ADP3026 データシートの表示（PDF） - Analog Devices

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ADP3026

High Efficiency Dual Power Supply Controller

Analog Devices 

ADP3026

VIN

5.5V–25V

C12

4.7µF

R8

4.7Ω

C1

330pF

R1

3.3kΩ

C2 R2

C3

33pF

510pF 175kΩ

C4

33nF

R3

200kΩ

C5

22nF

R4

200kΩ

C6

47nF

1000pF

R5

91kΩ

C8

C7

33pF

R6

1.8kΩ

C9

680pF

U1

ADP3026

1 CS5

BST5 28

2 FB5

DRVH5 27

3 EAN5

SW5 26

4 EAO5

DRVL5 25

5 SS5

PGND 24

6 CLSET5

SD 23

C15C C15D

10µF 10µF

D2

1N4148

C14

100nF

Q5

SI4410

L2

10µH

D6

10BQ040

Q4

SI4410

R10

10kΩ

7 REF

INTVCC 22

8 AGND

9 CLSET3

VIN 21

R9

10Ω

DRVL3 20

10 SS3

SW3 19

C13

4.7µF

C15 C15B

10µF 10µF

11 EAO3

12 EAN3

13 FB3

14 CS3

DRVH3 18

D1

1N4148

BST3 17

CPOR 16

PWRGD 15

C10

47nF

R7

10kΩ

Q2

C11 SI4410

100nF

Q3

SI4410

L1

10µH

D5

10BQ040

D4

10BQ040

C17

100µF

VOUT5

C17B 5V, 4A

100µF

D3

C16

10BQ040 100µF

VOUT3

3.3V, 4A

C16B

100µF

Figure 15. 33 W, Dual-Output DC-DC Converter

Nominal Inductor Value

The inductor guidelines in this data sheet are based on the

assumption that the inductor ripple current is 30% of the

maximum output dc current at the nominal 12 V input voltage.

The inductor ripple current and inductance value are not

critical, but this choice is important in analyzing the trade-offs

between cost, size, efficiency, and volume. The higher the ripple

current, the lower the inductor size and volume. However, this

leads to higher ac losses in the windings. Conversely, a higher

inductance means lower ripple current and smaller output filter

capacitors, but slower transient response.

The inductance should be based on the maximum output

current plus 15% (½ of the 30% ripple allowance) at the

nominal input voltage

L

≥

3 × (V IN(NOM)

− V OUT)×

V

V OUT

IN (NOM) × IOUT

×

f

(6)

Optimum standard inductor values for the three power levels

are shown in Table 6.

Table 6. Standard Inductor Values (200 kHz Frequency)

3.3 V/2A 3.3 V/2A 3.3 V/10A 5 V/2A 5 V/4A 5 V/10A

20 µH 8.2 µH 3.3 µH

22 µH 10 µH 4.7 µH

Inductor Selection

Once the value for the inductor is known, there are two ways to

proceed: design the inductor in-house or buy the closest

inductor that meets the overall design goals.

Standard Inductors

Buying a standard inductor provides the fastest, easiest solution,

and many companies offer suitable power inductor solutions. A

list of power inductor manufacturers is given in Table 7.

Rev. 0 | Page 12 of 20

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