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SQM48 Series Data Sheet
SemiQ
TM
Family 25A DC-DC Converters
actual output power remains at or below the maximum al-
lowable 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)
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.
The TRIM pin should be left open if trimming is not being
R T ? DECR ?
R T ? DECR ?
where,
511
Δ
700
Δ
? 10.22 [k ? ] (2.5 – 1.5 V)
? 15 [k ? ] (1.2 V)
used. To minimize noise pickup, a 0.1 μF capacitor is con-
nected internally between the TRIM and SENSE(-) pins.
To increase the output voltage, refer to Fig. C. A trim resis-
tor, R T-INCR , should be connected between the TRIM (Pin 6)
and SENSE(+) (Pin 7), with a value of:
R T ? DECR ? Required value of trim-down resistor [k ? ]
and Δ is as defined above.
Note: The above equations for calculation of trim resistor
values match those typically used in conventional industry-
standard quarter bricks.
Semi Q Family
R T ? INCR ?
5.11(100 ? Δ )V O ? NOM ? 626
1.225 Δ
? 10.22 [k ? ] (2.5 –1.5V)
Vin (+)
TM
Converter
Vout (+)
R T ? INCR ?
84.6
Δ
? 7.2 [k ? ]
(1.2 V)
Vin
ON/OFF
(Top View)
SENSE (+)
TRIM
SENSE (-)
R T-DECR
Rload
where,
Vin (-)
Vout (-)
R T ? INCR ? Required value of trim-up resistor k ? ]
V O ? NOM ? Nominal value of output voltage [V]
Fig. D: Configuration for decreasing output voltage.
Δ ?
(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 over-voltage protec-
tion (OVP) circuit. The designer should ensure that the dif-
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 previous
the section for a complete discussion of this requirement.
ference 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]
Semi Q Family
Vin (+)
TM
Converter
(Top View)
Vout (+)
SENSE (+)
R T-INCR
This equation is applicable for any condition of output sens-
ing and/or output trim.
Vin
ON/OFF
TRIM
Rload
SENSE (-)
Vin (-)
Vout (-)
Fig. C: Configuration for increasing output voltage .
MCD10085 Rev. 1.1, 08-Jul-10
Page 4 of 30
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