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| 型号： | RDK-242 |
| 厂商： | Power Integrations |
| 文件页数： | 17/40页 |
| 文件大小： | 0K |
| 描述： | KIT REF DESIGN VG TOPSWITCH-JX |
| 标准包装： | 1 |
| 系列： | TOPSwitch®-JX |
| 主要目的： | AC/DC，主面和辅面 |
| 输出及类型： | 1，隔离 |
| 功率 - 输出： | 30W |
| 输出电压： | 12V |
| 电流 - 输出： | 2.5A |
| 输入电压： | 85 ~ 264VAC |
| 稳压器拓扑结构： | 回扫 |
| 频率 - 开关： | 132kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | TOP266VG |
| 其它名称： | 596-1312 |
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TOP264-271
Very Low No-Load, High Efficiency, 30 W, Universal
Input, Open Frame, Power Supply
The circuit shown in Figure 26 below shows an 85 VAC to
265 VAC input, 12 V, 2.5 A output power supply. The goals of
the design were highest full load efficiency, average efficiency
(average of 25%, 50%, 75% and 100% load points), very low no-
load consumption. Additional requirements included latching
output overvoltage shutdown and compliance to safety agency
limited power source (LPS) limits. Actual efficiency and no-load
performance is summarized in the table shown in the schematic
which easily exceed current energy efficiency requirements.
In order to meet these design goals the following key design
decisions were made.
PI Part Selection
? Ambient of 40 °C allowed one device size smaller than
indicated by the power table
The device selected for this design was based on the 85-265 VAC,
Open Frame, PCB heat sinking column of power table (Table 1).
One device size smaller was selected (TOP266V vs TOP267V)
due to the ambient specification of 40 °C (vs the 50°C assumed
in the power table) and the optimum PCB area and layout for
the device heat sink. The subsequent thermal and efficiency
data confirmed this choice. The maximum device temperature
was 107°C at full load, 40 °C, 85 VAC, 47 Hz (worst case
conditions) and average efficiency exceeded 83% ENERGY
STAR and EuP Tier 2 requirements.
Transformer Core Selection
? 132 kHz switching frequency allowed the selection of smaller
core for lower cost
The size of the magnetic core is a function of the switching
frequency. The choice of the higher switching frequency of
132 kHz allowed for the use of a smaller core size. The higher
switching frequency does not negatively impact the efficiency in
TOPSwitch-JX designs due its small drain to source capacitance
(C OSS ) as compared to that of discrete MOSFETs.
Line Sense Resistor Values
? Increasing line sensing resistance from 4 M W to 10.2 M W to
reduce no-load input power dissipation by 16 mW
Line sensing is provided by resistors R1 and R2 and sets the
line undervoltage and overvoltage thresholds. The combined
value of these resistors was increased from the standard 4 M W
to 10.2 M W . This reduces the current into the V pin, and
therefore contribution to no-load input power, from ~26 mW to ~
10 mW. To compensate the resultant change in the UV threshold
resistor R12 was added between the CONTROL and VOLTAGE-
MONITOR pins. This adds a DC current equal to ~16 m A into
the V pin, requiring only 9 m A to be provided via R1 and R2 to
reach the V pin UV threshold current of 25 m A and setting the
UV threshold to approximately 95 VDC.
This technique does effectively disable the line OV feature as
the resultant OV threshold is raised from ~450 VDC to ~980 VDC.
However in this design there was no impact as the value of
input capacitance (C3) was sufficient to allow the design to
withstand differential line surges greater than 1 kV without the
peak drain voltage reaching the BV DSS rating of U1.
Specific guidelines and detailed calculations for the value of R12
may be found in the TOPSwitch-JX Application Note.
Input Voltage (VAC)
85
115
230
Full Load Ef?ciency (%)
Average Ef?ciency (%)
81.25 83.94 86.21
84.97 85.13
C11
1 nF
250 VAC
C12
1 nF R17
200 V 22 ?
No-load Input Power (mW)
60.8
61.98 74.74
VR1
P6KE180A
6
7,8
C14
680 μ F
25 V
C15
680 μ F
25 V
L2
3.3 μ H
C16
100 μ F
25 V
12 V, 2.5 A
25 V
D1
1N4007
D2
1N4007
R1
5.1 M ?
R3
10 M ?
R5
10 k ?
1/2 W
D5
FR107
C4
4.7 nF
1 kV
4
NC NC
D8,9
SB560
11,12
C7
47 μ F
1
D7
BAV21WS-
2 7-F
RTN
L1
14 mH
D3
1N4007
C3
82 μ F
400 V
D4
1N4007
R2
5.1 M ?
R4
10 M ?
D
V
D6
BAV19WS
R12
191 k ?
1%
T1
EF25
VR3
ZMM5245B-7
R9
10 ?
U2B
LTV817D
R18
110 ?
C18
47 nF
50 V
R19
470 ?
D10
LL4148
U2A
LTV817D
R21
86.6 k ?
1%
L
N
F1
3.15 A
85 - 264
VAC
C1
100 nF
275 VAC
R15
14.3 k ?
1%
TOPSwitch-JX
U1
TOP266VG
S
CONTROL
X F
C
C9
100 nF
50 V
R16
6.8 ?
1/8 W
C10
47 μ F
25 V
C20
33 nF
50 V
U3
LMV431A
1%
R23
10 k ?
1%
PI-5775-030810
Figure 26. Schematic of High Efficiency 12 V, 30 W, Universal Input Flyback Supply With Very Low No-load.
17
www.powerint.com
Rev. E 08/12
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