CRD1616-8W-Z View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
'CRD1616-8W-Z' PDF : 23 Pages View PDF
CRD1616-8W
7. INDUCTOR CONSTRUCTION
The CRD1616-8W provides power factor correction and dimmer compatibility with a constant output current, quasi-
resonant flyback stage. The following sections describe the flyback transformer installed on the CRD1616-8W.
7.1 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.
4
Primary 8
5
99.5T
# 37AWG
(0.12mm)
140.5 T
#37 AWG
(0.12 mm)
A
32T
#30AWG
( 0.25mm)
Secondary
B
7
25T
#31AWG
( 0.226mm)
Auxiliary
6
Figure 10. Flyback Transformer Schematic
7.1.1 Electrical Specifications
Characteristics conditions:
• Operating temperature range: -25 °C to +120 °C (including coil heat)
Parameter
Condition
Flyback Transformer
Electrical Strength
Primary Inductance
Primary Leakage Inductance
Primary DC Resistance
Secondary DC Resistance
Auxiliary DC Resistance
(Note 1)
(Note 2)
(Note 2)
(Note 2)
(Note 3)
(Note 4)
foperate= 50/60 Hz
fresonant=10kHz, 0.3V at 20°C
fresonant=10kHz, 0.3V at 20°C
tDCR = 20 °C
tDCR = 20 °C
tDCR = 20 °C
Notes:
1. Time = 2sec.
2. Measured across pins 4 and 5.
3. Measured across pins B and A.
4. Measured across pins 6 and 7.
Sym
LP
LK
Min
-
3.6
-
8.8
-
0.304
Typ
1200
4.0
-
11
-
0.38
Max Unit
-
4.4
80
13.2
0.372
0.456
VRMS
mH
H
14
DS1003RD4
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