ADP1031ACPZ-1-R7 datasheet(33/38 Pages) AD

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Data Sheet

ADP1031

Rev. A | Page 33 of 38

BUCK REGULATOR COMPONENTS SELECTION

Inductor

The value of the inductor for the ADP1031 buck regulator

affects the efficiency and the output voltage ripple. Larger value

inductors typically improve efficiency. However, for a given

package size, as load increases, the dc resistance (DCR) and core

losses eventually have an increasing negative impact on efficiency.

Using a smaller value inductor reduces output voltage ripple but

can decrease the overall efficiency due to increased switching

losses.

Output Capacitor

The output capacitor selection affects the output ripple voltage,

load step transient, and the loop stability of the regulator. A 4.7 µF

capacitor is recommended as a balance between performance and

size, but a larger capacitor can be used to reduce output ripple.

INVERTING REGULATOR COMPONENT SELECTION

Inductor

The value of the inductor for the ADP1031 inverting regulator

affects the efficiency and output voltage ripple. Larger value

inductors typically improve efficiency. However, for a given

package size, as load increases, the DCR and core losses

eventually have an increasing negative impact on efficiency. Using

a smaller value inductor reduces output voltage ripple but can

decrease the overall efficiency due to increased switching losses.

Output Capacitor

The output capacitor selection affects the output ripple voltage,

load step transient, and the loop stability of the regulator. A

minimum of 4.7 µF capacitor is recommended to maintain

stability across VOUT1 and output load.

Inverting Regulator Stability

The ADP1031 inverting regulator uses internal compensation

and operates with an inductance of 100 µH and a typical

capacitance of 4.7 µF. Using different component values may

result in instability of VOUT3, particularly if lower capacitance

and smaller inductor values are used. Consult the factory for

guidance. Operating the inverter with the recommended inductor

and output capacitor, the output is stable from no load to a

15 mA load for any output from −24 V to −5 V. When

increasing the load beyond 15 mA, it is recommended to use a

larger output capacitor to stabilize the feedback loop,

particularly for lower output voltages.

Table 16. Transformer Selection

Primary

Part Number

Manufacturer

Turns

Ratio1

Inductance

(µH)

Resistance

(Ω)

Saturation

Current2

(mA)

Isolation

Voltage3

(V rms)

Isolation

Type

Size, Length ×

Width × Height,

(mm)

750316743

Würth Elektronik

1:1

280

1.1

250

2000

Basic

8.26 × 8.6 × 9.65

750316566

Würth Elektronik

1:1

150

1.65

220

2000

Basic

7.0 × 6.91 × 7.8

WA8478-BE

Coilcraft

1:1

275

1.2

150

2250

Basic

7.25 × 7.85 × 7.0

YA9293-AL

Coilcraft

1:1

300

1.15

250

2250

Reinforced

10 × 12.07 × 5.97

BS64042CS

Bourns

1:1

270

1.4

400

2200

Basic

10.5 × 9.8 × 11.0

LPD5030-154MRB

Coilcraft

1:1

150

2.43

430

Not

applicable

Functional

4.8 × 4.8 × 2.9

Turns ratio between the primary and secondary coils.

20% drop from initial.

1 minute duration.

Table 17. Buck Regulator and Inverting Regulator Recommended Inductors

Part Number

Manufacturer

Inductance (µH)

DC Resistance (Ω)

Saturation Current1 (mA)

Size, Length ×Width ×

Height, (mm)

744043101

Würth Elektronik

100

0.55

290

4.8 × 4.8 × 2.8

XFL3012-104MEB

Coilcraft

100

2.63

280

3.2 × 3.2 × 1.3

LQH3NPN101MMEL

Murata

100

1.59

260

3 × 3 × 1.4

SRN3015-101M

Bourns

100

2.92

270

3 × 3 × 1.5

SRU2016-101Y

Bourns

100

4.9

150

2.8 × 2.8 × 1.65

XFL2006-104MEB

Coilcraft

100

11.1

115

2 × 2 × 0.6

30% drop in inductance.

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