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IRAUDAMP5 REV 3.1
frequencies of 400 kHz and greater; lower switching frequencies may require additional filter
components.
+VCC is referenced to –B and provides the supply voltage to the LO gate driver. D6 and C5 form
a bootstrap supply that provides a floating voltage to the HO gate driver. The VAA and VSS
input supplies are derived from +B and -B via R52 and C18, and R50 and C12, respectively.
Thus, a fully functional Class D PWM amplifier plus driver circuit is realized in an SO16
package with just a few small components.
+
-
.
.
.
R13
IN-
COMP
C23
.
R33
-VSS
+VAA
IRS2092S
LO
VS
VCC
C5
D6
VB
0V
0V
C1
R2
1
C1
7
R52
C3
HO
C23A
INPUT
C21
R31
C12
R50
+VCC
Integrator
COM
R30
Modulator
and
Shift level
GND
0V
-B
DirectFet
0V
LP Filter
L1
DirectFet
C18
R32
+B
IRF6645
Q4
IRF6645
Q3
Simplified Block Diagram of IRAUDAMP5 Class D Amplifier
Fig 10
System overview
IRS2092S Gate Driver IC
The IRAUDAMP5 uses the IRS2092S, a high-voltage (up to 200V), high-speed power MOSFET
PWM generator and gate driver with internal dead-time and protection functions specifically
designed for Class D audio amplifier applications. These functions include OCP and UVP. Bi-
directional current protection for both the high-side and low-side MOSFETs are internal to the
IRS2092S, and the trip levels for both MOSFETs can be set independently. In this design, the
dead time can be selected for optimized performance by minimizing dead time while preventing
shoot-through. As a result, there is no gate-timing adjustment on the board. Selectable dead time
through the DT pin voltage is an easy and reliable function which requires only two external
resistors, R11 and R9 as shown on Fig11 below.
Summary of Contents for IRAUDAMP5
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