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DATA SHEET
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.
The converter’s output overvoltage protection (OVP) 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.
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 con-
ditions.
When using remote sense, the output voltage at the converter can be increased by as much as 10% above the nominal rat-
ing in order to maintain the required voltage across the load. Therefore, the designer must, if necessary, decrease the maxi-
mum 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.
2.4
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 0.1μ F 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:
R T ? INCR ?
5.11(100 ? Δ)V O ? NOM ? 626
1.225 Δ
? 10.22
[k ? ],
where,
R T ? INCR ? Required value of trim-up resistor k ? ]
V O ? NOM ? Nominal value of output voltage [V]
Δ ?
(V O -REQ ? V O -NOM )
V O - NOM
X 100
[%]
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.
Fig. C: Configuration for increasing output voltage.
Vin (+)
SQE48 Converter
(Top View)
Vout (+)
SENSE (+)
R T-INCR
Vin
ON/OFF
TRIM
Rload
SENSE (-)
Vin (-)
Vout (-)
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 ? ]
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.
ZD-01745_1.1_September-10-2013
5
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