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DR73-100-R Fiches technique(PDF) 22 Page - Analog Devices

No de pièce DR73-100-R
Description  1.2 A, 20 V, 700 kHz/1.4 MHz, Nonsynchronous Step-Down Regulator
PDF  28 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

DR73-100-R Fiches technique(HTML) 22 Page - Analog Devices

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ADP2300/ADP2301
Rev. 0 | Page 22 of 28
RESISTIVE VOLTAGE DIVIDER SELECTION
To select the appropriate resistive voltage divider, first calculate the
output feedback resistive voltage divider, and then calculate the
resistive voltage divider for the programmable VIN start-up voltage.
The output feedback resistive voltage divider is
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
×
=
2
1
1
V
800
.
0
FB
FB
OUT
R
R
V
For the 3.3 V output voltage, choose RFB1 = 31.6 kΩ and RFB2
= 10.2 kΩ as the feedback resistive voltage divider, according to
the recommended values in Table 11.
The resistive voltage divider for the programmable VIN start-up
voltage is
V
2
.
1
μA
2
.
1
V
2
.
1
1
2
+
×
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
=
EN
EN
STARTUP
R
R
V
If VSTARTUP = 7.8 V, choose REN2 = 10.2 kΩ, and then calculate
REN1, which in this case is 56 kΩ.
VIN = 12V
VIN
BST
SW
FB
EN
GND
ADP2301
(1.4MHz)
R3
56kΩ
1%
R2
10.2kΩ
1%
R1
31.6kΩ
1%
C2
22µF
6.3V
D1
B230A
C3
0.1µF
6.3V
L1
4.7µH
2.0A
VOUT = 3.3V
1.2A
R4
10.2kΩ
1%
C1
10µF
25V
Figure 48. Schematic for the Design Example
Table 11. Recommended External Components for Typical Applications at 1.2 A Output Load
Part Number
VIN (V)
VOUT (V)
IOUT (A)
L (μH)
COUT (μF)
RFB1 (kΩ), ±1%
RFB2 (kΩ), ±1%
ADP2300 (700 kHz)
18
3.3
1.2
10
22
31.6
10.2
18
5.0
1.2
15
22
52.3
10
12
1.2
1.2
6.8
2 × 22
4.99
10
12
1.8
1.2
6.8
2 × 22
12.7
10.2
12
2.5
1.2
10
22
21.5
10.2
12
3.3
1.2
10
22
31.6
10.2
12
5.0
1.2
10
22
52.3
10
9
3.3
1.2
10
22
31.6
10.2
9
5.0
1.2
10
22
52.3
10
5
1.8
1.2
4.7
2 × 22
12.7
10.2
5
2.5
1.2
4.7
22
21.5
10.2
ADP2301 (1.4 MHz)
18
3.3
1.2
4.7
22
31.6
10.2
18
5.0
1.2
6.8
10
52.3
10
12
2.5
1.2
4.7
22
21.5
10.2
12
3.3
1.2
4.7
22
31.6
10.2
12
5.0
1.2
4.7
10
52.3
10
9
3.3
1.2
4.7
22
31.6
10.2
9
5.0
1.2
4.7
10
52.3
10
5
1.8
1.2
2.2
2 × 22
12.7
10.2
5
2.5
1.2
2.2
22
21.5
10.2



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