SQ24X03150 Power-One, SQ24X03150 Datasheet - Page 5

• Manufacturer Part Number: SQ24X03150
• Description: Sq24t/s03150 Dc-dc Converter 19-36 Vdc Input; 15 Vdc Output @ 3.3 A
• Manufacturer: Power-One

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)
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 (Pin 6)
The converter’s output voltage can be adjusted up
10% or down 20% relative to the rated output voltage
by the addition of an externally connected resistor.
Trim up to 10% is guaranteed only at Vin ≥ 21 V, and
to 5% is guaranteed only at Vin ≥ 20 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
TRIM (Pin 6) and SENSE(+) (Pin 7), with a value of:
where,
When trimming up, care must be taken not to exceed
the converter‘s maximum allowable output power.
See previous section for a complete discussion of
this requirement.
JAN 21, 2004 revised to AUG 23, 2006
R
R
V
∆
V
Vin
T
T
O
O
−
=
−INCR
INCR
−NOM
−REQ
Fig. C: Configuration for increasing output voltage.
(V
=
O
=
=
=
-
5.11(100
REQ
Required value of trim-up resistor kΩ]
Nominal value of output voltage [V]
Desired (trimmed) output voltage [V].
V
T-INCR
O
−
-
NOM
V
, should be connected between the
Vin (+)
ON/OFF
O
Vin (-)
-
NOM
+
1.225∆
∆)V
)
X
Semi
O
(Top View)
100
−
Converter
NOM
Q
TM
Family
−
[%]
626
SENSE (+)
SENSE (-)
−
Vout (+)
Vout (-)
10.22
TRIM
[kΩ]
SQ24T/S03150 DC-DC Converter Data Sheet
R
T-INCR
Page 5 of 15
19-36 VDC Input; 15 VDC Output @ 3.3 A
Rload
To decrease the output voltage (Fig. D), a trim
resistor, R
TRIM (Pin 6) and SENSE(-) (Pin 5), with a value of:
where,
and ∆ is as defined above.
Note: The above equations for calculation of trim
resistor values match those typically used in
conventional industry-standard, quarter-bricks and
one-eighth
Application Note 103.
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 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%
This equation is applicable for any condition of
output sensing and/or output trim.
Protection Features
Input Undervoltage Lockout
Input undervoltage lockout is standard with this
converter. The converter will shut down when the
input voltage drops below a pre-determined voltage.
The input voltage must be at least 17.5 V for the
converter to turn on. Once the converter has been
turned on, it will shut off when the input voltage
drops below 15 V. This feature is beneficial in
R
R
[V
Vin
T
T
OUT
−
−DECR
DECR
Fig. D: Configuration for decreasing output voltage.
) (
+
=
−
V
=
|
511
OUT
∆
Required value of trim-down resistor [kΩ]
T-DECR
|
(
−
brick.
−
)]
10.22
−
Vin (+)
ON/OFF
Vin (-)
, should be connected between the
[V
SENSE
For
[kΩ]
) (
Semi
+
(Top View)
Converter
−
V
Q
more
SENSE
TM
Family
(
−
)]
www.power-one.com
≤
information,
SENSE (+)
SENSE (-)
of V
V
Vout (+)
O
Vout (-)
TRIM
-
NOM
OUT
(
X
NOM
10%
)
, or:
R
see
T-DECR
[V]
Rload