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| 型号： | RDK-242 |
| 厂商： | Power Integrations |
| 文件页数： | 15/40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
Application Example
Low No-Load, High Efficiency, 65 W, Universal Input
Adapter Power Supply
The circuit shown in Figure 25 shows a 90 VAC to 265 VAC
input, 19 V, 3.42 A output power supply, designed for operation
inside a sealed adapter case type. The goals of the design were
highest full load efficiency, highest average efficiency (average of
25%, 50%, 75% and 100% load points), and very low no-load
consumption. Additional requirements included latching output
overvoltage shutdown and compliance to safety agency limited
power source (LPS) limits. Measured 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
? One device size larger selected than required for power
delivery to increase efficiency
The current limit programming feature of TOPSwitch-JX allows
the selection of a larger device than needed for power delivery.
This gives higher full load, low-line efficiency by reducing the
MOSFET conduction losses (I RMS2 × R DS(ON) ) but maintains the
overload power, transformer and other components size as if a
smaller device had been used.
For this design one device size larger than required for power
delivery (as recommended by the power table) was selected.
This typically gives the highest efficiency. Further increases in
device size often results in the same or lower efficiency due to
the larger switching losses associated with a larger MOSFET.
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 R3 and R4 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 reduced the resistor dissipation, and therefore
contribution to no-load input power, from ~26 mW to ~10 mW. To
compensate the resultant change in the UV (turn-on) threshold
resistor R20 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 R3 and R4 to reach
the V pin UV (turn-on) threshold current of 25 m A and setting the
UV threshold to 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 (C2) was sufficient to allow the design to
withstand differential line surges greater than 2 kV without the
peak drain voltage reaching the BV DSS rating of U1.
Specific guidelines and detailed calculations for the value of
R20 may be found in the TOPSwitch-JX Application Note (AN-47).
Clamp Configuration – RZCD vs RCD
? An RZCD (Zener bleed) was selected over an RCD clamp to
give higher light load efficiency and lower no-load consumption
The clamp network is formed by VR2, C4, R5, R6, R11, R28,
R29 and D2. It limits the peak drain voltage spike caused by
leakage inductance to below the BV DSS rating of the internal
Input Voltage (VAC)
Full Power Ef?ciency (%)
Average Ef?ciency (%)
90
86.6
115
88.4
89.8
230
89.1
89.5
C11
1 nF
250 VAC
C12
1 nF R15
100 V 33 ?
No-load Input Power (mW)
57.7
59.7
86.7
VR2
SMAJ250A
T1
3 RM10 FL1
C13 C14
470 μ F 470 μ F
25 V 25 V
19 V, 3.42 A
R29
300 ?
4
R14
20 ?
4.7 k ?
R25
L
N
D1
GBU8J
600 V
L3
12 mH
R1 R2
2.2 M ? 2.2 M ?
C1
330 nF
275 VAC
L4
200 μ H
F1
4A
90 - 265
VAC
C2
120 μ F
400 V
R3
5.1 M ?
R4
5.1 M ?
R9
11 k ?
1%
R7
10 M ?
R8
10 M ?
R5
300 ?
R11
300 ?
C5
2.2 nF
1 kV
R24
2.2 ?
TOPSwitch-JX
U1
TOP269EG
D
S
C4
1000 pF
630 V
R6 R28
150 ? 300 ?
1
D2
RS1K
Q1
MMBT4403
D3
BAV19WS
C9
220 nF
25 V
R20
191 k ?
1%
V
CONTROL
C
X F
C6
100 nF
50 V
D5
V30100C
FL2
5
D4 C10
BAV21WS- 56 μ F
7-F 35 V
C15
470 pF
50 V
R10
100 ?
R12
U3B
PS2501-
1-H-A
VR1
ZMM5244B-7
Q2
MMBT3904
20 ?
1/8 W
R13
6.8 ?
1/8 W
C7
47 μ F
16 V
R16
20 k ?
U3A
PS2501-
1-H-A
C22
100 nF
50 V
R22
1.6 k ?
C19
6.8 nF
50 V
R17
147 k ?
1%
R27
10 k ?
C16
22 nF
50 V
R19
20 k ?
U2
LMV431AIMF
1%
C21
10 nF
50 V
R18
10 k ?
1%
RTN
PI-5667-030810
Figure 25. Schematic of High Efficiency 19 V, 65 W, Universal Input Flyback Supply With Low No-load.
15
www.powerint.com
Rev. E 08/12
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