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参数资料
| 型号： | LT1201-7DFB1 |
| 厂商： | POWER-ONE INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 400 W AC-DC REG PWR SUPPLY MODULE |
| 封装： | CASE T01, MODULE |
| 文件页数： | 28/33页 |
| 文件大小： | 838K |
| 代理商： | LT1201-7DFB1 |
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T Series
AC-DC Converters >100 Watt
Rugged Environment
Edition 4/4.99
4/33
MELCHER
The Power Partners.
Functional Description
The T unit is a primary controlled AC-DC converter with a
constant switching frequency of 65.5 kHz. The power factor
corrected single step conversion of the line input voltage to
a low output voltage results in extremely high efficiency.
The input voltage is fed via input fuse, filter and rectifier to
the main transformer. The wideband input filter with small
input capacitance generates virtually no inrush current.
Transient suppressors protect the unit against high voltage
peaks and surges. An auxiliary converter generates an in-
ternal supply voltage for the primary control logic. The input
voltage waveform is sensed by the primary control logic to
allow power factor correction.
The main transformer is connected to a rectifier, large out-
put capacitors and an efficient output filter which ensures
low output ripple and spikes and provides the necessary
hold-up time. The output voltage is fed back to the primary
control logic via a signal transformer.
The inhibit signal and the T failure signal are transferred by
a second signal transformer (no opto-couplers!).
System Good and Output voltage OK are each indicated by
a green LED, inhibit and T System Failure by a red LED.
System Good and Power Down are available as open col-
lector signals at the connector. The threshold level of the
Power Down signal can be externally adjusted at the D set
input.
Test sockets at the front panel allow the measurement of
the output voltage.
The battery charger version provides additional features to
control the output voltage. To set it to different battery float
charge voltages, a 16-step selector switch (Z) is standard.
A control input for remote output voltage adjustment, by an
external temperature sensor is available at the multifunc-
tional inhibit/
Ucr control pin. A trim-potentiometer allows fine
adjustment of the output voltage.
4
6
10
P~
N~
Output
Filter
Isolation 4 kVrms
12
16
18
20
24
26
28
30
32
Vo+
Hot-plug +
Hot-plug –
Vo–
Sys In
Sys Out
i/Ucr
D
D set
Vo–
+
–
Cy
8
Input
Filter
Input
Filter
Input
Filter
Control
Circuit
Voltage
and
System
Monitor
Cy
Auxiliary
Converter
NTC
22
14
Fuse
Cy
P
Z
Cy
03043
Fig. 1
Block diagram
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