DF04M View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

DF04M

OFFLINE FLYBACK CONVERTERS DESIGN METHODOLOGY WITH THE L6590 FAMILY

STMicroelectronics 

AN1262 APPLICATION NOTE

Table 23. Test Board design calculations results.

a) Preliminary Calculations results (step 1)

Symbol

Parameter

Pin

Converter Input Power

Iout

DC Output Current

VPKmin

Minimum Peak Input Voltage

VPKmax

Maximum Peak Input Voltage

b) Preliminary Calculations results (step 2)

Vinmin

Absolute minimum Input DC Voltage

VDCmin

Minimum Input DC bus Voltage

PinT

Transformer Input Power

VDS(on)x

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

state

Dx

Maximum Duty Cycle

VDSmax

Maximum drain Voltage in OFF-state

Ippkx

Max. Peak Primary Current

c) Operating Conditions @ Vin = VDCmin

VDS(on)

Average drop on RDS(on) in ON-state

D

Duty Cycle (switch ON-time to switch-

ing period ratio)

Ippk

Peak Primary Current

IpDC

DC Primary Current

IpRMS

Total RMS Primary Current

IpAC

RMS Primary Current (AC component

only)

D’

Secondary diode conduction time to

switching period ratio

Ispk

Peak Secondary Current

IsDC

DC Secondary Current

IsRMS

Total RMS Secondary Current

IsAC

RMS Secondary Current (AC compo-

nent only)

d) Device power dissipation @ Vin = VDCmin

Pcond

Conduction losses

Psw

Switching losses

Pcap

Capacitive losses

Pq

Quiescent losses

Ptot

Total losses

Rthj-amb

Maximum junction-ambient thermal

resistance

Value

13.33 W

2A

121.5 V

373.4 V

84.9 V

103.2 V

12.44 W

7.24 V

0.607

573.4 V

0.528 A

7.24 V

0.496

0.528 A

0.131 A

0.215 A

0.170 A

0.397

10.08 A

2A

3.67 A

3.08 A

1.29 W

0.13 W

0.16 W

0.08 W

1.66 W

51.2 °C/W

35/42

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