AT1453
Preliminary Product Information
Photoflash Capacitor Charger for DSC
Application Information
Photoflash Capacitor Charger Charge Time:
The energy stored in the output capacitor is:
C ×V 2
E =
2
The output power required by the flyback converter to charge the capacitor in a period
of time is:
E
t
C ×V 2
2 × t
PCAP
=
=
=VIN × I AVG × D ×η
The approximate charge time for the converter circuit is:
2
COUT ×VOUT
t =
2 ×VIN × I AVG × D ×η
Where:
IPK × D
I AVG = IBAT
=
fs= Switching frequency
D= Maximum Duty Cycle
LPRI= Primary Inductance
η= Efficiency
2
VIN × D
LPRI × fs
IPK
=
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
17
AIMTRON [ AIMTRON TECHNOLOGY ]
