DI-39 View Datasheet(PDF) - Power Integrations, Inc
Part Name
Description
MFG CO.
'DI-39' PDF : 2 Pages View PDF
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Design Idea DI-39
®
TOPSwitch-®GX 13 W, Universal
Input DVD Supply with 70 mW No-load
Application
DVD
Device
TOP244P
Power Output
13 W (17 W pk)
Input Voltage
Output Voltage
Topology
85-265 VAC 3.3 V / 5 V / 12 V / -12 V Flyback
Design Highlights
• High efficiency multi-ouptut flyback (77% minimum)
• Topology scalable to higher powers
• Excellent cross-regulation
• 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
Operation
The TOPSwitch-GX uses current mode feedback to achieve
excellent no-load standby. Components C16, R1 and Q2 provide
a constant current powering the TOPSwitch-GX CONTROL
pin. Resistor R2 feeds the remainder of Q2 current to the M pin,
reducing TOPSwitch-GX current limit with increased current.
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.
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.
Components D5 and C2 form a capacitor clamp circuit
absorbing leakage inductance energy during normal operation.
Zener VR1 clamps the voltage to a safe level during abnormal
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
limiting the ringing on the drain. Continuous mode operation
allows reduced primary and secondary peak currents,
optimizing cross regulation and load regulation by
minimizing leakage inductance induced voltage shifts.
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.
85 - 265
VAC
F1
3.15 A
250 VAC
D1-D4
1N4005
C3
0.047 µF
x2
C8
1 nF
Y1
C1
33 µF
400V
VR1
P6KE180
C4
33 µF
400V
R7
100 Ω
C2
0.01 µF
1 KV
R5
47 Ω
D5
1N4007
D7
UF4003
C15
470 µF
25 V
D11
1N5822
C11
1800 µF
25 V
D10
1N5822
C12
1000 µF
10 V
D8
UF4003
C9
220 µF
25 V
C6
220 µF
25 V
PC817
U2A
R12
1 1/2 W
L1
1.4 µH
0.5 A
R11
7.5 kΩ
R1
270 Ω
TOPSwitch-GX
U1
TOP244P
R2
20 kΩ
C16
0.33 µF
Q2
2N3906
R6
20 kΩ
Q1
2N3906
D
M
CONTROL
C
S
C19
0.1 µF
C13
47 pF
R14
6.8 Ω
C5
47 µF
10 V
D9
C10 1N4148
47 µF
50 V
L2
3.3 µH
L3
3.3 µH
L4
3.3 µH
R9
200 Ω
U2B
PC817
R8
1 kΩ
C17
470 µF
10 V
R16
6.34 kΩ
C14 R10
0.1 µF 3.3 kΩ
C7
10 µF
50 V
U3
TL431CLP
R13
10 kΩ
C20
150 µF
25 V
C18
470 µF
10 V
R15
20 kΩ
12 V, 400 mA
5 V, 1.6 A
3.3 V, 700 mA
RTN
- 12 V, 100 mA
DI-39
PI-3321-111902
Figure 1. TOPSwitch-GX DVD Player Schematic.
.
www.powerint.com
November 2002
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