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SA58631TK
3 W BTL audio amplifier
General descriptionThe SA58631isa one channel audio amplifierinan HVSON8 package.It provides power
output of 3 W with an 8 Ω load at 9 V supply. The internal circuit is comprised of a BTL
(Bridge Tied Load) amplifier with a complementary PNP-NPN output stage and
standby/mute logic. The SA58631 is housed in an 8-pin HVSON package which has an
exposed die attach paddle enabling reduced thermal resistance and increased power
dissipation.
Features Low junction-to-ambient thermal resistance using exposed die attach paddle Gain can be fixed with external resistors from 6 dB to 30 dB Standby mode controlled by CMOS-compatible levels Low standby current <10 μA No switch-on/switch-off plops High power supply ripple rejection: 50 dB minimum ElectroStatic Discharge (ESD) protection Output short circuit to ground protection Thermal shutdown protection
Applications Professional and amateur mobile radio Portable consumer products: toys and games Personal computer remote speakers
SA58631
3 W BTL audio amplifier
Rev. 02 — 12 October 2007 Product data sheet
NXP Semiconductors SA58631
3 W BTL audio amplifier Quick reference data[1] With a load connected at the outputs the quiescent current will increase, the maximum of this increase
being equal to the DC output offset voltage divided by RL.
[2] Supply voltage ripple rejectionis measuredatthe output witha source impedanceofRs=0Ωatthe input.
The ripple voltage is a sine wave with a frequency of 1 kHz and an amplitude of 100 mV (RMS), which is
applied to the positive supply rail.
[3] Supply voltage ripple rejectionis measuredatthe output, witha source impedanceofRs=0Ωatthe input.
The ripple voltage is a sine wave with a frequency between 100 Hz and 20 kHz and an amplitude of
100 mV (RMS), which is applied to the positive supply rail.
Ordering information
Table 1. Quick reference dataVCC =5V; Tamb =25 °C;RL =8Ω;f=1 kHz; VMODE=0V; measuredin test circuit Figure3; unless
otherwise specified.
VCC supply voltage operating 2.2 9 18 V quiescent current RL= ∞Ω [1]- 8 12 mA
Istb standby current VMODE =VCC --10 μA output power THD+N=10% 1 1.2 - W
THD+N= 0.5% 0.6 0.9 - W
THD+N=10%;
VCC =9V 3.0 - W
THD+N total harmonic distortion-plus-noise Po= 0.5W - 0.15 0.3 %
PSRR power supply rejection ratio [2] 50 --dB
[3] 40 --dB
Table 2. Ordering informationSA58631TK HVSON8 plastic thermal enhanced very thin small outline package; leads; 8 terminals; body 4 x 4 x 0.85 mm
SOT909-1
NXP Semiconductors SA58631
3 W BTL audio amplifier Block diagram Pinning information
7.1 Pinning
NXP Semiconductors SA58631
3 W BTL audio amplifier
7.2 Pin description Functional descriptionThe SA58631 is a single-channel BTL audio amplifier capable of delivering 3 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 dB to 30 dB by external feedback resistors.
8.1 Power amplifierThe 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, on the negative side the saturation voltage of an NPN
power transistor. The total voltage loss is <1 V. With a supply voltage of 9 V and an 8Ω
loudspeaker, an output power of 3 W can be delivered to the load.
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.
Table 3. Pin descriptionMODE 1 operating mode select (standby, mute, operating)
SVR 2 half supply voltage, decoupling ripple rejection
IN+ 3 positive input
IN− 4 negative input
OUT− 5 negative output terminal
VCC 6 supply voltage
GND 7 ground
OUT+ 8 positive output terminal
NXP Semiconductors SA58631
3 W BTL audio amplifier Limiting values[1] AC and DC short-circuit safe voltage.
10. Thermal characteristics[1] Thermal resistance is 28 K/W with DAP soldered to 32 cm2 (5 in2), 35 μm copper (1 ounce copper) heat
spreader.
Table 4. Limiting valuesIn accordance with the Absolute Maximum Rating System (IEC 60134).
VCC supply voltage operating −0.3 +18 V input voltage −0.3 VCC+ 0.3 V
IORM repetitive peak output current - 1 A
Tstg storage temperature non-operating −55 +150 °C
Tamb ambient temperature operating −40 +85 °C
VP(sc) short-circuit supply voltage [1] -10 V
Ptot total power dissipation HVSON8 - 2.3 W
Table 5. Thermal characteristicsRth(j-a) thermal resistance from junction to
ambient
free air 80 K/W
9.7 cm2 (1.5in2)
heat spreader
[1] 32 K/W
32 cm2 (5in2)
heat spreader
[1] 28 K/W
Rth(j-sp) thermal resistance from junction to
solder point K/W
NXP Semiconductors SA58631
3 W BTL audio amplifier
11. Static characteristics[1] With a load connected at the outputs the quiescent current will increase, the maximum of this increase being equal to the DC output
offset voltage divided by RL.
[2] The DC output voltage with respect to ground is approximately 0.5× VCC.
12. Dynamic characteristics[1] Gain of the amplifier is 2× (R2/ R1) in test circuit of Figure3.
[2] The noise output voltage is measured at the output in a frequency range from 20 Hz to 20 kHz (unweighted), with a source impedance
of RS=0 Ω at the input.
[3] Supply voltage ripple rejection is measured at the output with a source impedance of Rs=0 Ω at the input. The ripple voltage is a
sine wave with a frequency of 1 kHz and an amplitude of 100 mV (RMS), which is applied to the positive supply rail.
[4] Supply voltage ripple rejection is measured at the output, with a source impedance of Rs=0 Ω at the input. The ripple voltage is a
sine wave witha frequency between 100Hz and20 kHz andan amplitudeof 100mV (RMS), whichis appliedtothe positive supply rail.
[5] Output voltage in mute position is measured with an input voltage of 1 V (RMS) in a bandwidth of 20 kHz, which includes noise.
Table 6. Static characteristicsVCC =5V; Tamb =25 °C; RL =8 Ω; VMODE=0 V; measured in test circuit Figure 3; unless otherwise specified.
VCC supply voltage operating 2.2 9 18 V quiescent current RL= ∞Ω [1]- 8 12 mA
Istb standby current VMODE =VCC --10 μA output voltage [2]- 2.2 - V
ΔVO(offset) differential output voltage offset - - 50 mV
IIB(IN+) input bias current on pin IN+ - - 500 nA
IIB(IN−) input bias current on pin IN− - - 500 nA
VMODE voltage on pin MODE operating 0 - 0.5 V
mute 1.5 - VCC− 1.5 V
standby VCC− 0.5 - VCC V
IMODE current on pin MODE 0V< VMODE
Table 7. Dynamic characteristics
VCC =5V; Tamb =25 °C; RL =8 Ω; f=1 kHz; VMODE=0 V; measured in test circuit Figure 3; unless otherwise specified. output power THD+N=10% 1 1.2 - W
THD+N= 0.5% 0.6 0.9 - W
THD+N=10 %; VCC =9V - 3.0 - W
THD+N total harmonic
distortion-plus-noise= 0.5W - 0.15 0.3 %
Gv(cl) closed-loop voltage gain [1]6 - 30 dB
ΔZi differential input
impedance 100 - kΩ
Vn(o) noise output voltage [2]- - 100 μV
PSRR power supply rejection
ratio
[3] 50 --dB
[4] 40 --dB output voltage mute condition [5]- - 200 μV
NXP Semiconductors SA58631
3 W BTL audio amplifier
13. Application information
14. Test information
14.1 Test conditions
The junction to ambient thermal resistance, Rth(j-a)= 27.7 K/W for the HVSON8 package
when the exposed die attach paddleis solderedto32 cm2(5in2) areaof35 μm(1 ounce)
copper heat spreader on the demo PCB. The maximum sine wave power dissipation for
Tamb =25 °C is:
Thus, for Tamb= +85 °C the maximum total power dissipation is:
The power dissipation versus ambient temperature curve (Figure 5) shows the power
derating profiles with ambient temperature for three sizes of heat spreaders. For a more
modest heat spreader using 9.7 cm2 (1.5in2 ) area on the top side of the PCB, the
Rth(j-a)is 31.25 K/W. When the package is not soldered to a heat spreader, the Rth(j-a)
increases to 83.3 K/W.
150 25–
27.7--------------------- 4.5W=
150 85–
27.7--------------------- 2.35W=
NXP Semiconductors SA58631
3 W BTL audio amplifier
14.2 BTL application
Tamb =25 °C, VCC=9 V, f=1 kHz, RL =8 Ω, Gv=20 dB, audio band-pass 20 Hz to kHz. The BTL diagram is shown in Figure3.
The quiescent current has been measured without any load impedance. The total
harmonic distortion+ noise (THD+N) as a function of frequency was measured with a
low-pass filter of 80 kHz. The value of capacitor C2 influences the behavior of PSRR at
low frequencies; increasing the valueof C2 increases the performanceof PSRR. Figure6
shows three areas: operating, mute and standby. It shows that the DC switching levels of
the mute and standby respectively depends on the supply voltage level.
The following characterization curves show the room temperature performance for
SA58631 using the demo PCB shown in Figure 21. The 8 curves for power dissipation
versus output power (Figure 10 through Figure 17) as a function of supply voltage, heat
spreader area, load resistance and voltage gain show that there is very little difference in
performance with voltage gain; however, there are significant differences with supply
voltage and load resistance.
The curvesfor THD+N versus output power (Figure 18) show that the SA58631 yields the
best power output using an 8 Ω load at 9 V supply. Under these conditions the part
delivers typically 3 W output power for THD+N=10 %.
NXP Semiconductors SA58631
3 W BTL audio amplifier
NXP Semiconductors SA58631
3 W BTL audio amplifier
NXP Semiconductors SA58631
3 W BTL audio amplifier
