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参数资料
| 型号： | LT1702-7D |
| 厂商： | POWER-ONE INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 550 W AC-DC REG PWR SUPPLY MODULE |
| 封装： | CASE T01, MODULE |
| 文件页数： | 8/33页 |
| 文件大小： | 838K |
| 代理商： | LT1702-7D |
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T Series
AC-DC Converters >100 Watt
Rugged Environment
Edition 4/4.99
16/33
MELCHER
The Power Partners.
Table 12: Calculation of Rext
Types
Ut > Ut set
Ut < Ut set
(
Rext. connected to Vo–)(Rext. connected to Vo+)
T 12xx
463.5
43.2
Ut – 463.5
Rext (Ut) = –––––––– [k]
Rext (Ut) = ––––––––––––– [k]
Ut –21.0
21.0 –
Ut
T 17xx
933
43.2
Ut – 933
Rext (Ut) = –––––––– [k]
Rext (Ut) = ––––––––––––– [k]
Ut – 42.5
42.5 –
Ut
T 18xx
461
21.4
Ut – 461
Rext (Ut) = –––––––– [k]
Rext (Ut) = ––––––––––––– [k]
Ut – 32.0
32.0 –
Ut
Functional Features
Available Signals and Status Monitoring
The T series feature an inhibit function as well as several
voltage monitoring and indicating functions for easy control
and surveillance of a complete custom specific power sup-
ply system. All the surveillance functions are driven from
the T output potential and also operate in case of a mains
failure down to an output voltage of 5 V. The power con-
sumption of the surveillance circuit is typically 10 mA to
20 mA.
Available functions:
– Power Down
D
pin 30
D set
pin 32
– System Good
Sys In
pin 24
Sys Out
pin 26
– Inhibit/Ucr remote control
i/Ucr
pin 28
(see Chapters:
Rectifier respectively: Battery Charger)
Optical status monitoring is indicated by 3 LEDs on the front
panel:
– System
(OK)
green
–
Uo
(OK)
green
– Error
red
Test sockets at the front panel allow easy measurement of
the output voltage.
Power Down
The power down circuitry monitors the output voltage and
changes its output signal status from low to high impedance
when the output voltage falls below the low threshold level
and changes back to low impedance, when the output volt-
age exceeds the upper threshold level. The rectifier ver-
sions have a relatively small hysteresis of 1 V, the battery
charger versions have a large hysteresis. The upper
threshold level is given the low threshold level is externally
adjustable at the D set pin 32. Power Down can for example
be used as a save data signal, for low voltage warning, as a
low battery signal to avoid deep discharge of the battery
during long term mains failure or to prevent connected con-
verters from starting-up at a low bus voltage. For applica-
tion examples see figures below for power down use.
As it is driven from the output, power down operates inde-
pendently of the input voltage and load conditions, even if
the unit is inhibited.
The standard version monitors the output voltage internally
(see fig.:
Standard version; Power down signal monitoring
directly the output of the T unit).
Vo+
Vo–
D set
T 1000-7
Rext
External adjustment
of the threshold
level Ut
R
–
+
06050
12
22
32
43.2 k
(21.5 k
)
Fig. 26
Standard version; Power down signal monitoring directly
the output of the T unit.
Vo+
Vo–
D set
T 1000-7D
Rext
External adjustment of
the threshold level Ut
R
43k2
(21k5)
–
+
F
06051
12
22
32
Fig. 27
With Option D; Power down signal monitoring the power
bus decoupled by a fuse.
Lower threshold level
With the resistor (
Rext) connected to D set input pin 32 and
Vo- (or Vo+) the low threshold level can be increased (or
decreased) respectively. (See fig. above)
If the D set input is left open the low threshold level of the
power down signal is factory set to:
T 12xx:
Ut set = 21.0 V
±0.4 V
T 17xx:
Ut set = 42.5 V
±0.5 V
T 18xx:
Ut set = 32.0 V
±0.4 V
The approximate resistor values for given threshold levels
can be calculated from the following formulae; (
Ut in V):
With option D the output voltage can be sensed externally
for example to monitor the system bus decoupled from the
power supplies by diodes or fuses.
With option D a resistor of 43.2 k
1% (21.5 k for T 1840)
should be fitted externally into the sense line to the bus (see
fig.:
With option D; Power down signal monitoring...).
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