MS6863_1 Datasheet, PDF (11/14 Pages) MOSA ELECTRONICS – Dual 2W Power Amplifiers / Stereo Headphone Low Voltage, Pop Noise Free Function

MOSA
MS6863
Dual 2W Power Amplifiers with Stereo Headphone
HP-IN operation
The ability of the MS6863 is easily switched between dual BTL and stereo SE modes. The mode is switched by the
headphone control pin, HP-IN. A logic-high activates the SE mode when a set of headphone plugged into the system,
on the other hand, a logical-low to HP-IN activates the BTL mode when no headphones. Please note that this HP-IN
voltage is a hysteresis voltage, the control voltage range is 0.4V_DD to 0.6 V_DD.
SHUTDOWN mode
SD places the entire device in shutdown mode when held high.
Thermal pad considerations
The thermal pad must be connected to ground. The package with thermal pad of the MS6863 requires the special
attention on thermal design. The thermal pad on the bottom of the MS6863 should be soldered down to a copper pad on
the circuit board. Heat can be conducted away from the thermal pad through the copper plane to ambient. If the copper
plane is not on the top surface of the circuit board, 9 vias of 13 mil or smaller in diameter should be used to thermally
couple the thermal pad to the bottom plane. For good thermal conduction, the vias must be plated through and solder
filled.
Pop noise free example
Use extra function of pin7 and control timing.
V_INA
V_INB
1uF
20k
R_IN
4.7uF
1uF
20k
R_IN
MCU
V_DD ^100k
100k
0.1uF
6 _-INA
8 _+INA
14 _BYPASS
13 _+INB
15 _-INB
1 _SD
7 _SDPR
20 _HP-IN
20K
R_F
MS6863
5
-OUTA
3
+OUTA
100uF
R_L
8Ω
1k
V_DD
VDD ^4,17
1uF
GND
2,19
9,10,11,12
-OUTB ¹⁶
+OUTB ₁₈
100uF
R_L
8Ω
1k
20K
R_F
Fig.2 A pop noise free application circuit.
Headphone Jack
REV 4
SDPR (Pin7)
Shutdown
Delay time
0.1s
Fig.3 A control timing for pop noise free
11/14
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