XRSB-50T03C Datasheet, PDF (7/15 Pages) Bel Fuse Inc. – ISOLATED DC/DC CONVERTERS

ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input,
3.3 Vdc/15 A Output
Jul. 09, 2010
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Output Trim Equations
Equations for calculating the trim resistor are shown below. The Trim Down resistor should be connected
between the Trim pin and GND pin. The Trim Up resistor should be connected between the Trim pin and the
Vout pin. Only one of the resistors should be used for any given application.
Minimum trim down voltage is 2.97V
Maximum trim up voltage is 3.63V.
The total voltage increased by trim and remote sense should not exceed 10% of the nominal output voltage.
Rtrimdown = ⁵¹¹ −10.22[kΩ]
delta
Vout
Module Trim
Rtrimdown
GND
Rtrimup = ^{(100 + delta) ⋅Vo ⋅5.11− 626} −10.22[kΩ]
1.225⋅ delta
Note:
delta = ^{(Vo _ req − Vo)} ×100 [%]
Vo
Vo_req=Desired (trimmed) output voltage [V]
Output voltage Vo=3.308 V
Vout
Module Trim
Rtrimup
GND
300
270
240
210
180
150
120
90
60
30
0
2.64 2.71 2.77 2.84 2.9 2.97 3.04 3.1 3.17 3.23 3.3
Adjusted output voltage Vo,adj (V)
1500
1350
1200
1050
900
750
600
450
300
150
0
3.3 3.33 3.37 3.4 3.43 3.46 3.5 3.53 3.56 3.6 3.63
Adjusted output voltage Vo,adj(V)
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel [phone] • Fax [phone] • www.belfuse.com
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