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參數(shù)資料
| 型號： | ASQ48T15033-NEB0 |
| 廠商： | POWER-ONE INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 49.5 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ONE-EIGHTH BRICK PACKAGE-8 |
| 文件頁數(shù)： | 13/15頁 |
| 文件大小： | 267K |
| 代理商： | ASQ48T15033-NEB0 |
MCD10170 Rev. 1.0, 10-Jun-10
Page 7 of 15
www.power-one.com
ASQ48T15033 & ASQ48S15033 DC-DC Converter Data Sheet
36 to 75 VDC Input; 15A, 3.3 VDC Output
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.
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 guar-
anteed only at Vin ≥ 40 V, and it is marginal (8% to 10%) at
Vin = 36 V.
The TRIM pin should be left open if trimming is not being
used. To minimize noise pickup, a 0.1 F capacitor is con-
nected internally between the TRIM and SENSE(-) pins.
To increase the output voltage, refer to Fig. 4. 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
]
where,
INCR
T
R
Required value of trim-up resistor k
]
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.
To decrease the output voltage (Fig. 5), 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
]
where,
DECR
T
R
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 and one-eighth bricks. For more informa-
tion see Application Note 103.
Rload
Vin
Vin (+)
Vin (-)
ON/OFF
Vout (+)
Vout (-)
TRIM
SENSE (+)
SENSE (-)
R T-INCR
(Top View)
Converter
Semi
QTM Family
Fig. 4: Configuration for increasing output voltage.
Rload
Vin
Vin (+)
Vin (-)
ON/OFF
Vout (+)
Vout (-)
TRIM
SENSE (+)
SENSE (-)
RT-DECR
(Top View)
Converter
Semi
QTM Family
Fig. 5: 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 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 0.33 V, or:
0.33
)]
(
V
)
(
[V
)]
(
V
)
(
[V
SENSE
OUT
[V]
This equation is applicable for any condition of output sens-
ing and/or output trim.
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