DER-96 datasheet(12/33 Pages) POWERINT

12 / 33 page

DER-96

10 W VoIP

September 12, 2005

Page 12 of 33

CONFIDENTIAL

Power Integrations

Tel: +1 408 414 9200 Fax: +1 408 414 9201

www.powerint.com

Transformer Design Spreadsheet

DCDC_DPASwitch_

061704; Rev.1.11;

Integrations Inc.

2004

INPUT

INFO

OUTPUT

UNITS

DPASwitch_Flyback_061704 - Continuous/Discontinuous mode Spreadsheet.

ENTER APPLICATION VARIABLES

App140569 - EFD20 - 010605a

VDCMIN

Volts

Minimum DC Input Voltage

VDCMAX

Volts

Maximum DC Input Voltage

3.3

Volts

Output Voltage

10 Comment

Watts

Verify temperature rise for continuous power. P and G packages may be thermally

limited

n0.8

Efficiency Estimate

0.7

Loss Allocation Factor, (0.7 Recommended)

Volts

Bias Voltage (Recommended between 12V and 18V)

UV AND OV PARAMETERS

min

max

VUVOFF

30.8802 34.06899 Volts

Minimum undervoltage On-Off threshold

VUVON

33.11235 35.66338 Volts

Maximum undervoltage Off-On threshold (turn-on)

VOVON

77.1176 -

Volts

Minimum overvoltage Off-On threshold

VOVOFF

97.52584 Volts

Maximum overvoltage On-Off threshold (turn-off)

637.7573 k-Ohms

ENTER DPASWITCH VARIABLES

DPASWITCH

DPA423P

16VDC

36 VDC

Chosen Device

#N/A

Power Out 6W

13W

ILIMITMAX

#N/A

1.34

Amps

From DPASWITCH Data Sheet

Frequency

Enter 'F' for fS = 400KHz and 'L' for fS = 300KHz

#N/A

Hertz

DPASWITCH Switching Frequency

VOR

38 Volts

Reflected Output Voltage

0.80

0.8

Current Limit Reduction Factor

ILIMITEXT

0.928 Amps

Minimum External Current limit

9.501216 k-Ohms

Resistor from X pin to source to set external current limit

VDS

Volts

DPASWITCH on-state Drain to Source Voltage

0.45

Volts

Output Winding Diode Forward Voltage Drop

VDB

0.7

Volts

Bias Winding Diode Forward Voltage Drop

KRP/KDP

0.40

Ripple to Peak Current Ratio (0.2 < KRP < 1.0 : 1.0< KDP<6.0)

ENTER TRANSFORMER CORE/CONSTRUCTION VARIABLES

Core Type

efd20

Selected Transformer Core

Core Manuf

Bobbin Manuf

Core

EFD20

P/N:

EFD20-3F3-Exxx-xx

Bobbin

EFD20_Bob

P/N:

CPHS-EFD20-1S-10P-T

0.31 cm^2

Core Effective Cross Sectional Area

4.7 cm

Core Effective Path Length

1200 nH/T^2

Ungapped Core Effective Inductance

13.5 mm

Bobbin Physical Winding Width

Safety Margin Width (Half the Primary to Secondary Creepage Distance)

Number of Primary Layers

Number of Secondary Turns

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