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參數(shù)資料
| 型號(hào)： | LT1840-7Z |
| 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)： | 23/32頁 |
| 文件大?。?/td> | 1000K |
| 代理商： | LT1840-7Z |
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BCD20023 Rev. AA, 3-Sep-2008
Page 3 of 32
www.power-one.com
T Series Data Sheet
500 Watt AC-DC Converters
Functional Description
The T Series AC-DC converters are primary controlled 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 converter against overvoltage and
surges. An auxiliary converter generates an internal supply
voltage for the primary control logic. The input voltage
waveform is sensed by the primary control logic to provide
active power factor correction.
The main transformer is connected to a rectifier, large output
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 are used !).
System Good and Output 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 collector
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 for 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 to control the output voltage by an external
temperature sensor is available at a control pin. A trim-
potentiometer allows fine adjustment of the output voltage.
4
6
10
L~
N~
Output
filter
Isolation
4
kV
AC
12
16
18
20
24
26
28
30
32
Vo+
HC+
HC –
Vo–
Sys In
Sys Out
i/Vcr
D
D set
Vo–
+
Cy
8
Input
filter
Input
filter
Input
filter
Control
logic
Voltage
and
system
monitor
Cy
Auxiliary
converter
NTC
22
14
Fuse
Cy
P
Z
Cy
03043a
–
Fig. 1
Block diagram
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