D

AT

TIIN

NG

G

C

UR

RV

VE

ES

S

-20

0

20

40

60

80

100

120

Output Power (Watts)

TEMPERATURE

C

MODEL 2100 - 20W, 5VDC

0.57 Watt/ °C

25

20

15

10

5

0

-20

0

20

40

60

80

100

120

Output Power (Watts)

TEMPERATURE

MODEL 2100 - All other models

25

20

15

10

5

0

0.45 Watt/ °C

>> B-171

Notes:

1. The derating curves shown for the 2100 series represents ambient operating conditions. They assume that good thermal design

practices are being used, including sufficient space in the vicinity of the converter for good air circulation. There are cetain alternate

techniques that can be utilized when the ambient temperature reaches the upper limit of a particular model:

a. Using a heat sink.

b. Mounting the converter on a metal plate which acts as a heat sink.

c. Cooling by forced air.

Any of the above methods (or a combination of heat sinking and forced air) will increase the operating range of the converter up to

under any conditions.

2. External Synchronizing - All models in the 2100 series (packaged in the standard “A” case) can be synchronized to an external clock

by driving the SYNC pin (pin 2) directly with open collector-open drain (1 TTL load). The driving signal frequency must be 220kHz, +/-

5% (20% low, 80% high duty cycle.

3. Although all models feature internal short circuit protection, it is recommended that their inputs be protected externally with a fuse.

The fuse used must be a Slow-Blow type. Recommended rates are shown in the far right column of the model selection guide.

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