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A

9/03

DI-59

TDK PC40 EE13, A

2

EE13 Horizontal 8 pin

Core Cancellation: 22T, 34 AWG

Primary: 90T, 36 AWG

Shield: 5T, 3 x 30 AWG

Secondary: 5T, 2 x 30 AWG (TIW)

+ 10T, 30 AWG (TIW)

Core cancellation (2-3, clockwise), tape,

Primary (1-2, clockwise), tape,

Shield (2-open, anti-clockwise), tape,

Secondary (5T: 5-7, anti-clockwise,

10T: 7-6, anti-clockwise)

2.3 mH ± 10%

300 kHz (minimum)

Table 1. Transformer Design Parameters.

Figure 3. No-load Input Power Consumption.

Core

Bobbin

Winding Details

Winding Order

(pin numbers)

Primary

Inductance

Primary Resonant

Frequency

TRANSFORMER PARAMETERS

Figure 2. Load Regulation - CV/CC Characteristics.

60

150 180 210 240

270

120

90

Input Voltage (VAC)

150

100

50

0

200

250

300

350

Typical applications are chargers for cell phones, PDAs,

portable audio devices and shavers or power sources embedded

within home appliances and consumer electronics, such as TV

standby and bias supplies.

Key Design Points

• Set V

• Transformer primary inductance tolerance must be

≤10%,

to maintain CC limit tolerance of

±25%

• If battery (load) voltage is less than 2 V, then the LinkSwitch

will not come out of its auto-restart mode

• To increase the time period allowed for regulation to be

reached at startup (or into a full-power resistive load), C4

must be increased in value to 1

µF

• To lower the ripple voltage into non-battery loads, an LC

filter or LDO must be added onto the output

10

6

8

0

100

400

500

600

Output Current (A)

0

2

4

200

300

Low Limit

High Limit

V

V