DFS06M datasheet(35/42 Pages) STMICROELECTRONICS

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AN1262 APPLICATION NOTE

Table 23. Test Board design calculations results.

a) Preliminary Calculations results (step 1)

Symbol

Parameter

Value

Converter Input Power

13.33 W

Iout

DC Output Current

2 A

VPKmin

Minimum Peak Input Voltage

121.5 V

VPKmax

Maximum Peak Input Voltage

373.4 V

b) Preliminary Calculations results (step 2)

Vinmin

Absolute minimum Input DC Voltage

84.9 V

VDCmin

Minimum Input DC bus Voltage

103.2 V

PinT

Transformer Input Power

12.44 W

VDS(on)x

Max. average drop on RDS(on) in ON-

state

7.24 V

Maximum Duty Cycle

0.607

VDSmax

Maximum drain Voltage in OFF-state

573.4 V

Ippkx

Max. Peak Primary Current

0.528 A

c) Operating Conditions @ Vin = VDCmin

VDS(on)

Average drop on RDS(on) in ON-state

7.24 V

Duty Cycle (switch ON-time to switch-

ing period ratio)

0.496

Ippk

Peak Primary Current

0.528 A

IpDC

DC Primary Current

0.131 A

IpRMS

Total RMS Primary Current

0.215 A

IpAC

RMS Primary Current (AC component

only)

0.170 A

D’

Secondary diode conduction time to

switching period ratio

0.397

Ispk

Peak Secondary Current

10.08 A

IsDC

DC Secondary Current

2 A

IsRMS

Total RMS Secondary Current

3.67 A

IsAC

RMS Secondary Current (AC compo-

nent only)

3.08 A

d) Device power dissipation @ Vin = VDCmin

Pcond

Conduction losses

1.29 W

Psw

Switching losses

0.13 W

Pcap

Capacitive losses

0.16 W

Quiescent losses

0.08 W

Ptot

Total losses

1.66 W

Rthj-amb

Maximum junction-ambient thermal

resistance

51.2 °C/W

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