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參數(shù)資料
| 型號： | LT1740-7Z |
| 廠商： | POWER-ONE INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 500 W AC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 31/32頁 |
| 文件大小： | 1000K |
| 代理商： | LT1740-7Z |
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BCD20023 Rev. AA, 3-Sep-2008
Page 8 of 32
www.power-one.com
T Series Data Sheet
500 Watt AC-DC Converters
Output Overvoltage Protection
A slight output voltage overshoot may occur at turn-on, inhibit
release, or during fast load changes. A second, independent
control loop interrupts the operation above Vo L and indicate it
by the red warning LED. The output voltage remains below
60 V (SELV) under all operating conditions.
Note: There is no specific built-in protection against externally
applied overvoltages or transients.
Output Voltage Regulation (Rectifier Version)
The output voltage is adjusted to a fixed value Vo set. It relates
to the output current and the input voltage, which ensures
current sharing without further precautions, when several
converters are connected in parallel. Rising output current and
falling input voltage lead to a decrease of the output voltage,
according to the formula:
Vo
≈ Voset tol + (0.5 – Io/Io nom) Vo l + (Vi – Vi nom)/100 V VoV
Output Power Limitation (Rectifier Version)
Especially for power systems with an output voltage of 48 V,
the rectifier models T1701/1702 exhibit an output power
limitation mode. The output power is kept constant down to an
output voltage of approximately 38 V. This provides improved
start-up capability of power systems including switched-mode
power supplies connected to the output (e.g. 48Q Series). 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 Vi red the maximum output power is limited to:
Po
≈ η Vi red Ii L
(
η = efficiency approx. 90%)
T 1201 models have no output power limitation mode.
Pulse Loading (Rectifier Version)
To prevent the output and filter capacitors from overload, the
superimposed AC ripple current at the output should be limited
as shown in the figure below. For high-current pulse loads,
external capacitors are recommended.
Vo
td
V
o I
10%
V
o d
t
Io /Io nom
1
0.9
0.1
V
o d
05051a
Vo
Fig. 9
Typ. dynamic characteristics (at load step)
Io
0
Vo [V]
48
04027a
10 11
14.5
16 A
38
54.4
24
T1201
T1701/1702
Fig. 7
Output characteristic of T1201 and T1701/1702 (typ.). The
droop is shown in fig. 8.
Fig. 8
Typical output droop (LT 1701)
2%
1%
–1%
–2%
0.01
0.5
1
Io/Io nom
Vo set
V
o
05081a
15
10
5
0
100
1 k
10 k
Io PL [A]
fPL [Hz]
TC = 50° C
TC = TC max
Vi = Vi nom
Average output current = Io nom
Sinusoidal
ripple
current
50
05050a
Fig. 10
Maximum AC ripple output current superimposed on the
average output current Io nom for LT1701.
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