SLIN-20E1A_10 Datasheet, PDF (16/26 Pages) Bel Fuse Inc. – NON-ISOLATED DC/DC CONVERTERS

NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
December 10, 2010
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Output Trim Equations
Without an external resistor between Trim and GND pins, the output of the module will be 0.69Vdc. To calculate
the value of the trim resistor, Rtrim, for a desired output voltage, use the following equation:
Rtrim
=
⎡
⎢⎣ _(Vo
6_−.09.69_{)⎥⎦⎤kΩ}
Rtrim is the external resistor in kΩ
Vo is the desired output voltage.
Table 1 provides Rtrim values required for some common output voltages.
Table 1
V_{O, set} (V)
0.7
1.0
1.2
1.5
1.8
2.5
3.3
5.0
Rtrim (KΩ)
690
22.26
13.53
8.519
6.216
3.812
2.644
1.601
By using a ±0.5% tolerance trim resistor with a TC of ±100ppm, a set point tolerance of ±1.5% can be achieved
as specified in the electrical specification.
Remote Sense
The SLIN-20E1Ax power modules have a Remote Sense feature to minimize the effects of distribution losses by
regulating the voltage between the S+ and S– pins. The voltage between the S– and GND pins of the module
must not drop below –0.2V. If Remote Sense is being used, the voltage between S+ and S– cannot be more
than 0.5V larger than the voltage between VOUT and GND. Note that the output voltage of the module cannot
exceed the specified maximum value. When the Remote Sense feature is not being used, connect the S+ pin to
the VOUT pin and the S– pin to the GND pin.
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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