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SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
current (originally obtained from the derating curves)
by the same percentage to ensure the converter’s
actual output power remains at or below the
maximum allowable output power.
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:
Output Voltage Adjust /TRIM (Pin 6)
R T ? DECR =
511
| Δ |
? 10.22
[k ? ]
(3.3 – 1.5 V)
[k ? ]
R T ? DECR =
? 15
| Δ |
The output voltage can be adjusted up 10% or down
20% for Vout ≥ 1.5 V, and ± 10% for Vout = 1.2 V
relative to the rated output voltage by the addition of
an externally connected resistor. For output voltage
3.3 V, trim up to 10% is guaranteed only at Vin ≥
40 V, and it is marginal (8% to 10%) at Vin = 36 V.
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:
700
(1.2 V)
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 (except for 1.2 V output).
Converters with output voltages 1.2 V is available with alternative
R T ? INCR =
5.11(100 + Δ)V O ? NOM ? 626
1.225 Δ
? 10.22
[k ? ],
trim feature to provide the customers with the flexibility of second
sourcing has a character “T” in the part number. The trim
equations of “T” version of converters and more information can
be found in Application Note for Output Voltage Trim Function
Operation.
for 3.3 – 1.5 V.
R T ? INCR =
84.6
Δ
? 7.2
[k ? ]
(1.2 V)
Vin (+)
SQE48 Converter
(Top View)
Vout (+)
SENSE (+)
where,
R T ? INCR = Required value of trim-up resistor k ? ]
Vin
ON/OFF
TRIM
SENSE (-)
R T-DECR
Rload
V O ? NOM = Nominal value of output voltage [V]
Vin (-)
Vout (-)
Δ =
(V O -REQ ? V O -NOM )
V O - NOM
X 100
[%]
Fig. D: Configuration for decreasing output voltage.
Trimming/sensing beyond 110% of the rated 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 the previous section for a complete discussion
of this requirement.
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
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-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 6 of 29
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