SLIN-20E1A0 BEL [Bel Fuse Inc.], SLIN-20E1A0 Datasheet - Page 16

• Manufacturer Part Number: SLIN-20E1A0
• Description: NON-ISOLATED DC/DC CONVERTERS 4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
• Manufacturer: BEL [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 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
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.
October 8, 2009
Rtrim
NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
=
⎡
⎢
⎣
(
V
Vo
O, set
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel [phone] • Fax [phone] •
0.7
1.0
1.2
1.5
1.8
2.5
3.3
5.0
Circuit configuration for programming output voltage using an external resistor
6
−
(V)
9 .
. 0
69
)
Rtrim (KΩ)
⎤
⎥
⎦
k
22.26
13.53
8.519
6.216
3.812
2.644
1.601
690
Ω
V
ON/OFF
IN
(+)
GND
TRIM
V
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
VS+
O
(+)
R
tri m
LOAD
www.belfuse.com
16