Cirrus-logic CRD1615-8W Manual de usuario descargar pdf (Pagina 14)

CRD1615-8W

14 DS1002RD3

7. TRANSFORMER CONSTRUCTION

The CRD1615-8W 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 CRD1615-8W.

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 12 and 7.

Parameter Condition Symbol Min Typ Max Unit

Flyback Transformer

Electrical Strength (Note 1)

operate

=50/60Hz

-3.75-kV

RMS

Primary Inductance (Note 2)

resonant

=10kHz, 0.3V at

20°C

2.34 2.6 2.86 mH

Primary Leakage Inductance (Note 2)

resonant

=10kHz, 0.3V at

20°C

--55H

Primary DC Resistance (Note 2)

DCR

=20°C

4.64 5.8 6.96 

Secondary DC Resistance (Note 3)

DCR

=20°C

0.208 0.26 0.312 m

Auxiliary DC Resistance (Note 4)

DCR

=20°C

0.44 0.55 0.66 m

91T

#34 AWG

(0.15mm)

105T

# 34AWG

(0.15mm)

34T

# 31AWG

(0.23mm)

Primary

Auxiliary

Secondary

34T

#28AWG

(0.30mm)

Figure 10. Flyback Transformer Schematic

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 20 21 22

CRD1615-8W 1
8 Watt Reference Design 1

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Cirrus-logic CRD1615-8W Manual de usuario Pagina 14

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