Cirrus-logic CRD1680-7W Manual do Utilizador descarregar pdf (Página 17)

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)

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)

measured

=100kHz

47 (±20%) H

DC Resistance (Note 1)

DCR

=20°C

0.286 

Saturation Current

Rated Current

1300 mA

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 30 31

CRD1680-7W 1
7 Watt Reference Design 1

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