XRSB-40U Datasheet, PDF (5/13 Pages) Bel Fuse Inc. – ISOLATED DC/DC CONVERTERS

ISOLATED DC/DC CONVERTERS
24 Vdc/48 Vdc Input 1.2 Vdc - 12 Vdc / 18 A - 3.5 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
2) Trim Equations for Vo=1.5 V - 12 V
Module
Vo
Trim
GND
Rtrimdown
Module
Vo
Trim
GND
Rtrimup
R_trimdown
=
511
delta
− 10.22
R_trimup
=
(100 + delta) ⋅Vo ⋅ 511− 626
1.225⋅ delta
− 10.22
Note:
delta = ^{(Vo _ req −Vo )} ×100[%]
Vo
Vo_req=Desired (trimmed) output voltage [V]
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel [phone] • Fax [phone] • www.belfuse.com