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SQL48T20033 DC-DC Converter Data Sheet
36-75 VDC Input; 3.3 VDC @ 20A Output
Vin (+)
SQL 48 Converter
Vout (+)
(Top View) 100
SENSE (+)
Rw
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
Vin
ON/OFF
TRIM
Rload
and SENSE(-) pins.
SENSE (-)
10
To increase the output voltage (Fig. C) a trim resistor,
Vin (-)
Vout (-)
Rw
R T-INCR , should be connected between the TRIM (Pin 6)
and SENSE(+) (Pin 7), with a value of
5.11(100 + Δ)V O ? NOM ? 626
Fig. B: Remote sense circuit configuration.
Caution:
If remote sensing is not utilized, the SENSE(-) pin
must be connected to the Vout(-) pin, and the
SENSE(+) pin must be connected to the Vout(+) pin to
R T ? INCR = ? 10.22
1.225 Δ [kΩ]
where,
R T-INCR = Required value of trim- up resistor [kΩ]
V O-NOM = Nominal value of output voltage [V]
ensure the converter will regulate at the specified
output voltage. If these connections are not made, the
converter will deliver an output voltage that is slightly
Δ =
(V O - REQ ? V O - NOM )
V O - NOM
X 100
[%]
higher than the specified data sheet value.
Because the sense leads carry minimal current,
large traces on the end-user board are not required.
However, sense traces should be run side by side
and located close to a ground plane to minimize
system noise and ensure optimum performance.
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.
The converter’s output overvoltage protection (OVP)
circuitry senses the voltage across Vout(+) and
Vout(-), and not across the sense lines, so the
resistance (and resulting voltage drop) between the
output pins of the converter and the load should be
minimized to prevent unwanted triggering of the
OVP.
Vin
Vin (+)
ON/OFF
Vin (-)
SQL 48 Converter
Vout (+)
(Top View)
SENSE (+)
TRIM
SENSE (-)
Vout (-)
R T-INCR
Rload
When utilizing the remote sense feature, care must
be taken not to exceed the maximum allowable
output power capability of the converter, which is
equal to the product of the nominal output voltage
and the allowable output current for the given
conditions.
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 =
? 10.22
| Δ |
When using remote sense, the output voltage at the
converter 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)
where,
511
[kΩ]
R T-DECR = Required value of trim- down resistor [kΩ]
and ? is defined above.
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
Note:
The above equations for calculation of trim resistor values match
those typically used in conventional industry-standard quarter-bricks,
eighth-bricks and sixteenth-brick models.
The output voltage can be adjusted up 10% or down
20% relative to the rated output voltage by the
Vin (+)
SQL 48 Converter
Vout (+)
(Top View)
SENSE (+)
addition of an externally connected resistor. For
output voltage 3.3V, trim-up to 10% is guaranteed at
Vin ≥ 40V, and to 8% at Vin ≥ 36V .
Vin
ON/OFF
Vin (-)
TRIM
SENSE (-)
Vout (-)
R T-DECR
Rload
Rev 0.2, 3-Mar-11
www.power-one.com
Page 5 of 14
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