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参数资料
| 型号： | SQL48T20033-NDABG |
| 厂商： | POWER-ONE INC |
| 元件分类： | 电源模块 |
| 英文描述： | DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT, ONE-EIGHTH BRICK PACKAGE-8 |
| 文件页数： | 10/14页 |
| 文件大小： | 773K |
| 代理商： | SQL48T20033-NDABG |
Rev 0.2, 3-Mar-11
www.power-one.com
Page 5 of 14
SQL48T20033 DC-DC Converter
36-75 VDC Input; 3.3 VDC @ 20A Output
Preliminary Data Sheet
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
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
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.
The converters 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.
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.
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 con
verters
actual output power remains at or below the
maximum allowable output power.
Output Voltage Adjust / TRIM
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. For
output voltage 3.3V, trim-up to 10% is guaranteed at
Vin ≥ 40V, and to 8% at Vin ≥ 36V.
The TRIM pin should be left open if trimming is not
being used. To minimize noise pickup, a 0.1 F
capacitor is connected internally between the TRIM
and SENSE(-) pins.
To increase the output voltage (Fig. C) a trim resistor,
RT-INCR, should be connected between the TRIM (Pin 6)
and SENSE(+) (Pin 7), with a value of
10.22
1.225
Δ
626
Δ)V
5.11(100
R
NOM
O
INCR
T
[kΩ]
where,
RT-INCR = Required value of trim-up resistor [kΩ]
VO-NOM = Nominal value of output voltage [V]
100
X
V
)
V
(V
Δ
NOM
-
O
NOM
-
O
REQ
-
O
[%]
VO-REQ = Desired (trimmed) output voltage [V].
When trimming up, care must be taken not to exceed
the converters maximum allowable output power. See
the previous section for a complete discussion of this
requirement.
Fig. C: Configuration for increasing output voltage.
To decrease the output voltage (Fig. D), a trim resistor,
RT-DECR, should be connected between the TRIM (Pin
6) and SENSE(-) (Pin 5), with a value of:
10.22
|
Δ
|
511
R DECR
T
[kΩ]
where,
RT-DECR = Required value of trim-down resistor [kΩ]
and
is defined above.
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.
Rload
Vin
Vin (+)
Vin (-)
ON/OFF
Vout (+)
Vout (-)
TRIM
SENSE (+)
SENSE (-)
RT-INCR
(Top View)
SQL 48 Converter
Rload
Vin
Vin (+)
Vin (-)
ON/OFF
Vout (+)
Vout (-)
TRIM
SENSE (+)
SENSE (-)
R
T-DECR
(Top View)
SQL 48 Converter
100
10
Rw
Rload
Vin
Vin (+)
Vin (-)
ON/OFF
Vout (+)
Vout (-)
TRIM
SENSE (+)
SENSE (-)
(Top View)
SQL 48 Converter
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