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| 型號(hào)： | LX1722-150EVALKIT |
| 英文描述： | AudioMAX Products |
| 中文描述： | AudioMAX產(chǎn)品 |
| 文件頁數(shù)： | 7/14頁 |
| 文件大?。?/td> | 357K |
| 代理商： | LX1722-150EVALKIT |
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 7
Copyright
2000
Rev. 0.1b,2001-09-19
W
M
.
C
AudioMAX
LX1721 / 1722
Class-D Stereo Power Amplifier Controller
P
RELIMINARY
L I N F I N I T Y D I V I S I O N
A P P L I C A T I O N I N F O R M A TI O N
Frequency Synchronization
Two or more LX1721 / LX1722 oscillators can be configured for
synchronous operation. One unit, the master, is programmed for
the desired frequency with the R
PWM
and C
PWM
as usual.
Additional units will be slave units, and their oscillators will be
disabled by leaving the R
PWM
pin disconnected. The CLOCK pin
and the C
PWM
pin of the slave units should be tied to the CLOCK
pin and the C
PWM
pin of the master unit respectively. In this
configuration, the CLOCK pins of the slave units begin receiving
instead of transmitting clock pulses. Also, the C
PWM
pins quit
driving the PWM capacitor in the slave units. Note that for
optimum performance, all slave units should be located within a
few inches of the master unit.
Oscillator Configuration
(R
PWM
and C
PWM
selection)
The oscillator is programmed by the external timing components
R
PWM
and C
PWM
. For a nominal frequency of 333kHz, R
PWM
and
C
PWM
should be set to 49.9kOhms and 100pF respectively. Note
that in order to keep the slope of the PWM ramp voltage
proportional to the supply voltage, both the ramp peak and valley
voltages, and the charge and discharge currents are proportional to
the supply voltage. This keeps the frequency relatively constant
while keeping the slope of the PWM ramp proportional to the
voltage on the VDD pin. For operating frequencies other than
333kHz, the frequency can be approximated by the following
equation:
ns
C
R
PWM
PWM
320
)
)(
)(
577
.
1
Frequency
+
=
A
P
P
L
I
C
A
T
I
O
N
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