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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： | 14/33页 |
| 文件大小： | 838K |
| 代理商： | LT1702-7D |
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Rugged Environment
AC-DC Converters >100 Watt
T Series
Edition 4/4.99
21/33
MELCHER
The Power Partners.
Auxilliary Functions
Connection in Parallel and in Series
The output of the T units may either be connected in series
or in parallel.
Connection in parallel: Current sharing between paralleled
units is ensured by the output characteristic slope. Several
T units may be connected in parallel.
Connection in series: A maximum of 2 T units may be con-
nected in series, however the resulting output voltage of up
to 110 V would no longer be SELV. For safety reasons the
installation at the output should be protected with supple-
mentary insulation (IEC/EN 60950).
Power Boosting, Redundant Configuration,
Hot Plug-in
For redundant configurations the outputs should be de-
coupled to protect the DC-bus in case of an internal short
circuit at the output of any of the paralleled T units.
Decoupling may either be done using series diodes or us-
ing appropriate fuses in the output path of each T unit. If the
battery voltage is to be monitored, choose T units with op-
tion D.
Decoupling diodes provide reverse polarity protection with
no reverse current in case of hot plug-in, but have the dis-
advantage of the forward voltage drop over the diode and
higher power loss.
For battery applications decoupling of the T units with fuses
is recommended since the voltage drop over the decoup-
ling diodes would decrease the float charge voltage of the
battery. In case of an internal short circuit at the output of a
charger unit the battery will deliver a very large current
causing the respective fuse to blow. The fuse should be
mounted in the positive power path of the converter since
the monitoring signals of the T units are referenced to the
negative path. The fuse type should be suitable for DC ap-
plication having a current rating of 20 A or more with high
breaking capability, e.g. Littlefuse, series 314.
Several T xx40 battery charger units connected in parallel
can be controlled by a single voltage source or a single sen-
sor wired to the remote control inputs. If sensors are con-
nected in parallel (redundant configuration), they should be
decoupled by 200 k
resistors, (see fig.: Sensors con-
nected in parallel). An individual sensor for each paralleled
T unit is not recommended because current sharing is af-
fected by the sensor tolerance.
The remote control input of the T xx40 units allows hot plug-
in to an operating battery system with a single sensor with-
out affecting the float charge voltage.
Fig. 38
Sensors connected in parallel.
Sensors in parallel provide redundant voltage adjustment
in case of one of the sensors in open circuit or short circuit
(add. external components required)
Vo+
Vo–
i/Ucr
T xx40
Sensor
200 k
12
22
28
06078
+
–
T 1000
Vo
–
Vo+
Vo
–
Vo+
06077
Fig. 39
T unit without battery back-up in redundant configuration
To enable hot plug-in in systems decoupled with fuses the T
series is fitted with an NTC resistor limiting the reverse cur-
rent flowing into the discharged output capacitors (see:
Functional Description).
For this purpose the pins 16 and 18 have to be connected
to Vo+ and Vo– respectively (see fig.:
T xx40 with battery
back-up).
Since pins 16 and 18 are leading pins, the output capacitors
are precharged through the internal NTC resistor prior to
any other pin making contact. This protects the connector
and prevents the DC bus voltage from dropping during hot
plug-in. Hot plugging should be done gently. Subsequent
hot plug-out/plug-in of a unit with a hot NTC should be
avoided as current limiting will be poor. After disconnecting
an operating unit it should be cooled down prior to recon-
necting to the bus to avoid damage of the fuse or the con-
verter.
Note: The internal NTC limits the reverse charge current
flowing into the output capacitors of a T unit when it is
plugged into a battery buffered bus. Should however the T
unit already be connected when the battery is switched to
the bus, the resulting charge current will not be limited. To
avoid the fuse to blow or a possible arc across the circuit
breaker, the T units should be switched on to the mains
prior to connecting the battery. With decoupling diodes, no
reverse charge current flows from the power bus into the T
output capacitors.
+
–
Vo
–
Vo+
Vo
–
Vo+
T xx40
HC
–
HC+
HC
–
Fuse
+
–
D set
R
43k2
R
43k2
D set
(21k5)
06079
Fig. 40
T xx40 with battery back-up. Power Down signal monitor-
ing the battery voltage.
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