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ADP2387ACPZN-R7 Datasheet(PDF) 17 Page - Analog Devices

Part # ADP2387ACPZN-R7
Description  20 V, 6 A, Synchronous, Step-Down DC-to-DC Regulator
PDF  25 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADP2387ACPZN-R7 Datasheet(HTML) 17 Page - Analog Devices

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Data Sheet
ADP2387
Rev. C | Page 17 of 25
Table 7. Recommended Inductors
Vendor
Part No.
Value (µH)
ISAT (A)
IRMS (A)
DCR (mΩ)
Toko
FDVE0630-R47M
0.47
15.6
14.1
3.7
FDVE0630-R75M
0.75
10.9
10.7
6.2
FDVE0630-1R0M
1.0
9.5
9.5
8.5
FDVE1040-1R5M
1.5
13.7
14.6
4.6
FDVE1040-2R2M
2.2
11.4
11.6
6.8
FDVE1040-3R3M
3.3
9.8
9.0
10.1
FDVE1040-4R7M
4.7
8.2
8.0
13.8
Vishay
IHLP3232DZ-R47M-11
0.47
14
25
2.38
IHLP3232DZ-R68M-11
0.68
14.5
22.2
3.22
IHLP3232DZ-1R0M-11
1.0
12
18.2
4.63
IHLP4040DZ-1R5M-01
1.5
27.5
15
5.8
IHLP4040DZ-2R2M-01
2.2
25.6
12
9
IHLP4040DZ-3R3M-01
3.3
18.6
10
14.4
IHLP4040DZ-4R7M-01
4.7
17
9.5
16.5
Wurth Elektronik
744 325 120
1.2
25
20
1.8
744 325 180
1.8
18
16
3.5
744 325 240
2.4
17
14
4.75
744 325 330
3.3
15
12
5.9
744 325 420
4.2
14
11
7.1
PROGRAMMING INPUT VOLTAGE UVLO
The ADP2387 has a precision enable input that can program
the UVLO threshold of the input voltage (see Figure 32).
EN
EN CMP
ADP2387
1.17V
4µA
1µA
PVIN
RTOP_EN
RBOT_EN
Figure 32. Programming the Input Voltage UVLO
Use the following equations to calculate RTOP_EN and RBOT_EN:
RTOP_EN =
μA
1
V
17
.
1
μA
5
V
07
.
1
V
17
.
1
V
07
.
1
_
_
×
−
×
×
−
×
FALLING
IN
RISING
IN
V
V
RBOT_EN =
V
17
.
1
μA
5
V
17
.
1
_
_
_
−
×
−
×
EN
TOP
RISING
IN
EN
TOP
R
V
R
where:
VIN_RISING is the VIN rising threshold.
VIN_FALLING is the VIN falling threshold.
COMPENSATION DESIGN
For peak current-mode control, simplify the power stage as a
voltage controlled current source supplying current to the output
capacitor and load resistor. It is composed of one domain pole
and a zero that is contributed by the output capacitor ESR. The
control-to-output transfer function is based on the following:
×
π
×
+
×
π
×
+
×
×
=
=
P
Z
VI
COMP
OUT
VD
f
s
f
s
R
A
s
V
s
V
s
G
2
1
2
1
)
(
)
(
)
(
OUT
ESR
z
C
R
f
×
×
π
×
=
2
1
OUT
ESR
p
C
R
R
f
×
+
×
π
×
=
)
(
2
1
where:
AVI = 8.7 A/V.
R is the load resistance.
RESR is the equivalent series resistance of the output capacitor.
COUT is the output capacitance.
A transconductance amplifier is used on the ADP2387 as an
error amplifier and to compensate the system. Figure 33 shows
the simplified, peak current mode control, small signal circuit.



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