|
International Rectifier's power semiconductor
chipsets for Class D amplifiers include HEXFET® power MOSFETs and
high speed gate driver ICs. The ICs and MOSFETs in the selector
guides below have been specifically matched for use with Class D
power amplifier controller IC.
Today, most audio applications use Class AB linear amplifiers.
The emerging trend is to move to digital amplifiers, which offer a
number of benefits over the traditional linear solution. With a
higher efficiency, digital amplifiers are smaller, lighter,
streamlined, cool and quiet with extended battery life compared to
the power hungry analog devices.
International Rectifier has leveraged its applications expertise
in switching mode power supplies along with its advanced MOSFET
technology to offer high performance MOSFETs for Class D amplifiers.
In the Class D amplifier topologies, which evolved from switch mode
power supplies, dead time control is critical to reduce total
harmonic distortion (THD) and provide high audio quality.
The HEXFET MOSFETs selected for Class D amplifiers offer
switching speeds up to 1MHz, without any compromise in efficiency,
thanks to their low gate-to-drain charge (QGD), output
capacitance (COSS) and on resistance (RDS(on)). These
MOSFETs minimize conduction and switching losses to improve the
efficiency of Class D amplifiers. The industry norm efficiency for
Class AB amplifier with bipolar transistors averages 50%. IR audio
power chipset combined with Class D amplifier controller deliver a
breakthrough efficiency of over 90%.
The low output capacitance and soft and fast recovery diode of
the HEXFET MOSFETs enhance Class D amplifier to significantly reduce
distortions in sound output. The gate driver IC combines, in a
single chip, most of the functions to drive the MOSFETs and provides
very fast switching speeds and low power dissipation.
Enhanced efficiency allows manufacturers to dramatically shrink
the size of a typical audio amplifier by a factor of four. Better
efficiency also translates in weight and system cost reduction. The
size reduction increases product design creativity, allowing the
amplifier to be built into a speaker or other unit, such as set-top
boxes and DVD players. Increased efficiency also enables
battery-powered amplifiers that can run up to three times as long
compared to conventional amplifiers.
SPECIFICATIONS
|
HALF BRIDGE
TOPOLOGY, 4W
LOAD |
|
Output RMS
Power |
Part
Number |
Max. Recommended
Rail
Voltage |
Recommended
Gate
Driver |
|
25W |
|
+/- 17V |
- |
|
30W |
|
+/- 18V |
- |
|
35W |
|
+/- 20V |
|
|
50W |
|
+/- 24V |
|
|
100W |
|
+/- 33V |
|
|
150W |
|
+/- 41V |
|
|
200W |
|
+/- 47V |
|
|
250W |
|
+/- 53V |
|
|
400W |
|
+/- 67V |
|
|
500W |
|
+/- 74V |
|
|
1000W |
|
+/- 105V |
|
|
HALF BRIDGE
TOPOLOGY, 8W
LOAD |
|
Output RMS
Power |
Part
Number |
Max. Recommended
Rail
Voltage |
Recommended
Gate
Driver |
|
25W |
|
+/- 24V |
- |
|
30W |
|
+/- 26V |
|
|
35W |
|
+/- 28V |
|
|
50W |
|
+/- 33V |
|
|
100W |
|
+/- 47V |
|
|
150W |
|
+/- 58V |
|
|
200W |
|
+/- 67V |
|
|
250W |
|
+/- 74V |
|
|
400W |
|
+/- 94V |
|
|
500W |
|
+/- 105V |
|
|
FULL BRIDGE
TOPOLOGY, 4W
LOAD |
|
Output RMS
Power |
Part
Number |
Max. Recommended
Rail
Voltage |
Recommended
Gate
Driver |
|
25W |
|
17V |
- |
|
30W |
|
18V |
- |
|
35W |
|
20V |
- |
|
50W |
|
24V |
|
|
100W |
|
33V |
|
|
150W |
|
41V |
|
|
200W |
|
47V |
|
|
250W |
|
53V |
|
|
400W |
|
67V |
|
|
500W |
|
74V |
|
|
1000W |
|
105V |
|
|
2000W |
|
149V |
|
|
FULL BRIDGE
TOPOLOGY, 8W
LOAD |
|
Output RMS
Power |
Part
Number |
Max. Recommended
Rail
Voltage |
Recommended
Gate
Driver |
|
25W |
|
24V |
- |
|
30W |
|
26V |
|
|
35W |
|
28V |
|
|
50W |
|
33V |
|
|
100W |
|
47V |
|
|
150W |
|
58V |
|
|
200W |
|
67V |
|
|
250W |
|
74V |
|
|
400W |
|
94V |
|
|
500W |
|
105V |
|
|
1000W |
|
149 |
|
|
2000W |
|
210V |
| Note:
Switching frequency up to 400kHz, max. modulation index M=85%
For more information:
Contact the Technical
Assistance Center or your local Sales
Rep. |