參數(shù)資料
型號(hào)： SQ24T04025-NDA0
廠(chǎng)商： POWER-ONE INC
元件分類(lèi)： 電源模塊
英文描述： 1-OUTPUT 50 W DC-DC REG PWR SUPPLY MODULE
封裝： ROHS COMPLIANT, ONE-EIGHTH BRICK PACKAGE-8
文件頁(yè)數(shù)： 34/70頁(yè)
文件大?。?/td> 933K
代理商： SQ24T04025-NDA0
AUG 25, 2006 revised to MAR 19, 2007
Page 4 of 70
www.power-one.com
SQ24 Series DC-DC Converter Data Sheet
18-36 VDC Input; Standard Outputs from 1-12 VDC
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% for Vout ≥ 1.5V, and ±10% for Vout = 1.2V and
1.0 V, relative to the rated output voltage by the addition of
an externally connected resistor. For output voltages 3.3V,
trim up to 10% is guaranteed only at Vin ≥ 20V, and it is
marginal (8% to 10%) at Vin = 18V depending on load
current.
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, refer to 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
1.225Δ
626
Δ)V
5.11(100
R
NOM
O
INCR
T
+
=
[k
Ω] (1.5 –12V)
Δ
485
R INCR
T
=
[k
Ω] (1.2V)
2
Δ
323
R INCR
T
=
[k
Ω] (1.0V)
where,
=
INCR
T
R
Required value of trim-up resistor k
Ω]
=
NOM
O
V
Nominal value of output voltage [V]
100
X
V
)
V
(V
Δ
NOM
-
O
NOM
-
O
REQ
-
O
=
[%]
=
REQ
O
V
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.
Rload
Vin
Vin (+)
Vin (-)
ON/OFF
Vout (+)
Vout (-)
TRIM
SENSE (+)
SENSE (-)
R T-INCR
(Top View)
Converter
Semi
QTM Family
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
=
[k
Ω]
(1.0 – 12V)
where,
=
DECR
T
R
Required value of trim-down resistor [k
Ω]
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 and one-eighth bricks.
Converters with output voltage 1.2V and 1.0V have specific
trim schematic and equations, to provide the customers with
the flexibility of second sourcing. For these converters, the
last character of part number is “T”. More information about
trim feature, including corresponding schematic portions, can
be found in Application Note 103.
Rload
Vin
Vin (+)
Vin (-)
ON/OFF
Vout (+)
Vout (-)
TRIM
SENSE (+)
SENSE (-)
RT-DECR
(Top View)
Converter
Semi
QTM Family
Fig. D: Configuration for decreasing output voltage.
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
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% of
VOUT(NOM), or:
X
NOM
-
O
SENSE
OUT
10%
V
)]
(
V
)
(
[V
)]
(
V
)
(
[V
≤
+
+
[V]
This equation is applicable for any condition of output
sensing and/or output trim.
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