Cirrus-logic CRD1616-8W Manual de usuario descargar pdf (Pagina 14)

CRD1616-8W

14 DS1003RD4

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.

7.1.1 Electrical Specifications

Characteristics conditions:

• Operating temperature range: -25 °C to +120 °C (including coil heat)

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.

Parameter Condition Sym Min Typ Max Unit

Flyback Transformer

Electrical Strength (Note 1)

operate

=50/60Hz

- 1200 - V

RMS

Primary Inductance (Note 2)

resonant

=10kHz, 0.3V at

20°C

3.6 4.0 4.4 mH

Primary Leakage Inductance (Note 2)

resonant

=10kHz, 0.3V at

20°C

--80H

Primary DC Resistance (Note 2)

DCR

=20°C

8.8 11 13.2 

Secondary DC Resistance (Note 3)

DCR

=20°C

- - 0.372 

Auxiliary DC Resistance (Note 4)

DCR

=20°C

0.304 0.38 0.456 

99.5T

#37AWG

(0.12mm)

140.5 T

#37 AWG

(0.12 mm)

25T

#31AWG

(0.226mm)

Primary

Auxiliary

Secondary

32T

#30AWG

(0.25mm)

Figure 10. Flyback Transformer Schematic

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 22 23

CRD1616-8W 1
8 Watt Reference Design 1

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