CRD1616-8W-Z Просмотр технического описания (PDF) - Cirrus Logic

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CRD1616-8W-Z

8 Watt Reference Design

Cirrus Logic 

CRD1616-8W

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.

4

Primary 8

5

99.5T

# 37AWG

(0.12mm)

140.5 T

#37 AWG

(0.12 mm)

A

32T

#30AWG

( 0.25mm)

Secondary

B

7

25T

#31AWG

( 0.226mm)

Auxiliary

6

Figure 10. Flyback Transformer Schematic

7.1.1 Electrical Specifications

Characteristics conditions:

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

Parameter

Condition

Flyback Transformer

Electrical Strength

Primary Inductance

Primary Leakage Inductance

Primary DC Resistance

Secondary DC Resistance

Auxiliary DC Resistance

(Note 1)

(Note 2)

(Note 2)

(Note 2)

(Note 3)

(Note 4)

foperate= 50/60 Hz

fresonant=10kHz, 0.3V at 20°C

fresonant=10kHz, 0.3V at 20°C

tDCR = 20 °C

tDCR = 20 °C

tDCR = 20 °C

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.

Sym

LP

LK

Min

-

3.6

-

8.8

-

0.304

Typ

1200

4.0

-

11

-

0.38

Max Unit

-

4.4

80

13.2

0.372

0.456

VRMS

mH

H







14

DS1003RD4

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