Q24T30015-NAA0G
| Model | Q24T30015-NAA0G |
| Description | DC-DC Regulated Power Supply Module, 1 Output, 45W, Hybrid, ROHS COMPLIANT, QUARTER BRICK, PACKAGE-8 |
| PDF file | Total 14 pages (File size: 252K) |
| Chip Manufacturer | BEL |
Q24T30015 DC-DC Converter Data Sheet
18-36 VDC Input; 1.5 VDC @ 30A Output
When using remote sense, the output voltage at the conver-
ter 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 al-
lowable output power.
Vin (+)
Q
Family
Converter
TM
Vout (+)
SENSE (+)
R
T-INCR
(Top View)
Vin
ON/OFF
TRIM
SENSE (-)
Rload
Vin (-)
Vout (-)
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.
The TRIM pin should be left open if trimming is not being
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. 4. A trim resistor,
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
10.22
[k]
1.225Δ
Fig. 4:
Configuration for increasing output voltage.
R
T
DECR
�½
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.
Vin (+)
Family
Converter
TM
Q
Vout (+)
SENSE (+)
TRIM
SENSE (-)
R
T-DECR
Rload
(Top View)
R
T
INCR
�½
Vin
ON/OFF
where,
R
T
INCR
�½
Required value of trim-up resistor k]
V
O
NOM
�½
Nominal value of output voltage [V]
Vin (-)
Vout (-)
Fig. 5:
Configuration for decreasing output voltage.
Δ
�½
(V
O-REQ
V
O-NOM
)
X 100
[%]
V
O -NOM
V
O
REQ
�½
Desired (trimmed) output voltage [V].
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.
To decrease the output voltage (Fig. 5), 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
�½
511
10.22
[k]
Δ
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-
ference between the voltages across the converter’s output
pins and its sense pins does not exceed 0.15 V, or:
[V
OUT
(
)
V
OUT
(
)]
[V
SENSE
(
)
V
SENSE
(
)]
0.15
[V]
This equation is applicable for any condition of output sens-
ing and/or output trim.
where,
MCD10224 Rev. 1.0, 07-Sep-10
Page 6 of 14
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