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PDF SA58637 Data sheet ( Hoja de datos )
| Número de pieza | SA58637 | |
| Descripción | 2 x 2.2W BTL audio amplifier | |
| Fabricantes | NXP Semiconductors | |
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SA58637
2 × 2.2 W BTL audio amplifier
Rev. 01 — 25 February 2008
Product data sheet
1. General description
The SA58637 is a two-channel audio amplifier in an HVQFN20 package. It provides
power output of 2.2 W per channel with an 8 Ω load at 9 V supply. The internal circuit is
comprised of two Bridge-Tied Load (BTL) amplifiers with a complementary PNP-NPN
output stage and standby/mute logic. The SA58637 is housed in a 20-pin HVQFN
package, which has an exposed die attach paddle enabling reduced thermal resistance
and increased power dissipation.
2. Features
I Low junction-to-ambient thermal resistance using exposed die attach paddle
I Gain can be fixed with external resistors from 6 dB to 30 dB
I Standby mode controlled by CMOS-compatible levels
I Low standby current < 10 µA
I No switch-on/switch-off plops
I High power supply ripple rejection: 50 dB minimum
I ElectroStatic Discharge (ESD) protection
I Output short circuit to ground protection
I Thermal shutdown protection
3. Applications
I Professional and amateur mobile radio
I Portable consumer products: toys and games
I Personal computer remote speakers
1 page  
NXP Semiconductors
SA58637
2 × 2.2 W BTL audio amplifier
8. Functional description
The SA58637 is a two-channel BTL audio amplifier capable of delivering 2 × 1.5 W output
power to an 8 Ω load at THD+N = 10 % using a 6 V power supply. It is also capable of
delivering 2 × 2.2 W output power to an 8 Ω load at THD+N = 10 % using a 9 V power
supply. Using the MODE pin, the device can be switched to standby and mute condition.
The device is protected by an internal thermal shutdown protection mechanism. The gain
can be set within a range of 6 dB to 30 dB by external feedback resistors.
8.1 Power amplifier
The power amplifier is a Bridge-Tied Load (BTL) amplifier with a complementary
PNP-NPN output stage. The voltage loss on the positive supply line is the saturation
voltage of a PNP power transistor and on the negative side the saturation voltage of an
NPN power transistor. The total voltage loss is < 1 V.
8.2 Mode select pin (MODE)
The device is in Standby mode (with a very low current consumption) if the voltage at the
MODE pin is greater than VCC − 0.5 V, or if this pin is floating. At a MODE voltage in the
range between 1.5 V and VCC − 1.5 V the amplifier is in a mute condition. The mute
condition is useful to suppress plop noise at the output, caused by charging of the input
capacitor. The device is in Active mode if the MODE pin is grounded or less than 0.5 V
(see Figure 6).
8.3 SELECT output configuration
The outputs differentially drives the speakers, so there is no need for coupling capacitors
(see Figure 3). If the voltage at the SELECT pin is in the range between 1.5 V and
VCC − 1.5 V, or if it is kept floating, then both channels are operational. If the SELECT pin
is set to a logic LOW or grounded, then only the right channel is operational and the left
channel is in Standby mode. If the SELECT pin is set to logic HIGH or connected to VCC,
then only the left channel is operational and right channel is in Standby mode. Setting the
SELECT pin to logic LOW or a logic HIGH voltage results in a reduction of quiescent
current consumption by a factor of approximately 2. Switching the SELECT pin during
operation 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 VCC − 1.5 V). The
SELECT pin is then set to the new level and after a delay the MODE pin is set to a LOW
level. The delay needed depends on the values of the input capacitors and the feedback
resistors. Time needed is approximately 10 × C1 × (R1 + R2), so approximately
0.6 seconds for the values shown in Figure 3.
Table 4. Control pins MODE and SELECT versus status of output channels
Voltage levels at control pins at VCC = 5 V; for other voltage levels see Figure 6 and Figure 7.
Control pin
Status of output channel
Typical Iq (mA)
MODE
SELECT
Left channel
Right channel
HIGH[1]/n.c.[2]
X[3]
standby
standby
0
HVCC[4]
HVCC[4]/n.c.[2]
mute
mute
15
LOW[5]
HVCC[4]/n.c.[2]
on
on
15
SA58637_1
Product data sheet
Rev. 01 — 25 February 2008
© NXP B.V. 2008. All rights reserved.
5 of 22
5 Page 
NXP Semiconductors
SA58637
2 × 2.2 W BTL audio amplifier
14.2 BTL dynamic characterization
The total harmonic distortion-plus-noise (THD+N) as a function of frequency (Figure 8)
was measured with a low-pass filter of 80 kHz. The value of capacitor C3 influences the
behavior of PSRR at low frequencies; increasing the value of C3 increases the
performance of PSRR.
10
THD+N
(%)
1
10−1
002aac083
(1)
(2)
10−2
10
102 103
Po = 0.5 W; Gv = 20 dB.
(1) VCC = 6 V; RL = 8 Ω.
(2) VCC = 7.5 V; RL = 16 Ω.
104 105
f (Hz)
Fig 8. Total harmonic distortion-plus-noise as a
function of frequency
−20
PSRR
(dB)
−40
−60
αcs
(dB)
−70
−80
−90
002aac084
(1)
(2)
(3)
−100
10
102 103 104 105
f (Hz)
VCC = 6 V; VO = 2 V; RL = 8 Ω.
(1) Gv = 30 dB.
(2) Gv = 20 dB.
(3) Gv = 6 dB.
Fig 9. Channel separation as a function of frequency
002aac085
(1)
(2)
−60 (3)
−80
10
102 103 104 105
f (Hz)
VCC = 6 V; RS = 0 Ω; Vripple = 100 mV.
(1) Gv = 30 dB.
(2) Gv = 20 dB.
(3) Gv = 6 dB.
Fig 10. Power supply rejection ratio as a function of frequency
SA58637_1
Product data sheet
Rev. 01 — 25 February 2008
© NXP B.V. 2008. All rights reserved.
11 of 22
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| PDF Descargar | [ Datasheet SA58637.PDF ] | |
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