DI-39 [POWERINT]
13 W, Universal Input DVD Supply with 70 mW No-load; 13 W，通用输入DVD电源70 mW的空载
| 型号： | DI-39 |
| 厂家： | 
Power Integrations |
| 描述： | 13 W, Universal Input DVD Supply with 70 mW No-load |
| 文件： | 总2页 (文件大小：500K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
Design Idea DI-39
®
TOPSwitch-GX 13 W, Universal
Input DVD Supply with 70 mW No-load
Topology
Device
Power Output
Input Voltage
Output Voltage
Application
3.3 V / 5 V / 12 V / -12 V
Flyback
DVD
13 W (17 W pk)
85-265 VAC
TOP244P
Design Highlights
• High efficiency multi-ouptut flyback (77% minimum)
• Topology scalable to higher powers
The supply operates at full frequency at high and medium
power and reduces frequency at light loads. Components D9
and C10 rectify and filter the bias voltage.
• Excellent cross-regulation
TOPSwitch-GX frequency jitter allows conducted EMI
compliance without a common-mode choke, using only
capacitors C1, C4 and inductor L1 as an EMI filter.
• Excellent input no-load consumption <70 mW input
• 132 kHz switching frequency allows smaller transformer
• Frequency jitter eliminates common-mode EMI choke
• >10 dB margin against CISPR22-B conducted EMI with
artificial hand grounding
Components D5 and C2 form a capacitor clamp circuit
absorbingleakageinductanceenergyduringnormaloperation.
ZenerVR1clampsthevoltagetoasafelevelduringabnormal
and transient conditions. After clamping, reverse current
flows through D5, recovering some of the energy. Resistor
R5 limits the reverse current and, with R7, improves EMI by
limitingtheringingonthedrain. Continuousmodeoperation
allows reduced primary and secondary peak currents,
optimizing cross regulation and load regulation by
minimizing leakage inductance induced voltage shifts.
Operation
The TOPSwitch-GX uses current mode feedback to achieve
excellentno-loadstandby.ComponentsC16,R1andQ2provide
a constant current powering the TOPSwitch-GX CONTROL
pin. ResistorR2feedstheremainderofQ2currenttotheMpin,
reducing TOPSwitch-GX current limit with increased current.
Resistor R11 sets the maximum current limit of the device.
Components R6, Q1 and C13 implement slope compensation.
Resistors R15 and R16 share the feedback from the 3.3 V
and 5 V outputs for good cross-regulation.
C8
1 nF
Y1
L2
3.3 µH
D1-D4
1N4005
12 V, 400 mA
C15
C20
L3
F1
VR1
P6KE180
D7
UF4003
470 µF
150 µF
3.3 µH
3.15 A
R7
100 Ω
5 V, 1.6 A
3.3 V, 700 mA
RTN
25 V
250 VAC
25 V
C1
33 µF
400V
C4
33 µF
400V
C11
D11
L4
C2
0.01 µF
1 KV
C3
0.047 µF
x2
1800 µF
85 - 265
VAC
1N5822
3.3 µH
25 V
C12
1000 µF
10 V
C18
C17
470 µF
10 V
R9
200 Ω
D10
1N5822
470 µF
R5
47 Ω
10 V
C9
C6
D8
UF4003
U2B
PC817
D5
1N4007
220 µF
220 µF
25 V
25 V
R8
1 kΩ
R16
6.34 kΩ
R15
20 kΩ
R12
1 1/2 W
PC817
U2A
R10
3.3 kΩ
C14
0.1 µF
R6
20 kΩ
R1
C7
10 µF
50 V
U3
TL431CLP
C16
0.33 µF
270 Ω
R13
10 kΩ
TOPSwitch-GX
U1
TOP244P
R2
Q1
2N3906
Q2
2N3906
20 kΩ
- 12 V, 100 mA
D
S
M
D9
C10 1N4148
47 µF
CONTROL
C
C13
47 pF
R11
7.5 kΩ
50 V
R14
6.8 Ω
L1
1.4 µH
0.5 A
C19
0.1 µF
C5
47 µF
10 V
PI-3321-111902
Figure 1. TOPSwitch-GX DVD Player Schematic.
.
November 2002
DI-39
www.powerint.com
DI-39
Key Design Points
TRANSFORMER PARAMETERS
• Use of foil for the 3.3 V and 5 V windings also helps to
optimize cross-regulation.
• Optional capacitor C7 is the “soft-finish” capacitor and
prevents overshoot on startup.
EEL25
Core Material
Himag MZ4 EEL25.4, Taiwan AL of
344 nH/T2
Bobbin
EEL25 Vertical 14 Pins
• Compact layout for components D7, D10, D11, C11,
C12, C15 will improve cross-regulation and efficiency.
Compact layout for L2, L3, L4, C17, C18, and C20 will
achieve best output ripple.
• Figure 2 shows conducted EMI at 230 VAC full load, with
output“ArtificialHand”grounding. Floatingoutputreturn
gives lower results.
Shield: 32T x 2 x 32 AWG
Primary: 64T x 2 x 32 AWG
Bias: 10T x 4 x 32 AWG
Shield: 2T x 8 x 32 AWG
+3.3V: 4T x foil 0.052 x 14 mm
+5V: 1T x foil 0.052 x 14 mm
+12V: 4T x 4 x 32 AWG
-12V: 7T x 4 x 32 AWG
Winding Details
• Table 2 shows the cross regulation of the supply over load
for both 115 VAC and 230 VAC.
Shield (NC-5), tape, Primary (1-4), tape,
Bias (7-6), tape, Shield (5-NC), tape,
+12 V (13-8), +3.3 V (11,12-9,10), +5 V
(9-10,13), tape, -12 V (14-11, 12), tape
Winding Order
(Pin Numbers)
80
70
Primary Inductance
(Pins 1-4 all others
open)
1.42 mH ±10% at 132 kHz
QP
AV
Quasi Peak
60
50
40
Primary Resonant
Frequency
300 kHz minimum
Leakage Inductance
30 µH maximum
30
20
Table 1. Transformer Construction Information.
10
Output Load
Cross Regulation (%)
Range
(%)
Voltage
(V)
0
-10
-20
Average
-4
-3
-2 -1
0
1
2
3
4
3.3
5
12
-12
10-100
10-100
10-100
100
0.15
1.0
10.0
-100.0
MHz
Table 2. Worst Case Cross Regulation at 115 VAC and 230 VAC.
Figure 2. EMI at 230 VAC Full Load with "Artificial Hand"
Grounding of Output.
For the latest updates, visit our Web site: www.powerint.com
Power Integrations reserves the right to make changes to its products at any time to improve reliability or manufacturability.
Power Integrations does not assume any liability arising from the use of any device or circuit described herein, nor does it convey any
license under its patent rights or the rights of others. The products and applications illustrated herein (including circuits external to the
products and transformer construction) may be covered by one or more U.S. and foreign patents or potentially by pending U.S. and foreign
patent applications assigned to Power Integrations. A complete list of Power Integrations’ patents may be found at www.powerint.com.
The PI Logo, TOPSwitch, TinySwitch, LinkSwitch and EcoSmart are registered trademarks of Power Integrations, Inc.
PI Expert is a trademark of Power Integrations, Inc. ©Copyright 2002, Power Integrations, Inc.
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A
11/02
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