XRSB-50T Datasheet, PDF (5/13 Pages) Bel Fuse Inc. – ISOLATED DC/DC CONVERTERS

ISOLATED DC/DC CONVERTERS
48 Vdc Input 1.2 Vdc - 12 Vdc / 25 A - 5 A Outputs, 1/16 Brick
Output Trim Equations
Equations for calculating the trim resistor are shown below (Unit: kΩ). The Trim Down resistor should be
connected between the Trim pin and Ground pin. The Trim Up resistor should be connected between the Trim pin
and the Vout. Only one of the resistors should be used for any given application.
1) Trim Equations for Vo=1.2 V
R_trimdown
=
511
delta
− 10.22
R_trimup
=
(100
+
delta) ⋅Vo ⋅ 5.11 −
0.6125 ⋅ delta
313
− 10.22
Note:
delta = ^{(Vo _ req − Vo)} ×100[%]
Vo
Vo_req=Desired (trimmed) output voltage [V] Vo=1.202 V
Vout
Module Trim
Rtrimdown
GND
Vout
Module Trim
Rtrimup
GND
2) Trim Equations for Vo=1.5 V - 12 V
R_trimdown
=
511
delta
− 10.22
R_trimup
=
(100 + delta) ⋅Vo ⋅ 511−
1.225⋅ delta
626
− 10.22
Note:
delta = ^{(Vo _ req −Vo )} ×100[%]
Vo
Vo_req=Desired (trimmed) output voltage [V]
Vo=1.503 V for 1.5 V output; Vo=1.804 V for 1.8 V output; Vo=2.505 V for 2.5 V output; Vo=3.308 V for 3.3 V
output; Vo=5.002 V for 5 V output; Vo=12.007 V for 12 V output.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel [phone] • Fax [phone] • www.belfuse.com