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參數(shù)資料
| 型號： | SHM48T40010-PBC0 |
| 廠商： | POWER-ONE INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 32/37頁 |
| 文件大小： | 697K |
| 代理商： | SHM48T40010-PBC0 |
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SHM48 Series - 40A
Data Sheet
SHM48T40 Family DS Ver 2 03-24-03
USA Toll Free 866 WOW-didt
Page 4 of 37
When using remote sense, the output voltage at the con-
verter 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-
verter’s actual output power remains at or below the maxi-
mum allowable output power.
Output Voltage Adjust /TRIM (Pin 6)
The output voltage can be adjusted up 10% or down 20% for
Vout ≥ 1.5 V, and ±10% for Vout = 1.2 V and 1.0 V relative
to the rated output voltage by the addition of an externally
connected resistor. For 3.3 V output voltage, trim up to 10%
is guaranteed 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. C. A trim resis-
tor, RT-INCR, should be connected between the TRIM (Pin 6)
and SENSE(+) (Pin 7), with a value of:
2
1.225
V
1.225
225
.
1
V
R
NOM
O
NOM
O
INCR
T
+
=
[k
] (3.3 -1.5V)
96
R INCR
T
=
[k
] (1.2 V)
63
R INCR
T
=
[k
] (1.0 V)
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
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.
Vin
Rload
Vin (+)
Vin (-)
ON/OFF
Vout (+)
Vout (-)
TRIM
SENSE (+)
SENSE (-)
R T-INCR
(Top View)
Converter
Family
SemiHTM
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:
2
|
|
100
R DECR
T
=
[k
] (3.3 - 1.0 V)
where,
=
DECR
T
R
Required value of trim-down resistor [k
]
and is as defined above.
Note: The above equations for calculation of trim resistor
values match those typically used in conventional industry-
standard half bricks (except for 1.2 V and 1.0 V outputs). For
more information see Application Note 103.
Rload
Vin
Vin (+)
Vin (-)
ON/OFF
Vout (+)
Vout (-)
TRIM
SENSE (+)
SENSE (-)
RT-DECR
(Top View)
Converter
Family
SemiHTM
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 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 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 sens-
ing and/or output trim.
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