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参数资料
| 型号： | LKP5740-6R |
| 厂商： | POWER-ONE INC |
| 元件分类： | 电源模块 |
| 英文描述： | 2-OUTPUT 250 W AC-DC PWR FACTOR CORR MODULE |
| 封装： | HEAT SINK, METAL, CASE K02, MODULE |
| 文件页数： | 23/28页 |
| 文件大小： | 674K |
| 代理商： | LKP5740-6R |
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BCD20001-G Rev AB
Page 4 of 28
www.power-one.com
K Series with PFC Data Sheet
150 – 280 Watt AC-DC Converters
Fig. 2
Block diagram of double-output models
1
Transient suppressor (VDR)
2
Inrush current limiter (NTC, only models with TA min = –25 °C ), or option E
3
Input fuse
4
Bulk capacitor (Ci)
Functional Description
The input voltage is fed via an input fuse, an input filter, a
rectifier, and an inrush current limiter to a boost converter.
This step-up converter provides a sinusoidal input current
(IEC/EN 61000-3-2, class D equipment) and charges the
bulk capacitor Ci to approx. 370 VDC. This capacitor
sources a single-transistor forward converter and provides
the power during the hold-up time.
Each output is powered by a separate secondary winding
of the main transformer. The resultant voltages are rectified
and their ripple smoothed by a power choke and an output
filter. The control logic senses the main output voltage Vo1
and generates, with respect to the maximum admissible
output currents, the control signal for the switching
transistor of the forward converter.
The second output of double output models is tracking to
the main output, but has its own current limiting circuit. If
the main output voltage drops due to current limitation, the
second output voltage will fall as well and vice versa.
Fig. 1
Block diagram of single-output converters
1
Transient suppressor (VDR)
2
Inrush current limiter (NTC, only models with TA min = –25 °C ), or option E
3
Input fuse
4
Bulk capacitor (Ci)
Input
filter
Control
circuit
P
2
CY
16
18
20
22
12
4
6
8
10
14
CY
Output
filter
1
28
30
32
24
3
–
+
CY
Forward
converter
(approx.
80
kHz)
+
Boost
converter
( PFC
)
370
VDC
Ci 4
03001b
R
i
D/V
T
S+
Vo+
Vo–
S–
26
N~
L~
Input
filter
Control
circuit
1
P
2
16
18
20
22
12
14
4
6
8
10
Output
2
filter
Output
1
filter
26
28
30
32
24
3
–
+
CY
Forward
converter
(approx.
80
kHz)
Boost
converter
( PFC
)
+
370
VDC
Ci4
03002b
N~
L~
R
i
D
T
Vo1+
Vo1–
Vo2+
Vo2–
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|---|---|
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