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D
ERATING
C
URVES
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MODEL 2100 - 20W, 5VDC
Output Power (Watts)
25
20
15
10
5
0
-20
0
20
40
60
80
100
120
0.57 Watt/ °C
TEMPERATURE
C
MODEL 2100 - All other models
Output Power (Watts)
25
0.45 Watt/ °C
20
15
10
5
0
-20
0
20
40
60
80
100
120
TEMPERATURE
°
C
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
85
o
C maximum ambient temperature. However the baseplate (case) temperature must not exceed 115
o
C for more than one minute
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.
>> B-171
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