Datasheet

MAX9742
Single-/Dual-Supply, Stereo 16W,
Class D Amplifier with Differential Inputs
26 ______________________________________________________________________________________
L
F
C
F
ON
OFF
C
VDD
C
VSS
I
AVG
I
AVG
V
SS
C
VSS
V
DD
L
F
C
F
ON
OFF
C
VDD
V
SS
V
DD
CASE 1: I
AVG
FLOWING INTO HALF-BRIDGE CAUSING VOLTAGE ACROSS C
VDD
TO INCREASE (DUTY CYCLE < 50%).
I
AVG
= AVERAGE (CONTINUOUS) OUTPUT CURRENT DURING ONE SWITCHING CYCLE.
I
PUMP
= AMOUNT OF CURRENT PUMPED INTO SUPPLY BYPASS CAPACITOR.
I
PUMP
= DUTY CYCLE x I
AVG
Figure 13a. Continuous Output Current Flow for Positive Supply Pumping
L
F
C
F
ON
OFF
C
VDD
C
VSS
I
AVG
I
AVG
V
SS
C
VSS
V
DD
L
F
C
F
ON
OFF
C
VDD
V
SS
V
DD
CASE 2: I
AVG
FLOWING OUT OF HALF-BRIDGE CAUSING VOLTAGE ACROSS C
VSS
TO INCREASE (DUTY CYCLE > 50%).
I
AVG
= AVERAGE (CONTINUOUS) OUTPUT CURRENT DURING ONE SWITCHING CYCLE.
I
PUMP
= AMOUNT OF CURRENT PUMPED INTO SUPPLY BYPASS CAPACITOR.
I
PUMP
= DUTY CYCLE x I
AVG
Figure 13b. Continuous Output Current Flow for Negative Supply Pumping