Cirrus Logic CRD1610-8W - Manual (Page 15)

CRD1610-8W
DS974RD5 15
7.2 Flyback Transformer
The flyback transformer stage is a quasi-resonant current-regulated DC-DC Converter capable of delivering the
highest possible efficiency at a constant current while minimizing line frequency ripple. The auxiliary winding is used
for zero-current detection and overvoltage protection.
Figure 11. Flyback Transformer Schematic
7.2.1 Electrical Specifications
Characteristics conditions:
• Operating temperature range: -25 °C to +120 °C (including coil heat)
Notes: 8. Time = 2sec.
9. Measured across pins 3 and 4.
10. Measured across pins B and A.
11. Measured across pins 2 and 1.
Parameter Condition Sym Min Typ Max Unit
Flyback Transformer
Electrical Strength
(Note 8) f
operate
=50/60Hz - 4K - V
RMS
Primary Inductance (Note 9) f
resonant
=10kHz, 0.3V at 20°C L
P
2.79 3.1 3.41 mH
Primary Leakage Inductance (Note 9) f
resonant
=10kHz, 0.3V at 20°C L
K
- - 15 H
Primary DC Resistance (Note 9) t
DCR
=20°C 2.175 2.90 3.625 
Secondary DC Resistance (Note 10) t
DCR
=20°C - - 0.22 
Auxiliary DC Resistance (Note 11) t
DCR
=20°C 0.3975 0.53 0.6625 
36T
# 35AWG
(0.14mm)
52T
#35 AWG
(0.14 mm)
13 T
# 35AWG
(0.14mm)
Primary
4
5
3
1
Auxiliary
2
Secondary
13T
#32AWG
(0.20mm) × 2
B
A