SLAN-03D2A0 Datasheet, PDF (18/25 Pages) Bel Fuse Inc. – NON-ISOLATED DC/DC CONVERTERS

NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /3 A Outputs
Mar. 16, 2012
Tunable Loop^TM(continued)
Table 3
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Vo
5V
3.3V 2.5V 1.8V 1.2V 0.6V
Co
RTUNE
CTUNE
V
1x47F
1x47F
2x47F
1x330F 1x330F 2x330F
Polymer Polymer Polymer
270
1500pF
68mV
220
1800pF
60mV
180
3300pF
37mV
180
8200pF
18mV
180
8200pF
18mV
180
33nF
10mV
Recommended values of R_TUNE and C_TUNE to obtain transient deviation of 2% of Vout for a 1.5A step load with
Vin=12V.
Note: The capacitors used in the Tunable Loop tables are 47 μF/3 mΩ ESR ceramic and 330 μF/12 mΩ ESR
polymer capacitors.
Thermal Consideration
Power modules operate in a variety of thermal environments; however, sufficient cooling should always be
provided to help ensure reliable operation.
Considerations include ambient temperature, airflow, module power dissipation, and the need for increased
reliability. A reduction in the operating temperature of the module will result in an increase in reliability. The
thermal data presented here is based on physical measurements taken in a wind tunnel. The test set-up is
shown in Figure 46. The preferred airflow direction for the module is in Figure 47.
Figure 46
Wind Tunnel
25.4_
(1.0)
PWBs
Power Module
76.2_
(3.0)
x
12.7_
(0.50)
Air
flow
Probe Location
for measuring
airflow and
ambient
temperature
Thermal Test Setup
The thermal reference points, T_ref used in the specifications are also shown in Figure 47. For reliable operation
the temperatures at these points should not exceed 120^oC. The output power of the module should not exceed
the rated power of the module (Vo,set x Io,max).
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel [phone]  Fax [phone]  www.belfuse.com
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