ADP1034ACPZ-1-R7 datasheet(36/41 Pages) AD

36 / 41 page

Data Sheet

ADP1034

APPLICATIONS INFORMATION

analog.com

Rev. 0 | 36 of 41

VOUT2 and the inverting regulator that drives VOUT3. Determine the

maximum output power capability by

PVOUT1 (MAX) = 0.5 × (IPEAK2 − (IPEAK − IAC/2)2) × LPRI × fSW × η

where:

PVOUT1 (MAX) is the maximum output power from VOUT1.

IPEAK is the peak current on the flyback switch.

IAC is the ripple current through the primary side of the transformer

and flyback switch.

LPRI is the primary side inductance of the transformer.

fSW is the switching frequency of the flyback regulator.

η is the expected efficiency of the flyback regulator.

The lower limit of the flyback current-limit threshold, ILIM (FLYBACK),

limits the maximum IPEAK. However, it is not recommended to

operate at this level to avoid unwanted current-limit events due

to variation in transformer inductance, efficiency, flyback switching

frequency, and rectifier diode forward voltage drop. If the load

on the flyback causes the current limit to trip, the output voltage

may not regulate as expected. Choose a peak operating current

with built in margin for the variations mentioned or to calculate

the maximum output power or output load using the worst case

transformer inductance, efficiency, diode forward voltage drop, and

flyback switching frequency.

Calculate the maximum load current on VOUT1 by

IVOUT1 (MAX) = PVOUT1 (MAX)/VOUT1

where:

IVOUT1 (MAX) is the maximum output current from VOUT1.

PVOUT1 (MAX) is the maximum output power from VOUT1.

VOUT1 is the output voltage of the flyback regulator.

Table 19. Transformer Selection

Part Number

Manufacturer

Turn

Ratio1

Primary

Saturation

Current2 (mA)

Maximum Leakage

Inductance (µH)

Isolation

Voltage3

(V rms)

Size: Length ×

Width × Height (mm)

Inductance (µH) Resistance (Ω)

ZA9644-AED

Coilcraft

1:1

470

1.8

490

3.8

2000

10.92 × 9.25 × 10

750317986R6A

Würth Elektronik

1:1

470

1.27

480

7.0

1500

10.8 × 13.35 × 9.76

ZA9384-AL

Coilcraft

1:1

470

1.1

800

4.0

2000

15.3 × 16.5 × 6.7

750318257R6A

Würth Elektronik

1:1

470

1.56

550

2.0

1500

16 × 16.8 × 7.62

750316743

Würth Elektronik

1:1

280

1.1

250

0.7

2000

8.26 × 8.6 × 9.65

1 Turn ratio between the primary and secondary coils.

2 20% drop from initial.

3 1 minute duration. Basic insulation.

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