed at which
the output voltage settles during this recovery period depends
52
50
48
46
44
42
40
38
36
34
32
30
28
26
ΔI = 50%
ΔI = 40%
ΔI = 33%
on where the crossover frequency (loop bandwidth) is set. This
crossover frequency is determined by the output capacitor, the
equivalent series resistance (ESR) of the capacitor, and the
compensation network.
To calculate the small signal voltage ripple (output ripple
voltage) at the steady state operating point, use the following
equation:
C OUT = ? I L × ? ?
1
?
24
22
20
18
16
?
?
?
8 × f SW × [ ? V RIPPLE ? ( ? I L × ESR ) ] ? ?
14
12
10
8
6
8
10
12
14
16
18
20
22
24
26
28
30
where ESR is the equivalent series resistance of the output
capacitors.
VALLEY CURRENT LIMIT (A)
To calculate the output load step, use the following equation:
Figure 78. Peak Current vs. Valley Current Threshold for
33%, 40%, and 50% of Inductor Ripple Current
C OUT = 2 ×
f SW
? I LOAD
× ( ? V DROOP ? ( ? I LOAD × ESR ))
where Δ V DROOP is the amount that V OUT is allowed to deviate for
a given positive load current step (ΔI LOAD ).
Rev. B | Page 23 of 40
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