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Q48T25033 DC-DC Converter Data Sheet
36-75 VDC Input; 3.3 VDC @ 25A Output
When using remote sense, the output voltage at the con-
verter can be increased by as much as 10% above the
nominal rating in order to maintain the required voltage
across the load. Therefore, the designer must, if necessary,
decrease the maximum current (originally obtained from the
derating curves) by the same percentage to ensure the con-
verter’s actual output power remains at or below the maxi-
mum allowable output power.
R T ? DECR = Required value of trim-down resistor [k ? ]
and ? is as defined above.
Note: The above equations for calculation of trim resistor
values match those typically used in conventional industry-
standard quarter bricks. For more information see Applica-
tion Note 103.
Q Family
Output Voltage Adjust /TRIM (Pin 6)
Vin (+)
TM
Converter
Vout (+)
The converter’s output voltage can be adjusted up 10% or
down 20% relative to the rated output voltage by the addition
of an externally connected resistor. Trim up to 10% is guar-
Vin
ON/OFF
(Top View)
SENSE (+)
TRIM
SENSE (-)
R T-INCR
Rload
anteed only at Vin ≥ 40 V, and it is marginal (8% to 10%) at
Vin = 36 V.
Vin (-)
Vout (-)
The TRIM pin should be left open if trimming is not being
used. To minimize noise pickup, a 0.1 μ F capacitor is con-
nected internally between the TRIM and SENSE(-) pins.
To increase the output voltage, refer to Fig. 4. A trim resistor,
Fig. 4: Configuration for increasing output voltage .
Q Family
R T-INCR , should be connected between the TRIM (Pin 6) and
SENSE(+) (Pin 7), with a value of:
Vin (+)
TM
Converter
(Top View)
Vout (+)
SENSE (+)
R T ? INCR =
5.11(100 + ? )V O ? NOM ? 626
1.225 ?
? 10.22 [k ? ]
Vin
ON/OFF
Vin (-)
TRIM
SENSE (-)
Vout (-)
R T-DECR
Rload
where,
R T ? INCR = Required value of trim-up resistor k ? ]
V O ? NOM = Nominal value of output voltage [V]
Fig. 5: Configuration for decreasing output voltage.
Trimming/sensing beyond 110% of the rated output voltage
? =
(V O -REQ ? V O -NOM )
V O - NOM
X 100 [%]
is not an acceptable design practice, as this condition could
cause unwanted triggering of the output over-voltage protec-
tion (OVP) circuit. The designer should ensure that the dif-
ference between the voltages across the converter’s output
V O ? REQ = Desired (trimmed) output voltage [V].
When trimming up, care must be taken not to exceed the
converter‘s maximum allowable output power. See previous
section for a complete discussion of this requirement.
To decrease the output voltage (Fig. 5), a trim resistor,
R T-DECR , should be connected between the TRIM (Pin 6) and
SENSE(-) (Pin 5), with a value of:
pins and its sense pins does not exceed 0.33 V, or:
[V OUT ( + ) ? V OUT ( ? )] ? [V SENSE ( + ) ? V SENSE ( ? )] ≤ 0.33 [V]
This equation is applicable for any condition of output sens-
ing and/or output trim.
R T ? DECR =
where,
511
| ? |
? 10.22 [k ? ]
MAR 20, 2003 revised to NOV 20, 2006
Page 6 of 14
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