Cirrus Logic CDB1610A-8W - Manual (Page 13)

CDB1610A-8W
DS1011DB3 13
6.2 Flyback Transformer
The flyback transformer stage is a quasi-resonant current-regulated DC-DC converter capable of delivering the high-
est possible efficiency at a constant current while minimizing line frequency ripple. The auxiliary winding is used for
zero-current detection and overvoltage protection.
6.2.1 Electrical Specifications
Characteristics conditions:
• Operating temperature range: -25 °C to +120 °C (including coil heat)
Notes: 3. Time = 2 s.
4. Measured across pins 3 and 4
5. Measured across pins B and A
6. Measured across pins 2 and 1
Parameter Condition Sym Min Typ Max Unit
Flyback Transformer
Electrical Strength
(Note 3) f
operate
=50/60Hz - 4K - V
RMS
Primary Inductance (Note 4) f
resonant
=10kHz, 0.3V at 20°C L
P
2.79 3.1 3.41 mH
Primary Leakage Inductance (Note 4) f
resonant
=10kHz, 0.3V at 20°C L
K
- - 15 H
Primary DC Resistance (Note 4) t
DCR
=20°C 2.175 2.90 3.625 
Secondary DC Resistance (Note 5) t
DCR
=20°C - - 0.22 
Auxiliary DC Resistance (Note 6) t
DCR
=20°C 0.3975 0.53 0.6625 
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
Figure 8. Flyback Transformer Schematic