SLIN-12F2AX Datasheet, PDF (15/25 Pages) Bel Fuse Inc. – 2.4 Vdc - 5.5 Vdc Input, 0.6 Vdc - 3.63 Vdc /12 A Output

NON-ISOLATED DC/DC CONVERTERS
2.4 Vdc - 5.5 Vdc Input, 0.6 Vdc - 3.63 Vdc /12 A Output
December 2, 2010
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Output Voltage Programming
The output voltage of the SLIN-12F2Ax module can be programmed to any voltage from 0.6dc to 3.63Vdc by
connecting a resistor between the Trim and GND pins of the module. Certain restrictions apply on the output
voltage set point depending on the input voltage. These are shown in the Output Voltage vs. Input Voltage Set
Point Area plot in the figure below. The Upper Limit curve shows that the entire output voltage range is available
with the maximum input voltage of 5.5V. The Lower Limit curve shows that for output voltages of 1.8V and
higher, the input voltage needs to be larger than the minimum of 2.4V.
6
5
Upper Limit
4
3
Lower Limit
2
1
0
0.5
1
1.5
2
2.5
3
3.5
4
Output Voltage (V)
Without an external resistor between Trim and GND pins, the output of the module will be 0.6Vdc. To calculate
the value of the trim resistor, Rtrim for a desired output voltage, use the following equation:
Rtrim
=
⎡
⎢⎣
(Vo¹âˆ’^.20.6)^{⎥⎦⎤kΩ}
Rtrim is the external resistor in kΩ
Vo is the desired output voltage.
By using a ±0.5% tolerance trim resistor with a TC of ±25ppm, a set point tolerance of ±1.5% can be achieved as
specified in the electrical specification. Table 1 provides Rtrim values required for some common output
voltages.
Table 1
V_{O, set} (V)
0.6
1.0
1.2
1.5
1.8
2.5
3.3
Rtrim (KΩ)
Open
3.0
2.0
1.333
1.0
0.632
0.444
Circuit configuration for programming output voltage using
an external resistor
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel [phone] • Fax [phone] • www.belfuse.com
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