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QME48T40050 DC-DC Converter Data Sheet
36-75 VDC Input; 5.0 VDC @ 40 A Output
by the same percentage to ensure the converter’s
actual output power remains at or below the
maximum allowable output power.
Output Voltage Adjust /TRIM (Pin 6)
The output voltage can be adjusted up 10% or down
20% relative to the rated output voltage by the
addition of an externally connected resistor.
The TRIM pin should be left open if trimming is not
where,
R T ? DECR ? Required value of trim-down resistor [k ? ]
and Δ is defined above.
Note:
The above equations for calculation of trim resistor values
match those typically used in conventional industry-standard
quarter-bricks.
being used. To minimize noise pickup, a 0.1 μF
capacitor is connected internally between the TRIM
and SENSE(-) pins.
Vin (+)
QME Series
Converter
(Top View)
Vout (+)
SENSE (+)
To increase the output voltage, refer to Fig. C. A trim
resistor, R T-INCR , should be connected between the
TRIM (Pin 6) and SENSE(+) (Pin 7), with a value of:
Vin
ON/OFF
Vin (-)
TRIM
SENSE (-)
Vout (-)
R T-DECR
Rload
R T ? INCR ?
5.11(100 ? Δ )V O ? NOM ? 626
1.225 Δ
? 10.22
[k ? ],
Fig. D: Configuration for decreasing output voltage.
where,
R T ? INCR ? Required value of trim-up resistor k ? ]
V O ? NOM ? Nominal value of output voltage [V]
Trimming/sensing beyond 110% of the rated output
voltage is not an acceptable design practice, as this
condition could cause unwanted triggering of the
output overvoltage protection (OVP) circuit. The
designer should ensure that the difference between
Δ ?
(V O -REQ ? V O -NOM )
V O - NOM
X 100
[%]
the voltages across the converter’s output pins and
its sense pins does not exceed 10% of V OUT ( NOM ),
or:
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 the previous section for a complete discussion
of this requirement.
[V OUT ( ? ) ? V OUT ( ? )] ? [V SENSE ( ? ) ? V SENSE ( ? )] ? V O - NOM X 10% [V]
This equation is applicable for any condition of
output sensing and/or output trim.
Vin (+)
QME Series
Converter
Vout (+)
(Top View)
SENSE (+)
R T-INCR
Vin
ON/OFF
TRIM
Rload
SENSE (-)
Vin (-)
Vout (-)
Fig. C: Configuration for increasing output voltage.
To decrease the output voltage (Fig. D), a trim
resistor, R T-DECR , should be connected between the
TRIM (Pin 6) and SENSE(-) (Pin 5), with a value of:
R T ? DECR ?
511
| Δ |
? 10.22
[k ? ]
ZD-00371 Rev 2, 22-May-09
Page 5 of 13
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