Cirrus Logic CRD1610A-8W - Manual (Page 14)

CRD1610A-8W
14 DS1012RD3
7. INDUCTOR CONSTRUCTION
The CRD1610A-8W includes a critical conduction mode (CRM) boost converter that provides power factor correc-
tion and dimmer compatibility with a constant output current, quasi-resonant flyback stage. The following sections
describe the boost and flyback inductors installed on the CRD1610A-8W.
7.1 Boost Inductor
The CS1610A uses an adaptive dimmer compatibility algorithm to control the boost inductor stage, which guaran-
tees dimmer compatibility operation plus enables flicker-free operation with leading-edge, trailing-edge, and digital
dimmers. The boost auxiliary winding is used for zero-current detection (ZCD) and supplies power to the CS1610A.
7.1.1 Electrical Specifications
Characteristics conditions:
• Operating temperature range: -25 °C to +120 °C (including coil heat)
Notes: 1. Measured across pins 1 and 2
2. Measured across pins 5 and 4
Parameter Condition Symbol Min Typ Max Unit
Boost Inductor
Primary Inductance (Note 1) f
resonant
=10kHz, 0.3V at 20°C L
P
1.305 1.45 1.595 mH
Primary DC Resistance (Note 1) t
DCR
=20°C 3.28 4.1 4.92 
Auxiliary DC Resistance (Note 2) t
DCR
=20°C 0.456 0.57 0.684 
2
1
5
4
200T
#34AWG
(0.16mm)
22T
#34 AWG
(0.16mm )
Primary
Auxillary
Figure 10. Boost Inductor Schematic