S111-0320XYZ-BB Datasheet, PDF (7/9 Pages) C&D Technologies – DC/DC Converter 3.3V input, 0.8 to 2.5V output, 10A; 5V input, 1.0 to 3.3V output, 10A

Resistor Trim Equations
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Programmable, Single Output, 1.1V - 1.85Vout @ 60A
3.3V input, 0.8 to 2.5V output, 10A; 5V input, 1.0 to 3.3V output, 10A
NOTE:
For best results, the trim ming range should not exceed +/-20% of the initial
output voltage set by the factory (Vset). To trim down to 0.6V, units with an
initial output voltage of up to 1.2V can be used.
• Trim m ing UP— raising the output voltage using a resistor from Trim to G round.
3.3Vin
Rtrim
=
1992
(Vout − Vset )
5Vin
Rtrim
= −500
×
(1 + Vset
(Vset −
− Vout
Vout )
)
Vout_max = 2.5V
Vout_max = Vset + 1 as Rtrim
approaches 0Ω.
• Trim m ing DOW N— lowering the output voltage using a resistor from Trim to an
external voltage reference or to the Vout pins.
3.3Vin
Rtrim
= 498
×
(4 − 5
(Vout
×
−
Vref
Vset
)
)
5Vin
Rtrim
=
− 500
×
(−
1
− Vset +
(− Vset
Vout +
+ Vout
Vref
)
)
Vout_min = 0.5V
Vout_min = Vset – (Vref –1) as Rtrim
approaches 0Ω.
W here:
Vout is the desired output voltage.
Vset is the output voltage setpoint (output voltage without trim ).
Vref is the reference voltage for the trim resistor when trim ming down. If using Vout
for this purpose, then Vref = Vout.
Rtrim is the resistance value of the trim resistor (ohm s).
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S111_084-S111-00_RevG_Jan18-2005.fm
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