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SQE48T50012 DC-DC Converter
36-75 VDC Input; 1.2 VDC @ 50 A Output
Data Sheet
actual output power remains at or below the
maximum allowable output power.
Output Voltage Adjust /TRIM (Pin 6)
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:
The output voltage can be adjusted up 10% or down
20%, relative to the rated output voltage by the
R T ? DECR =
511
| ? |
? 10.22
[k ? ]
addition of an externally connected resistor.
The TRIM pin should be left open if trimming is not
being used. To minimize noise pickup, a 0.1 μF
capacitor is connected internally between the TRIM
and SENSE(-) pins.
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:
where,
R T ? DECR = Required value of trim-down resistor [k ? ]
and ? is defined above.
Note:
The above equations for calculation of trim resistor values match
those typically used in conventional industry-standard quarter-
bricks.
R T ? INCR =
5.11 × (100 + ? ) × V O ? NOM
0.6 ?
?
511
?
- 10.22 [k ? ],
Vin (+)
SQE48 Converter
Vout (+)
where,
(Top View)
SENSE (+)
R T ? INCR = Required value of trim-up resistor k ? ]
Vin
ON/OFF
Vin (-)
TRIM
SENSE (-)
Vout (-)
R T-DECR
Rload
V O ? NOM = Nominal value of output voltage [V]
Fig. D: Configuration for decreasing output voltage.
? =
(V O - REQ ? V O - NOM )
V O - NOM
X 100
[%]
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
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.
designer should ensure that the difference between
the voltages across the converter’s output pins and its
sense pins does not exceed 10% of V OUT ( NOM ), or:
[V OUT ( + ) ? V OUT ( ? )] ? [V SENSE ( + ) ? V SENSE ( ? )] ≤ V O - NOM X 10% [V]
Vin
Vin (+)
ON/OFF
SQE48 Converter
(Top View)
Vout (+)
SENSE (+)
TRIM
R T-INCR
Rload
This equation is applicable for any condition of output
sensing and/or output trim.
SENSE (-)
Vin (-)
Vout (-)
Fig. C: Configuration for increasing output voltage.
ZD-01731 Rev 2.0
www.power-one.com
Page 6 of 13
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