EPR-21 datasheet(14/32 Pages) POWERINT

14 / 32 page

EPR-21 – 5 V, 30 W DC-DC Converter

19-Nov-02

9 PIXls Design Spreadsheet

DCDC_DPAFwd_rev1.02_061802

Inc. 2002

INPUT

INFO

OUTPUT

UNIT

DPA_061802_R102xls: DPA-Switch

Forward Transformer Design

Spreadsheet

OUTPUT VOLTAGE AND CURRENT

EP21 DC-DC Converter

VMAIN

Volts

Main output voltage

IMAIN

Amps

Main output current

VOUT2

Volts

Output2 voltage

IOUT2

Amps

Output2 current

POUT

30 Watts

Total output power

VBIAS

12.0

Volts

DC bias voltage from output inductor

winding

INPUT VOLTAGE AND UV/OV

VMIN

DC volts

Minimum DC input voltage

VMAX

DC volts

Maximum DC input voltage

min

max

VUV OFF

30.0

33.1 DC volts

Minimum undervoltage On-Off

threshold

VUV ON

32.2

34.6 DC volts

Maximum undervoltage Off-On

threshold (turn-on)

VOV ON

74.8

- DC volts

Minimum overvoltage Off-On threshold

VOV OFF

94.6 DC Volts

Maximum overvoltage On-Off threshold

(turn-off)

618.0 kOhm

Line Sense resistor value (L-pin) - goal

seek (VUV OFF) for std 1% resistor

series

ENTER DPA-Switch VARIABLES

DPA-Switch

dpa424

16VDC

36VDC

Chosen Device

DPA424

Power 15.5 W

35W

ILIMIT

2.32

2.68

Amps

From DPA-Switch datasheet

Frequency - (F)=400kHz,

(L)=300kHz

Full (F) frequency option - 400 kHz

375000

425000

400000

Hertz

From DPA-Switch datasheet

External limit reduction factor (KI=1.0

for default ILIMIT, KI <1.0 for lower

ILIMIT)

ILIMITEXT

2.32 Amps

External current limit

- kOhm

Current Limit resistor value (X-pin) -

assumes minimum datasheet curve (fig

32)

DUVON GOAL

0.71

Maximum allowed duty cycle at VUV

ON MIN undervoltage threshold

KDI

0.15

Maximum current ripple factor

VDS

2 Volts

DPA-Switch average on-state Drain to

Source Voltage

VDSOP

178.7 Volts

Required drain voltage for guaranteed

transformer reset

DIODE Vf SELECTION

VDMAIN

0.5 Volts

Main output diodes forward voltage

drop

VDOUT2

0.5 Volts

Secondary output diodes forward

Page 14 of 32

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