Cirrus Logic CDB1611-8W - Manual (Page 13)

CDB1611-8W
DS978DB4 13
6.2 Flyback Transformer
The flyback transformer stage is a quasi-resonant peak current-regulated DC-DC converter capable of delivering
the highest possible efficiency with constant current output while minimizing line frequency ripple. The auxiliary wind-
ing is used for zero-current detection and overvoltage protection.
Figure 8. Flyback Transformer Schematic
6.2.1 Electrical Specifications
Characteristics conditions:
• Operating temperature range: -25 °C to +120 °C (including coil heat)
Notes: 9. Time = 2sec.
10. Measured across pins 3 and 4.
11. Measured across pins B and A.
12. Measured across pins 2 and 1.
Parameter Condition Symbol Min Typ Max Unit
Flyback Transformer
Electrical Strength
(Note 9) f
operate
=50/60Hz - 4K - V
RMS
Primary Inductance (Note 10) f
resonant
=10kHz, 0.3V at 20°C L
P
13.05 14.5 15.95 mH
Primary Leakage Inductance (Note 10) f
resonant
=10kHz, 0.3V at 20°C L
K
- 106 - H
Primary DC Resistance (Note 10) t
DCR
=20°C 5.25 7.0 8.75 
Secondary DC Resistance (Note 11) t
DCR
=20°C - 120 - m 
Auxiliary DC Resistance (Note 12) t
DCR
=20°C - 400 - m 
113T
#36 AWG
(0.13 mm)
67 T
# 36AWG
(0.13mm)
10 T
# 36AWG
(0.13mm)
Primary
4
5
3
1
Auxiliary
2
Secondary
10T
#27AWG
(0.35mm)
B
A