Coiltronics® Transformer Features:
1. Supply high voltage.
The operating frequency of the system is determined by the inductance of
the primary and the bulk capacitor across the primary at resonance.
2. Operation frequency range from 40 to 80kHz.
3. Deliver output power from 2.5 to 14 watts.
4. Slim or low profile type easily built into your design.
5. Available in through-hole and SMT recess or gull wing type.
6. Operate in Royer and direct IC drive.
1
FRes
=
2 ×π LPri ×CBulk
Fres = Resonance Frequency
Determine the ballast capacitor value using the equation below.
7. 1500 volt primary to secondary isolation.
8. Ferrite core material.
Ilamp
9. Designed for floating and non-floating applications.
Cballast
=
2
2 ×π × Fres (Vrun −Vsec )
10. Transformer secondary is machine wound on sections to increase
leakage inductance and reduce voltage gradient between layers.
Layout and Circuit Considerations
•The high voltage traces must be separated from low voltage traces.
V
V
I
= Transformer secondary voltage
= Lamp running voltage
= Lamp current
sec
•The ballast capacitor must be placed closer to the transformer secondary
pin.
run
lamp
•Avoid long wire connections from the transformer to the lamp. Stray
capacitance between wire and ground will reduce efficiency.
F
= Resonance frequency
= Ballast capacitor
res
•Incorporate open lamp and overload protection in the circuit design. Open
lamp will cause full voltage in the transformer output and will burn the
transformer. Most of the CCFL IC has protection built in the circuit for
open and overload condition.
C
ballast
The capacitor voltage is 90 degrees out of phase with the lamp running
voltage.
From this equation, determine the value of the ballast capacitor.
Schematic Relation to Part Number
Schematic A
CTX110652-R
CTX210652-R
Schematic B
CTX110655-R
CTX110657-R
CTX110659-R
CTX210655-R
CTX210657-R
CTX210659-R
Schematic C
Schematic D
CTX110600-R
CTX210600-R
Schematic E
CTX410805-R
CTX410807-R
CTX410809-R
CTX210403-R CTX110603-R
CTX210407-R CTX110605-R
CTX210409-R CTX110607-R
CTX210411-R CTX110609-R
CTX310403-R CTX110611-R
CTX310405-R CTX210603-R
CTX310407-R CTX210605-R
CTX310409-R CTX210607-R
CTX310411-R CTX210609-R
CTX210611-R
COOPER [ COOPER BUSSMANN, INC. ]
