Cirrus Logic CRD1610-8W - Manual (Page 14)

CRD1610-8W
14 DS974RD5
7. INDUCTOR CONSTRUCTION
The CRD1610-8W includes a critical conduction mode (CRM) boost converter that provides power factor correction
and dimmer compatibility with a constant output current, quasi-resonant flyback stage. The following sections de-
scribe the boost and flyback inductors installed on the CRD1610-8W.
7.1 Boost Inductor
The CS1610 uses an adaptive dimmer compatibility algorithm to control the boost inductor stage, which guarantees
dimmer compatibility operation plus enables flicker-free operation with leading-edge, trailing-edge, and digital dim-
mers. The boost auxiliary winding is used for zero-current detection (ZCD) and supplies power to the CS1610.
Figure 10. Boost Inductor Schematic
7.1.1 Electrical Specifications
Characteristics conditions:
• Operating temperature range: -25 °C to +120 °C (including coil heat)
Notes: 6. Measured across pins 1 and 2.
7. Measured across pins 5 and 4.
Parameter Condition Symbol Min Typ Max Unit
Boost Inductor
Primary Inductance
(Note 6) f
resonant
=10kHz, 0.3V at 20°C L
P
1.305 1.45 1.595 mH
Primary DC Resistance (Note 6) t
DCR
=20°C 3.28 4.1 4.92 
Auxiliary DC Resistance (Note 7) 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