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PDF DI35 Data sheet ( Hoja de datos )
| Número de pieza | DI35 | |
| Descripción | 16 W Audio Amplifier Power Supply | |
| Fabricantes | ETC | |
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Design Idea DI-35
TOPSwitch-®GX
16 W Audio Amplifier Power Supply
Application
Audio Amplifier
Device
TOP245P
Power Output Input Voltage
16 W (35 W Peak) 85-265 VAC
Output Voltage
16 V
Topology
Flyback
Design Highlights
• No heatsinks required!
• 77% efficiency (min), @ 85 VAC input/35 W output
• Low no-load input power: < 0.7 W @ 230 VAC input
• Low component count: 37, excluding I/O connectors
• Stable operation with or without 10,000 µF output buffer
capacitor
• Robust transformer design enables 35 W peak power
• Meets CISPR22B EMI with > 10 dB of margin
• Ideal for both class AB and class D audio amplifiers
Operation
Many of the built-in TOPSwitch-GX features have been used to
reduce the component count, transformer size, and overall cost
of this universal input flyback power supply. Designed around
a TOP245P (DIP-8 package), the device uses PCB copper for
its heatsink, eliminating the costs of both a heatsink and the
installation labor. Output diode D7 is also cooled the same way.
Resistors R1 and R2 set the nominal Under-Voltage (UV)
lockout and Overvoltage (OV) shutdown limits to 84 V and
378 V, respectively. UV lockout protects the supply from
overheating at low line and eliminates power-up and power-
down glitches. OV shutdown protects the power supply from
line surges.
The EMI filter has been significantly simplified to three
components (L1, CX1 and CY1), thanks to the built-in
frequency jitter function of the TOPSwitch-GX family.
The RCD network of C4, R3, R4, and D5 limits (clamps) the
peak voltage that the U1-DRAIN sees. A glass-passivated
normal recovery diode (D5) recycles stored leakage energy,
increasing overall efficiency. DRAIN ringing is dampened
by R4 (which is necessary when a normal recovery diode is
used).
The bias winding provides operating power and feedback
current to the CONTROL pin of U1. The U2-LED, R8 and
VR1 comprise the feedback circuit that senses the output
voltage. The current through the U2-LED regulates the
output voltage, by modulating the feedback current that
flows into the CONTROL pin of U1.
Key Design Points
• Ensure that the control loop has enough phase margin
at the extremes of the rated input voltage and output
load, both with and without the output buffer capacitor.
• A 5% VR1 should be acceptable for an audio amplifier.
Greater accuracy will require a 2% VR1.
• OV and UV thresholds are determined by: VOV =
225
µA
x
(R1+R2)
and
V
UV
=
50
µA
x
(R1+R2).
D1 & D2
1N4007
D3 & D4
1N4007
L1
6.8 mH
0.8 A
CX1
220 nF
250 VAC
F1
3.15 A
250 V
85-265
VAC
R3 C4
200 k 1 nF
1/2 W 1 KV
CY1
2.2 nF
(Safety)
1 9, 10
R6 C6
33 Ω 470 pF
1/4 W 100 V
L2
3.3 uH
C1
100 µF
400 V
R1
1M
R2
1M
3
R4
33 Ω
1/4 W
D5
IN4007G
TOPSwitch-GX
DM
U1
TOP245P
CONTROL
C
D7
SB5100
6, 7
R7
4 10 Ω
5
T1
D6
BAV20
C7 C8
470 µF 470 µF
25 V
C5
1 µF
25 V R8
150 Ω
50 V
U2
PC817A
U2 U2
R10
1k
R5
S C2 3.3 Ω
100 nF
50 V
C3
100 µF
16 V
VR1
IN5244B
5%
LN
Figure 1. Audio Amplifier Power Supply.
C9
100 µF
25 V 16 V, 1 A / 2.2 A
RTN
C10
47 µF
25 V
PI-3731-012604
DI-35
www.powerint.com
March 2004
1 page | ||
| Páginas | Total 2 Páginas | |
| PDF Descargar | [ Datasheet DI35.PDF ] | |
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