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SQE48T40018 DC-DC Converter
36-75 VDC Input; 1.8 VDC @ 40 A Output
Data Sheet
actual output power remains at or below the
maximum allowable output power.
R T ? DECR ?
511
| Δ |
? 10.22
[k ? ]
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
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 Δ is defined above.
Note:
The above equations for calculation of trim resistor values match
those typically used in conventional industry-standard quarter-
bricks.
Vin (+)
SQE48 Converter
Vout (+)
R T ? INCR ?
5.11(100 ? Δ )V O ? NOM ? 626
1.225 Δ
? 10.22
[k ? ],
Vin
ON/OFF
(Top View)
SENSE (+)
TRIM
SENSE (-)
R T-DECR
Rload
where,
Vin (-)
Vout (-)
Fig. D: Configuration for decreasing output voltage.
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
Δ ?
(V O -REQ ? V O -NOM )
V O - NOM
X 100
[%]
output overvoltage protection (OVP) circuit. The
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 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 (+)
SQE48 Converter
(Top View)
Vout (+)
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:
ZD-01744 Rev 1.1.1, 23-Feb-10
www.power-one.com
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