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Cirrus-logic CRD1680-7W Manual de usuario Pagina 17

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CRD1680-7W
DS1017RD3 17
7. INDUCTOR CONSTRUCTION
The CS1680 integrates a continuous conduction mode (CCM) boost converter that provides transformer compati-
bility and dimmer compatibility with a constant output current buck stage. The following sections describe the boost
and buck inductors installed on the CRD1680-7W.
7.1 Boost Inductor
The CS1680 uses an adaptive digital algorithm to control the boost stage and dimmer compatibility operation mode,
which enables flicker-free operation down to 5% output current with leading-edge and trailing-edge dimmers. Boost
inductor L1 is selected to be a standard TAIYO YUDEN power inductor.
7.1.1 Electrical Specifications
Characteristics conditions:
• Operating temperature range: -25 °C to +125 °C (including coil heat)
Notes: 1. Measured across pins 1 and 2
7.2 Buck Inductor
The CS1680 buck stage is a constant current-regulated DC-DC converter capable of delivering the highest possible
efficiency with constant current output while minimizing line frequency ripple. Buck inductor L2 is selected to be a
standard TAIYO YUDEN power inductor.
7.2.1 Electrical Specifications
Characteristics conditions:
• Operating temperature range: -25 °C to +125 °C (including coil heat)
Notes: 1. Measured across pins 1 and 2
Parameter Condition Symbol Value Unit
TAIYO YUDEN Boost Inductor #NRS8040T150MJGJ
Inductance (Note 1)
f
measured
=100kHz
15 (±20%) H
DC Resistance (Note 1)
Maximum
0.065
Saturation Current
Rated Current
2900 mA
Parameter Condition Symbol Value Unit
TAIYO YUDEN Buck Inductor #NR6045T470M
Inductance (Note 1)
f
measured
=100kHz
47 (±20%) H
DC Resistance (Note 1)
t
DCR
=20°C
0.286
Saturation Current
Rated Current
1300 mA
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