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| 型號(hào)： | LT1701-7DFB1 |
| 廠商： | POWER-ONE INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 550 W AC-DC REG PWR SUPPLY MODULE |
| 封裝： | CASE T01, MODULE |
| 文件頁(yè)數(shù)： | 32/33頁(yè) |
| 文件大?。?/td> | 838K |
| 代理商： | LT1701-7DFB1 |
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T Series
AC-DC Converters >100 Watt
Rugged Environment
Edition 4/4.99
8/33
MELCHER
The Power Partners.
Hold-up Time (Rectifier Version)
The hold-up time depends upon the output voltage at the
time of failure, the minimum acceptable output voltage and
the load according to the following formula:
Uo2 – Uo2 min u
thold = –––––––––––– (Co + Cext)
2
Po
where:
Uo
= Output voltage at the moment of mains failure
Uo min u = Minimum acceptable output voltage
Po
= Average output power during hold up time
Co
= Internal output capacitance
Cext
= External output capacitance (e.g. on backplane)
Examples of
t hold are given in the table below:
Table 5: Hold-up time thold for T1701
Uo = 54 V
Uo min u
Unit
Po [W]
46 V
43 V
40 V
38 V
100
164
219
270
302
ms
200
82
109
135
151
300
55
73
90
101
400
41
55
67
75
500
33
44
54
60
550
30
40
49
55
Output voltage regulation (Rectifier Version)
The output voltage of rectifier models is adjusted to a fixed
value
Uo set. It relates to the output current and the input
voltage which ensures automatic current sharing operation
without further precautions when several units are con-
nected in parallel. Rising output current and falling input
voltage lead to a decrease of the output voltage, according
to the formula:
Uo
≈ U
o set tol + (0.5 – Io/Ionom) DUo l + (Ui - Ui nom)/100 V
DUo U
Fig. 7
Typical output voltage versus input voltage and output
current of LT 1701
Note: Units with different output voltage regulation charac-
teristics (e.g. less output current dependency) are available
upon request.
Output power limitation (Rectifier Version)
Especially for power systems with an output voltage of 48V
and more, the rectifier models T 1701/1702 feature an out-
put power limitation mode. The output power is kept con-
stant down to an output voltage of approximately 38 V. This
provides improved start-up capabilities of power systems
including switched mode power supplies connected to the
DC bus (e.g. Melcher CQ units). At maximum load there is
no need for a special start-up procedure.
The maximum input current is limited to
I i L. At lower input
voltage
Ui red the maximum output power is limited to:
Po
≈ h U
i red Ii L
(
h = efficiency
≈ 90%)
The T 1201 types have no output power limitation charac-
teristic.
Output Overvoltage Protection (Rectifier Version)
A slight output voltage overshoot may occur at turn on, in-
hibit release or during fast load changes. A second, inde-
pendent control loop interrupts operation above
Uo L indi-
cated by the red LED. The output voltage remains below
60 V (SELV) under all operating conditions.
Note: There is no specific built-in protection against exter-
nally applied overvoltages or transient sources like e.g.
motors. Never apply voltages
>60 V (>35 V) to the output.
Otherwise the unit may be damaged.
2%
1%
0
–1%
–2%
0.01
0.5
1
Io/Io nom
Uo set
U
o
Load
regulation
05081
Output current limitation (Rectifier Version)
The output of the T units is fully protected against continu-
ous short circuit. The maximum constant current is limitted
to
Io L (see table: Electrical output data). As the LEDs indi-
cating the system status are driven from the output voltage,
in short circuit mode all LEDs switch off.
Io [A]
0
Uo [V]
48
04027
11
14.5
38
54.5
10
Fig. 8
Typical output voltage versus output current of UT/LT 1701/
1702
Io [A]
0
Uo [V]
05048
16
24
Fig. 9
Typical output voltage versus output current of UT/LT 1201
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