Application information

HVLED007

26/33

DS12866 Rev 1

Figure 12. Functional schematic of the soft restart function

4.12

Suggested step-by-step design procedure of a Hi-PF QR

flyback converter based on the HVLED0007

The proposed design procedure can be outlined in fourteen steps, starting from the design

Q

CT

BM

UVLO

S

Q

R

RUN

STOP

RUN

STOP

Table 9. Basic electrical specification and key parameters of a Hi-PF QR flyback

Parameter

Symbol

Line voltage range

Line frequency range

Regulated output voltage

Output overvoltage level

Output current range

Maximum Vout ripple @ 2 fL_min

Expected efficiency at full load (estimated

value)

η

Voltage drop on secondary rectifier

(estimated value)

Reflected voltage

Minimum switching frequency