TDA8547TS Datasheet, PDF (5/20 Pages) NXP Semiconductors – 2 x 0.7 W BTL audio amplifier with output channel switching

Philips Semiconductors
2 × 0.7 W BTL audio amplifier with
output channel switching
Product specification
TDA8547TS
SELECT pin
If the voltage at the SELECT pin is in the range between
1.5 V and V_CC − 1.5 V, or if it is kept floating, then both
channels can be operational. If the SELECT pin is set to a
LOW voltage or grounded, then only channel 2 can
operate and the power amplifier of channel 1 will be in the
standby mode. In this case only the loudspeaker at
channel 2 can operate and the loudspeaker at channel 1
will be switched off. If the SELECT pin is set to a
HIGH level or connected to V_CC, then only channel 1 can
operate and the power amplifier of channel 2 will be in the
standby mode. In this case only the loudspeaker at
channel 1 can operate and the loudspeaker at channel 2
will be switched off. Setting the SELECT pin to a LOW or
a HIGH voltage results in a reduction of quiescent current
consumption by a factor of approximately 2.
Switching with the SELECT pin during operating is not
plop-free, because the input capacitor of the channel
which is coming out of standby needs to be charged first.
For plop-free channel selecting the device has first to be
set in mute condition with the MODE pin (between 1.5 V
and V_CC − 1.5 V), then set the SELECT pin to the new
level, after a delay set the MODE pin to a LOW level.
The delay needed depends on the values of the input
capacitor and the feedback resistors. Time needed is
approx. 10 × C1 × (R1 + R2), so approximately 0.6 s. for
the values in Fig.4.
Table 1 Control pins MODE and SELECT versus status of output channels
Voltage levels at control pins at V_P = 5 V; for other supply voltages see Figs. 14 and 15.
CONTROL PIN
STATUS OF OUTPUT
CHANNEL
MODE
HIGH⁽¹⁾/NC⁽²⁾
HVP⁽⁴⁾
LOW⁽⁵⁾
HVP⁽⁴⁾/LOW⁽⁵⁾
HVP⁽⁴⁾/LOW⁽⁵⁾
HVP⁽⁴⁾/LOW⁽⁵⁾
SELECT
X⁽³⁾
HVP⁽⁴⁾/NC⁽²⁾
HVP⁽⁴⁾/NC⁽²⁾
HIGH⁽¹⁾
HVP⁽⁴⁾/NC⁽²⁾
LOW⁽⁵⁾
CHANNEL 1 CHANNEL 2
standby
standby
mute
mute
on
on
mute/on
standby
mute/on
mute/on
standby
mute/on
Notes
1. HIGH = V_pin > V_CC − 0.5 V.
2. NC = not connected or floating.
3. X = don’t care.
4. HVP = 1.5 V < V_pin < V_CC − 1.5 V.
5. LOW = V_pin < 0.5 V.
TYP. I_q
(mA)
0
15
15
8
15
8
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
PARAMETER
V_CC
V_I
I_ORM
T_stg
T_amb
V_Psc
P_tot
supply voltage
input voltage
repetitive peak output current
storage temperature
operating ambient temperature
AC and DC short-circuit safe voltage
power dissipation
CONDITIONS
operating
MIN.
−0.3
−0.3
−
−55
−40
−
−
MAX.
+18
V_CC + 0.3
1
+150
+85
10
1.1
UNIT
V
V
A
°C
°C
V
W
1998 Apr 01
5