S7DB-12B Datasheet, PDF (11/13 Pages) Bel Fuse Inc. – NON-ISOLATED DC/DC CONVERTERS 5V Input / 1.2V - 3.3V Output / 12A

NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V – 3.3V Output / 12A
Output Voltage Set-Point Adjustment
POWER PRODUCTS
BP02S7DB-12B
S7DB-12B250 Trim Resistor Calculation
Rtrim_ down = ( ^3.691 − 6.8)Kohm
Vo −Vo, adj
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=2.509V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
270
240
210
180
150.01
120.01
90.01
60.01
30.01
0.01
2.25 2.27 2.3 2.33 2.35 2.38 2.4 2.42 2.45 2.48 2.5
Adjusted output voltage Vo,adj (V)
Rtrim_ up = ( ^1.728 − 4.64)Kohm
Vo, adj−Vo
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=2.509V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
S7DB-12B180 Trim Resistor Calculation
Rtrim _ down = ( ^3.869 −13.84)Kohm
Vo −Vo, adj
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.808V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
270
240
210
180
150.01
120.01
90.01
60.01
30.01
0.01
2.5 2.52 2.55 2.58 2.6 2.63 2.65 2.67 2.7 2.73 2.75
Adjusted output voltage Vo,adj(V)
270
240
210
180
150.01
120.01
90.01
60.01
30.01
0.01
1.62 1.64 1.66 1.67 1.69 1.71 1.73 1.75 1.76 1.78 1.8
Adjusted output voltage Vo,adj (V)
3.072
Rtrim_ up = (
−10)Kohm
Vo, adj −Vo
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.808V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
270
240
210
180
150.01
120.01
90.01
60.01
30.01
0.01
1.8 1.82 1.84 1.85 1.87 1.89 1.91 1.93 1.94 1.96 1.98
Adjusted output voltage Vo,adj(V)
©2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel [phone] • Fax [phone] • www.belfuse.com
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