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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
V o
? V o I
05051a
control loop interrupts the operation above V o 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
? V o d
10% ? V o d
V o
applied overvoltages or transients.
Output Voltage Regulation (Rectifier Version)
The output voltage is adjusted to a fixed value V o set . It relates
to the output current and the input voltage, which ensures
current sharing without further precautions, when several
I o / I o nom
1
0.9
t d
t
converters are connected in parallel. Rising output current and
falling input voltage lead to a decrease of the output voltage,
according to the formula:
V o ≈ V o set tol + (0.5 – I o / I o nom ) ? ? V o l + ( ? V i – ? V i nom )/100 V ? ? V o V
0.1
Fig. 9
Typ. dynamic characteristics (at load step)
Output Power Limitation (Rectifier Version)
t
V o [V]
Especially for power systems with an output voltage of 48 V,
54.4
48
38
24
04027a
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 V i red the maximum output power is limited to:
P o ≈ η ? V i red ? I i L
( η = efficiency approx. 90%)
T1201 models have no output power limitation mode.
Pulse Loading (Rectifier Version)
0
10 11
14.5
16 A
I o
To prevent the output and filter capacitors from overload, the
superimposed AC ripple current at the output should be limited
T1201
T1701/1702
as shown in the figure below. For high-current pulse loads,
external capacitors are recommended.
Fig. 7
Output characteristic of T1201 and T1701/1702 (typ.). The
droop is shown in fig. 8.
I o PL [A]
15
V i = V i nom
05050a
? V o
05081a
10
Average output current = I o nom
2%
1%
V o set
–1%
5
T C = 50° C
T C = T C max
–2%
0
50
100
1k
10 k
f PL [Hz]
I o / I o nom
0.01
0.5
1
Fig. 10
Fig. 8
Typical output droop (LT 1701)
Maximum AC ripple output current superimposed on the
average output current I o nom for LT1701.
BCD20023 Rev AB, 02-Nov-2010
Page 8 of 31
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