DI-41 [POWERINT]
43 W, 100/115 VAC Multi-output Set-top Box Power Supply; 43 W， 100/115 VAC多路输出机顶盒电源
| 型号： | DI-41 |
| 厂家： | 
Power Integrations |
| 描述： | 43 W, 100/115 VAC Multi-output Set-top Box Power Supply |
| 文件： | 总2页 (文件大小：68K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
Design Idea DI-41
TOP S w it c h®-GX 43 W, 100/115 VAC
Multi-output Set-top Box Power Supply
Topology
Device
Power Output
Input Voltage
Output Voltage
Application
Flyback
Set-top Box
43 W cont. / 57 W pk 90-132 VAC
TOP247Y
3.3 V, 5 V, 12 V, 18 V, 33 V
Design Highlights
Operation
• Low cost, low component count solution
• Excellent output voltage tracking and cross-regulation - no
linear regulators required
• High efficiency, >71% at 90 VAC
• Line undervoltage detection (UV) and power system surge
protection (OV)
• Meets CISPR22B/EN55022B conducted EMI limits
• Differential and common mode surge immunity to 4 kV
(EN61000-4-5)
The design in Figure 1 utilizes the TOP247Y and takes
advantage of many of the TOPSwitch-GX features. Line UV
and OV (100 V and 450 V, respectively) are implemented
using a single 2 MΩ resistor (R1). Undervoltage eliminates
output glitches and overvoltage provides protection for both
short duration transients and long duration power system
surges. Resistor R4 programs the internal current limit of U1
to 80% of nominal, limiting overload power.
• 100 kHz ring wave immunity to 4 kV (IEEE C62.41)
Thekeyperformancecharacteristicofthecircuitshownisthe
excellent output voltage tracking and cross-regulation. Two
techniques are used to properly center the output voltages.
The extra voltage drop of the ultra-fast rectifier D10 (used
instead of a Schottky) centers the 5 V output at precisely 5 V
T1
R6
10 Ω
D7
UF4003
L6
33 µH, 0.2 A
33 V, 0.03 A
18 V, 0.5 A
14
13
12
C7
C8
L2
47 µF
50 V
D8
10 µF
50 V
3.3 µH, 5 A
UF5402
C9
C10
1000 µF
L3
12 V,
0.6 A/1.8 A pk
D9
UF5402
220 µF
25 V
3.3 µH, 5 A
25 V
L7
Bead
C11
390 µF
8
C12
100 µF
25 V
R14
35 V
5.6 kΩ
0.5 W
C24
0.1 µF
50 V
R15
10
Ω
L4
3.3 µH
5A
C5
1 nF
1 kV
R2
68 kΩ
2 W
5 V, 3.2 A
C6
2.2 nF
Y1
9
C13, C14
1200 µF
35 V
L5
C15
220 µF
16 V
D10
3.3 µH
1
BYV32-200
5A
3.3 V, 3 A
RTN
D1-D4
RL206
11
VR1
P6KE200
2 A, 800 V
C18
C22
0.1 µF
50 V
D11
MBR1045
C16, 17
220 µF
1200 µF
16 V
35 V
3, 4
10
D2
D4
D1
D3
D5
1N4937
R7
150 Ω
5
C2
C21
0.1 µF
50 V
150 µF
7
6
C3
1 µF
50 V
L1
200 V
D6
1N4148
U2
20 mH
1.3 A
R1
LTV817
2 MΩ
1/2 W
C1
R10
R12
18 kΩ
R8
R13
15 kΩ
1%
0.22 µF
9.53 kΩ
1 kΩ
X2
1%
C19
0.1 µF
50 V
TOP S w it c h -GX
D
S
L
RV1
275 V
CONTROL
U1
TOP247Y
14 mm
C
R9
3.3 kΩ
F1
R3
6.8 Ω
3.15 A
C3
0.1 µF
50 V
C20
22 µF
50 V
X
F
R4
9.09 k
1%
RT1
10 Ω
3.2 A
U3
TL431CLP
t°
C5
L
R11
47 µF
90 - 132
VAC
10 kΩ
16 V
1%
N
PI-3389-091702
Figure 1. TOPSwitch-GX 43 W Continuous, 57 W Peak Set-Top Box Power Supply.
September 2002
DI-41
www.powerint.com
DI-41
and DC stacking is used to improve the regulation of 12 V,
18V,and30Voutputs. FerritebeadL7isplacedinserieswith
the12V, 18Vand30Voutputwindingstoimprovecentering
and cross-regulation of these outputs.
TRANSFORMER PARAMETERS
ERL28, Nippon ceramic
NC-2H material or equivalent,
Core Material
gapped for ALG = 128 nH/T2
ERL28 vertical, 14 pins,
Jinbo Industrial
JB-0039 or equivalent
Frequency jittering provides large EMI margins with simple
filtering. Primarysoft-startminimizescomponentstressduring
start-up and a soft-finish capacitor (C20) eliminates start-up
output overshoot.
Bobbin
Primary: 30T + 23T, 25 AWG
Shield: 1T, 0.6" x 0.001" Cu foil
Bias: 7T, 2 x 27 AWG
3.3 V: 2T, 0.6" x 0.005" Cu foil
5 V: 1T, 0.6" x 0.005" Cu foil
12 V: 4T, 2 x 27 AWG
18 V: 3T, 2 x 27 AWG
33 V: 6T, 27 AWG
(2 x 27 AWG = Bifilar 27 AWG)
Key Design Points
Winding Details
• Use KRP (Ripple-to-peak current ratio) in the range of
0.4–0.6 for higher efficiency, and tighter cross-regulation.
Use VOR (reflected output voltage) of 90 V to 110 V for
optimum performance.
• PCB traces which carry high switching currents should be
short and wide to reduce EMI.
• Reduce leakage inductance and improve cross-regulation
by filling each winding layer across the entire width of the
bobbin.
Apply 3.2 mm tape margin to
both sides of bobbin
Primary (4-3), tape, Shield (1-NC),
tape, Bias (6-7), 3 x tape, 5 V (9-11),
3.3 V (11-10), tape, 12 V (12-8),
18 V (13-12), 33 V (14-13),
Winding Order
(Pin Numbers)
3 x tape, Primary (3-1), 3 x tape
• Resistor R14 provides a small amount of pre-load on the
33 V output to prevent peak charging due to leakage
spikes.
Primary: 356 µH,
Leakage: 11 µH (maximum)
Inductance
Primary Resonant
Frequency
• R5 and C5 reduce power dissipation in VR1.
650 kHz (minimum)
Load
Range
(Amp)
Voltage
(V)
Regulation (%)
Table 1. Transformer Design Parameters.
-8 -7 -6 -5 -4 -3 -2 -1
0
1
2
3
3.3
5
1-3
1-3.2
12
30
0.3-0.6
0.01-0.03
Table 2. Worst Case Output Cross Regulation - Outputs Taken
from Minimum to Maximum Load and Line from 85 VAC
to 132 VAC.
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 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, TOP S w it c h , Tin yS w it c h and Ec o S m a rt are registered trademarks of Power Integrations, Inc.
P I Ex p e rt is a trademark of Power Integrations, Inc. ©Copyright 2002, Power Integrations, Inc.
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