TS4871
Datasheet
Output rail-to-rail 1 W audio power amplifier with standby mode
Features
TS4871IST - MiniS O8
Standby
1
8
Bypass
2
7
GND
VIN+
3
6
VCC
VIN-
4
5
VOUT1
VOUT2
TS4871ID-TS4871IDT - SO8
Standby
1
8
VOUT2
Bypass
2
7
GND
VIN+
3
6
VCC
VIN-
4
5
VOUT1
•
Operating from VCC = 2.5 V to 5.5 V
•
1 W rail-to-rail output power @ VCC = 5 V, THD = 1%, f = 1 kHz, with 8 Ω load
•
•
•
•
•
•
Ultra low consumption in standby mode (10 nA)
75 dB PSRR @ 217 Hz from 5 V to 2.6 V
Ultra low pop and click
Ultra low distortion (0.1%)
Unity gain stable
Available in SO8 and MiniSO8
Applications
•
•
•
•
Mobile phones (cellular / cordless)
Laptop / notebook computers
PDAs
Portable audio devices
Description
The TS4871 is an audio power amplifier capable of delivering 1 W of continuous
RMS output power into 8 Ω load @ 5 V.
Product status link
TS4871
This audio amplifier exhibits 0.1% distortion level (THD) from a 5 V supply for a Pout
= 250 mW RMS. An external standby mode control reduces the supply current to less
than 10 nA. An internal thermal shutdown protection is also provided.
The TS4871 has been designed for high quality audio applications such as mobile
phones and to minimize the number of external components.
The unity-gain stable amplifier can be configured by external gain setting resistors.
DS2547 - Rev 9 - May 2019
For further information contact your local STMicroelectronics sales office.
www.st.com
TS4871
Pin configuration
1
Pin configuration
Figure 1. Pin connections (top view)
TS4871ID-TS4871IDT - SO8
Standby
DS2547 - Rev 9
1
8
VOUT2
Bypass
2
7
GND
VIN+
3
6
VCC
VIN-
4
5
VOUT1
TS4871IST - MiniSO8
Standby
1
8
VOUT2
Bypass
2
7
GND
VIN+
3
6
VCC
VIN-
4
5
VOUT1
page 2/46
TS4871
Maximum ratings
2
Maximum ratings
Table 1. Absolute maximum ratings
Symbol
Parameter
VCC
Supply voltage
(1)
Value
Unit
6
V
Vi
Input voltage (2)
GND to VCC
V
Toper
Operating free air temperature range
-40 to + 85
°C
Tstg
Storage temperature
-65 to +150
°C
Tj
Maximum junction temperature
150
°C
Thermal resistance junction-to-ambient (3)
SO8
Rthja
175
°C/W
Thermal resistance junction-to-ambient (3)
MiniSO8
215
Pd
Power dissipation
Internally limited (4)
ESD
Human body model
2
kV
ESD
Machine model
200
V
Latch-up
Latch-up immunity
Class A
Lead temperature (soldering, 10 s)
260
°C
1. All voltages values are measured with respect to the ground pin.
2. The magnitude of input signal must never exceed VCC + 0.3 V / GND - 0.3 V
3. The device is protected in case of overtemperature by a thermal shutdown active @ 150 °C.
4. Exceeding the power derating curves during a long period, involves abnormal operating conditions.
Table 2. Operating conditions
Symbol
Parameter
VCC
Supply voltage
VICM
Common mode Input voltage range
Value
Unit
2.5 to 5.5
V
GND to VCC - 1.2 V
V
GND ≤ VSTB≤ 0.5 V
V
Standby voltage input:
VSTB
device ON
Standby voltage input:
device OFF
RL
Load resistor
Thermal resistance junction-to-ambient (1)
Rthja
SO8
Thermal resistance junction-to-ambient (1)
MiniSO8
VCC - 0.5 V ≤ VSTB ≤
VCC
4 - 32
Ω
150
°C/W
190
1. This thermal resistance can be reduced with a suitable PCB layout (see power derating curves).
DS2547 - Rev 9
page 3/46
TS4871
Electrical characteristics
3
Electrical characteristics
Table 3. Electrical characteristics VCC = +5 V, GND = 0 V, Tamb = 25 °C (unless otherwise specified).
Symbol
ICC
ISTANDBY (1)
VOO
PO
THD + N
PSRR (2)
ϕM
GM
GBP
Parameter
Supply current
No input signal, no load
Standby current
No input signal, VSTDBY = VCC, RL = 8 Ω
Output offset voltage
No input signal, RL = 8 Ω
Output power
THD = 1% max., f = 1 kHz, RL = 8 Ω
Total harmonic distortion + noise
PO = 250 mWrms, Gv = 2, 20 Hz < f < 20 kHz, RL = 8 Ω
Power supply rejection ratio
f = 217 Hz, RL = 8 Ω, RFeed = 22 K Vripple = 200 mVrms
Phase margin at unity gain
RL = 8 Ω, CL = 500 pF
Gain margin
RL = 8 Ω, CL = 500 pF
Gain bandwidth product
RL = 8 Ω
Min.
Typ.
Max.
Unit
6
8
mA
10
1000
nA
5
20
mV
1
W
0.15
%
75
dB
70
Degrees
20
dB
2
MHz
1. Standby mode is actived when Vstdby is tied to VCC.
2. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the surimposed sinus signal to VCC @ f = 217 Hz.
DS2547 - Rev 9
page 4/46
TS4871
Electrical characteristics
Table 4. Electrical characteristics VCC = +3.3 V, GND = 0 V, Tamb = 25 °C (unless otherwise specified)
Symbol
ICC
ISTANDBY (1)
VOO
PO
THD + N
PSRR (2)
ϕM
GM
GBP
Parameter
Min.
Supply current
No input signal, no load
Standby current
No input signal, VSTDBY = VCC, RL = 8 Ω
Output offset voltage
No input signal, RL = 8 Ω
Output power
THD = 1% max., f = 1 kHz, RL = 8 Ω
Total harmonic distortion + noise
PO = 250 mWrms, Gv = 2, 20 Hz < f < 20 kHz, RL = 8
Power supply rejection ratio
f = 217 Hz, RL = 8 Ω, RFeed = 22 kΩ Vripple = 200 mVrms
Phase margin at unity gain
RL = 8 Ω, CL = 500 pF
Gain margin
RL = 8 Ω, CL = 500 pF
Gain bandwidth product
RL = 8 Ω
Typ.
Max.
Unit
5.5
8
mA
10
1000
nA
5
20
mV
450
mW
0.15
%
75
dB
70
Degrees
20
dB
2
MHz
1. Standby mode is actived when Vstdby is tied to VCC
2. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the surimposed sinus signal to VCC @ f = 217 Hz
Note:
All electrical values are made by correlation between 2.6 V and 5 V measurements.
Table 5. Electrical characteristics VCC = +2.6 V, GND = 0 V, Tamb = 25 °C (unless otherwise specified).
Symbol
ICC
ISTANDBY (1)
VOO
PO
Parameter
Supply current
No input signal, no load
Standby current
No input signal, VSTDBY = VCC, RL = 8 Ω
Output offset voltage
No input signal, RL = 8 Ω
Output power
THD = 1% max.., f = 1 kHz, RL = 8 Ω
Min.
Typ.
Max.
Unit
5.5
8
mA
10
1000
nA
5
20
mV
260
mW
0.15
%
75
dB
Total harmonic distortion + noise
THD + N
PO = 250 mWrms, Gv = 2, 20 Hz < f < 20 kHz, RL
=8Ω
Power supply rejection ratio
PSRR (2)
DS2547 - Rev 9
f = 217 Hz, RL = 8 Ω, RFeed = 22 kΩ, Vripple = 200
mVrms
page 5/46
TS4871
Electrical characteristics
Symbol
Parameter
Min.
Phase margin at unity gain
ϕM
RL = 8 Ω, CL = 500 pF
Gain margin
GM
RL = 8 Ω, CL = 500 pF
Typ.
Unit
70
Degrees
20
dB
2
MHz
Gain bandwidth product
GBP
Max.
RL = 8 Ω
1. Standby mode is actived when Vstdby is tied to VCC
2. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the surimposed sinus signal to VCC @ f = 217 Hz
Table 6. Bill of material
Components
Functional description
Rin
Inverting input resistor which sets the closed loop gain in conjunction with Rfeed. This
resistor also forms a high pass filter with Cin [fc = 1 / (2 x Pi x Rin x Cin)]
Cin
Input coupling capacitor which blocks the DC voltage at the amplifier input terminal
Rfeed
Feed back resistor which sets the closed loop gain in conjunction with Rin
Cs
Supply bypass capacitor which provides power supply filtering
Cb
Bypass pin capacitor which provides half supply filtering
Cfeed
Rstb
Gv
Low pass filter capacitor allowing to cut the high frequency
[low pass filter cut-off frequency 1 / (2 x Pi x Rfeed x Cfeed)]
Pull-up resistor which fixes the right supply level on the standby pin
Closed loop gain in BTL configuration = 2 x (Rfeed / Rin)
Remarks
1.
All measurements, except PSRR measurements, are made with a supply bypass capacitor Cs = 100 μF.
2.
3.
DS2547 - Rev 9
External resistors are not needed for having better stability when supply @ VCC down to 3 V. By the way, the
quiescent current remains the same.
The standby response time is about 1 μs.
page 6/46
TS4871
Electrical characteristics curves
Electrical characteristics curves
Figure 2. Open loop frequency response Vcc=5 V
Figure 3. Open loop frequency response ZL=8 Ω
0
-60
-80
Phase
-100
20
-120
-140
0
40
Vcc = 5V
ZL = 8Ω + 560pF
Tamb = 25°C
-140
-160
-180
1
10
100
1000
10000
-180
-20
-200
-220
-40
0.3
1
10
Frequency (kHz)
Figure 4. Open loop frequency response Vcc=3.3 V
Gain
60
Vcc = 3.3V
RL = 8Ω
Tamb = 25°C
-40
-60
-120
-140
-160
0
-180
-200
-20
-220
-40
0.3
DS2547 - Rev 9
1
10
100
1000
Frequency (kHz)
10000
-240
Gain (dB)
-100
20
-220
0
Gain
60
Phase (Deg)
Gain (dB)
Phase
10000
80
-20
-80
40
100
1000
Frequency (kHz)
Figure 5. Open loop frequency response Vcc=3.3 V,
ZL=8 Ω
0
80
-60
-120
0
-200
-40
0.3
-40
-100
20
-160
-20
-20
-80
Phase
Gain (dB)
Gain (dB)
40
Gain
-40
Phase (Deg)
Vcc = 5V
RL = 8Ω
Tamb = 25°C
Gain
60
-20
Phase (Deg)
0
60
Vcc = 3.3V
ZL = 8Ω + 560pF
Tamb = 25°C
-20
-40
-60
-80
40
Phase
-100
-120
20
-140
-160
0
Phase (Deg)
4
-180
-200
-20
-220
-40
0.3
1
10
100
1000
Frequency (kHz)
10000
-240
page 7/46
TS4871
Electrical characteristics curves
Figure 6. Open loop frequency response Vcc=2.6 V Figure 7. Open loop frequency response Vcc=2.6 V,
ZL=8 Ω
Gain
60
-60
-100
-120
20
-140
-160
0
1
10
100
1000
Frequency (kHz)
10000
80
-100
Phase
-160
20
-20
-40
0.3
-180
Vcc = 5V
CL = 560pF
Tamb = 25°C
1
10
20
-180
0
-40
0.3
DS2547 - Rev 9
10
-180
-200
Vcc = 3.3V
CL = 560pF
Tamb = 25°C
1
10
-220
100
1000
Frequency (kHz)
10000
-240
-50
-60
Vripple = 200mVrms
Rfeed = 22Ω
Input = floating
RL = 8Ω
Tamb = 25°C
Vcc = 5V, 3.3V & 2.6V
Cb = 1µF & 0.1µF
-200
Vcc = 2.6V
CL = 560pF
Tamb = 25°C
1
Phase (Deg)
Gain (dB)
-140
-160
-20
-40
-120
Gain
-140
-30
-100
40
-120
Figure 11. Power supply rejection ratio (PSRR) vs
power supply
-80
60
-100
Phase
-160
-40
0.3
10000
Phase
-240
-80
20
-20
Figure 10. Open loop frequency response
Vcc=2.6 V, CL=560 pF
80
10000
40
0
-220
100
100
1000
Frequency (kHz)
Gain
-200
100
1000
Frequency (kHz)
10
60
PSRR (dB)
0
1
80
Gain (dB)
-140
40
-200
100
Phase (Deg)
Gain (dB)
Gain
-160
Figure 9. Open loop frequency response Vcc=3.3 V,
CL=560 pF
-120
60
-140
-40
0.3
Figure 8. Open loop frequency response Vcc=5 V,
CL=560 pF
-80
-120
-220
-240
100
-60
-100
20
-20
-220
-40
0.3
-40
-180
-200
-20
Phase
0
-180
-20
-80
40
Gain (dB)
Phase
Vcc = 2.6V
ZL = 8Ω + 560pF
Tamb = 25°C
Gain
60
Phase (Deg)
Gain (dB)
-40
-80
40
0
80
-20
Phase (Deg)
Vcc = 2.6V
RL = 8Ω
Tamb = 25°C
Phase (Deg)
0
80
-220
100
1000
Frequency (kHz)
10000
-240
-70
-80
10
100
1000
10000
Frequency (Hz)
100000
page 8/46
TS4871
Electrical characteristics curves
Figure 12. Power supply rejection ratio (PSRR) vs
feedback capacitor
Figure 13. Power supply rejection ratio (PSRR) vs
bypass capacitor
-10
PSRR (dB)
-30
-40
Cb=1µF
Cfeed=0
-20
Cfeed=150pF
Cfeed=330pF
-50
-70
100
1000
10000
Frequency (Hz)
Cb=100µF
-80
10
100000
100
1000
10000
100000
Frequency (Hz)
Figure 15. Power supply rejection ratio (PSRR) vs
feedback resistor
Vcc = 5, 3.3 & 2.6V
Rfeed = 22kΩ, Rin = 22k
Cb = 1µF
Rg = 100Ω, RL = 8Ω
Tamb = 25°C
-40
-20
-30
PSRR (dB)
PSRR (dB)
Cin=220nF
-30
-40
Vcc = 5, 3.3 & 2.6V
Cb = 1µF & 0.1µF
Vripple = 200mVrms
Input = floating
RL = 8Ω
Tamb = 25°C
Rfeed=110kΩ
Rfeed=47kΩ
-50
-60
Cin=100nF
-50
Cb=47µF
-50
-10
Cin=1µF
Cin=330nF
-20
-40
-70
Cfeed=680pF
Figure 14. Power supply rejection ratio (PSRR) vs
input capacitor
-10
Vcc = 5, 3.3 & 2.6V
Rfeed = 22k
Rin = 22k, Cin = 1µF
Rg = 100Ω, RL = 8Ω
Tamb = 25°C
-60
-60
-80
10
Cb=10µF
-30
PSRR (dB)
-20
-10
Vcc = 5, 3.3 & 2.6V
Cb = 1µF & 0.1µF
Rfeed = 22kΩ
Vripple = 200mVrms
Input = floating
RL = 8Ω
Tamb = 25°C
Rfeed=22kΩ
Cin=22nF
-70
Rfeed=10kΩ
-60
10
100
1000
Frequency (Hz)
DS2547 - Rev 9
10000
100000
-80
10
100
1000
10000
Frequency (Hz)
100000
page 9/46
TS4871
Electrical characteristics curves
Figure 16. Pout @ THD + N = 1% vs supply voltage Figure 17. Pout @ THD + N = 10% vs supply voltage
vs RL
vs RL
1.2
1.0
2.0
8Ω
Gv = 2 & 10
Cb = 1µF
F = 1kHz
BW < 125kHz
Tamb = 25°C
Output power @ 10% THD + N (W)
Output power @ 1% THD + N (W)
1.4
6Ω
4Ω
0.8
16Ω
0.6
0.4
0.2
32Ω
0.0
2.5
3.0
3.5
4.0
4.5
1.8
1.6
1.4
8Ω
6Ω
4Ω
1.2
1.0
16Ω
0.8
0.6
0.4
0.2
0.0
2.5
5.0
Gv = 2 & 10
Cb = 1µF
F = 1kHz
BW < 125kHz
Tamb = 25°C
32Ω
3.0
3.5
Vcc (V)
Figure 18. Power dissipation vs Pout Vcc=5 V
RL=4Ω
Power Dissipation (W)
Power Dissipation (W)
Vcc=3.3V
F=1kHz
0.5 THD+N 4.4 ms).
Increasing Cin value increases the pop and click phenomena to an unpleasant sound at power supply ON and
standby function ON/OFF.
Why Cs is not important in pop and click consideration ?
Hypothesis :
Cs = 100 μF
Supply voltage = 5 V
Supply voltage internal resistor = 0.1 Ω
Supply current of the amplifier Icc = 6 mA
At power ON of the supply, the supply capacitor is charged through the internal power supply resistor. So, to
reach 5 V you need about five to ten times the charging time constant of Cs (τs = 0.1 x Cs (s)).
Then, this time equal 50 μs to 100 μs > τdischCs.
5.7
Power amplifier design examples
Given :
Load impedance : 8 Ω
Output power @ 1% THD+N : 0.5 W
Input impedance : 10 kΩ min.
Input voltage peak to peak : 1 Vpp
Bandwidth frequency : 20 Hz to 20 kHz (0, -3 dB)
Ambient temperature max = 50 °C
SO8 package
First of all, we must calculate the minimum power supply voltage to obtain 0.5 W into 8 Ω. With curves in fig. 15,
we can read 3.5 V. Thus, the power supply voltage value min. is 3.5 V.
Following the maximum power dissipation equation
Pdissmax =
2VCC2
= W
π2RL
with 3.5 V we have Pdissmax = 0.31 W
Refer to power derating curves (fig. 20), with 0.31 W the maximum ambient temperature is 100 °C. This last value
could be higher if you follow the example layout shown on the demoboard (better dissipation).
The gain of the amplifier in flat region is:
VOUTPP
2 2RLPOUT
GV =
=
= 5.65
VINPP
VINPP
We have Rin > 10 kΩ. Let's take Rin = 10 kΩ, then Rfeed = 28.25 kΩ. We could use for Rfeed = 30 kΩ in
normalized value and the gain is Gv = 6.
In lower frequency we want 20 Hz (- 3dB cut-off frequency). Then:
So, we could use for Cin a 1 μF capacitor value
1
CIN =
= 795 nF
2πRinFCL
which gives 16 Hz.
In higher frequency we want 20 kHz (- 3dB cut off frequency). The gain bandwidth product of the TS4871 is 2
MHz typical and does not change when the amplifier delivers power into the load.
The first amplifier has a gain of:
Rfeed
= 3
Rin
and the theoretical value of the - 3 dB cut-off higher frequency is 2 MHz/3 = 660 kHz.
We can keep this value or limit the bandwidth by adding a capacitor Cfeed, in parallel on Rfeed.
Then:
1
CFEED =
= 265pF
2πRFEEDFCH
So, we could use for Cfeed a 220 pF capacitor value that gives 24 kHz.
Now, we can calculate the value of Cb with the formula τb = 50 kΩ x Cb >> τin = (Rin+Rfeed) x Cin which permits
to reduce the pop and click effects.
Then Cb >> 0.8 μF.
We can choose for Cb a normalized value of 2.2 μF that gives good results in THD+N and PSRR.
In the following tables, you could find three another examples with values required for the demoboard.
DS2547 - Rev 9
page 30/46
TS4871
Application n°1 : 20 Hz to 20 kHz bandwidth and 6 dB gain BTL power amplifier
Remark : components with (*) marking are optional.
5.8
Application n°1 : 20 Hz to 20 kHz bandwidth and 6 dB gain BTL power amplifier
Table 7. Components
DS2547 - Rev 9
Designator
Part type
R1
22 k / 0.125 W
R4
22 k / 0.125 W
R6
Short-circuit
R7
330 k / 0.125 W
R8*
(Vcc-Vf_led) / If_led
C5
470 nF
C6
100 µF
C7
100 nF
C9
Short-circuit
C10
Short-circuit
C12
1 µF
S1, S2, S6, S7
2 mm insulated plug 10.16 mm pitch
S8
3 pt connector 2.54 mm pitch
P1
PCB phono Jack
D1*
Led 3 mm
U1
TS4871ID or TS4871IS
page 31/46
TS4871
Application n°2 : 20 Hz to 20 kHz bandwidth and 20 dB gain BTL power amplifier
5.9
Application n°2 : 20 Hz to 20 kHz bandwidth and 20 dB gain BTL power
amplifier
Table 8. Components
DS2547 - Rev 9
Designator
Part type
R1
110 k / 0.125 W
R4
22 k / 0.125 W
R6
Short-circuit
R7
330 k / 0.125 W
R8*
(Vcc-Vf_led) / If_led
C5
470 nF
C6
100 µF
C7
100 nF
C9
Short-circuit
C10
Short-circuit
C12
1 µF
S1, S2, S6, S7
2 mm insulated plug 10.16 mm pitch
S8
3 pt connector 2.54 mm pitch
P1
PCB phono Jack
D1*
Led 3 mm
U1
TS4871ID or TS4871IS
page 32/46
TS4871
Application n° 3: 50 Hz to 10 kHz bandwidth and 10 dB gain BTL power amplifier
5.10
Application n° 3: 50 Hz to 10 kHz bandwidth and 10 dB gain BTL power
amplifier
Table 9. Components
DS2547 - Rev 9
Designator
Part type
R1
33 k / 0.125 W
R2
Short-circuit
R4
22 k / 0.125 W
R6
Short-circuit
R7
330 k / 0.125 W
R8*
(Vcc-Vf_led) / If_led
C2
470 pF
C5
150 nF
C6
100 µF
C7
100 nF
C9
Short-circuit
C10
Short-circuit
C12
1 µF
S1, S2, S6, S7
2 mm insulated plug 10.16 mm pitch
S8
3 pts connector 2.54 mm pitch
P1
PCB phono Jack
D1*
Led 3 mm
U1
TS4871ID or TS4871IS
page 33/46
TS4871
Application n°4 : Differential inputs BTL power amplifier
5.11
Application n°4 : Differential inputs BTL power amplifier
In this configuration, we need to place these components : R1, R4, R5, R6, R7, C4, C5, C12.
We have also : R4 = R5, R1 = R6, C4 = C5.
The gain of the amplifier is:
R1
GVDIFF = 2
R4
For Vcc = 5 V, a 20 Hz to 20 kHz bandwidth and 20 dB gain BTL power amplifier you could follow the bill of
material below.
Table 10. Components
5.12
Designator
Part type
R1
110 k / 0.125 W
R4
22 k / 0.125 W
R5
22 k / 0.125 W
R6
110 k / 0.125 W
R7
330 k / 0.125 W
R8*
(Vcc-Vf_led) / If_led
C4
470 nF
C5
470 nF
C6
100 µF
C7
100 nF
C9
Short-circuit
C10
Short-circuit
C12
1 µF
D1*
Led 3 mm
S1, S2, S6, S7
2 mm insulated plug 10.16 mm pitch
S8
3 pts connector 2.54 mm pitch
P1, P2
PCB phono Jack
U1
TS4871ID or TS4871IS
Note on how to use the PSRR curves
We have finished a design and we have chosen the components values
•
Rin=Rfeed=22 kΩ
•
Cin=100 nF
•
Cb=1 μF
Now, on fig. 13, we can see the PSRR (input grounded) vs. frequency curves. At 217 Hz we have a PSRR value
of -36 dB.
In reality we want a value about -70 dB. So, we need a gain of 34 dB.
Now, on fig. 12 we can see the effect of Cb on the PSRR (input grounded) vs. frequency. With Cb=100 μF, we can
reach the -70 dB value.
The process to obtain the final curve (Cb=100 μF, Cin=100 nF, Rin=Rfeed=22 kΩ) is a simple transfer point by
point on each frequency of the curve on fig. 13 to the curve on fig. 12. The measurement result is shown on the
next figure.
DS2547 - Rev 9
page 34/46
TS4871
Principle of operation
Figure 86. PSRR changes with Cb
Vcc = 5, 3.3 & 2.6V
Rfeed = 22k, Rin = 22k
Rg = 100Ω, RL = 8Ω
Tamb = 25°C
-30
Cin=100nF
Cb=1µF
PSRR (dB)
-40
-50
Cin=100nF
Cb=100µF
-60
-70
10
100
1000
10000
100000
Frequency (Hz)
What is the PSRR?
The PSRR is the power supply rejection ratio. It is a kind of SVR in a determined frequency range.
The PSRR of a device, is the ratio between a power supply disturbance and the result on the output. We can say
that the PSRR is the ability of a device to minimize the impact of power supply disturbances to the output.
How do we measure the PSRR?
Figure 87. PSRR measurement schematic
Rfeed
6
Vcc
Vripple
Vcc
4
Rin
3
VinVin+
-
Vout1 5
+
Cin
RL
2
Bypass
1
Standby
Av=-1
+
Cb
Vout2
8
Vs+
Bias
GND
Rg
100 Ohms
5.13
Vs-
TS4871
7
Principle of operation
We fixed the DC voltage supply (Vcc), the AC sinusoidal ripple voltage (Vripple) and no supply capacitor Cs is
used.
The PSRR value for each frequency is:
Rms Vripple
PSRR(dB) = 20xLog10
Rms(Vs+ − Vs−
DS2547 - Rev 9
page 35/46
TS4871
High/low cut-off frequencies
Remark : The measure of the Rms voltage is not a Rms selective measure but a full range (2 Hz to 125 kHz) Rms
measure.
It means that we measure the effective Rms signal + the noise.
5.14
High/low cut-off frequencies
For their calculation, please check the figure below:
Figure 88. Frequency response gain vs Cin and Cfeed
10
5
Gain (dB)
0
Cfeed = 680pF
-5
-10
-15
-20
-25
10
DS2547 - Rev 9
Cfeed = 330pF
Cin = 470nF
Cfeed = 2.2nF
Cin = 22nF
Cin = 82nF
Rin = Rfeed = 22kΩ
Tamb = 25°C
100
1000
Frequency (Hz)
10000
page 36/46
TS4871
Package information
6
Package information
In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK packages,
depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product
status are available at: www.st.com. ECOPACK is an ST trademark.
DS2547 - Rev 9
page 37/46
TS4871
MiniSO8 package information
6.1
MiniSO8 package information
Figure 89. MiniSO8 package outline
Table 11. MiniSO8 mechanical data
Dim.
Millimeters
Min.
Inches
Typ.
A
Min.
Typ.
1.1
A1
0
A2
0.75
b
Max.
0.043
0.15
0
0.95
0.03
0.22
0.4
0.009
0.016
c
0.08
0.23
0.003
0.009
D
2.8
3
3.2
0.11
0.118
0.126
E
4.65
4.9
5.15
0.183
0.193
0.203
E1
2.8
3
3.1
0.11
0.118
0.122
e
L
0.85
0.65
0.4
0.6
0.006
0.033
0.8
0.016
0.024
0.95
0.037
L2
0.25
0.01
ccc
0°
0.037
0.026
L1
k
DS2547 - Rev 9
Max.
8°
0.1
0°
0.031
8°
0.004
page 38/46
TS4871
SO8 package information
6.2
SO8 package information
Figure 90. SO-8 package outline
Table 12. SO-8 package mechanical data
Dimensions
Millimeters
Ref.
Min.
Typ.
A
0.10
A2
1.25
b
0.28
c
0.17
D
4.80
E
E1
Typ.
0.25
Max.
0.069
0.04
0.010
0.049
0.011
0.23
0.007
4.90
5.00
0.189
0.193
0.197
5.80
6.00
6.20
0.228
0.236
0.244
3.80
3.90
4.00
0.150
0.154
0.157
0.40
1.27
h
0.25
L
0.40
L1
DS2547 - Rev 9
Min.
0.48
e
ccc
Max.
1.75
A1
k
Inches
0.635
0.019
0.010
0.050
0.50
0.010
0.020
1.27
0.016
0.050
1.04
1°
0.016
0.040
8°
0.10
1°
8°
0.004
page 39/46
TS4871
Ordering information
7
Ordering information
Table 13. Ordering information
Order code
Temperature range
TS4871IST
TS4871IDT
TS4871ID
DS2547 - Rev 9
Package
MiniSO8
-40, +85°C
SO8
SO8
Packing
Tape and reel
Tube
Marking
4871l
4871
4871
page 40/46
TS4871
Revision history
Table 14. Document revision history
DS2547 - Rev 9
Date
Revision
08-May-2019
9
Changes
No history because of migration. Removed the part number
TS4871IQT and all its reference throughout the document.
page 41/46
TS4871
Contents
Contents
1
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
2
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
3
Electrical characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4
Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
6
7
5.1
BTL configuration principle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.2
Gain In typical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.3
Low and high frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.4
Power dissipation and efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.5
Decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.6
Pop and Click performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.7
Power amplifier design examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.8
Application n°1 : 20 Hz to 20 kHz bandwidth and 6 dB gain BTL power amplifier . . . . . . . . 31
5.9
Application n°2 : 20 Hz to 20 kHz bandwidth and 20 dB gain BTL power amplifier . . . . . . . 32
5.10
Application n° 3: 50 Hz to 10 kHz bandwidth and 10 dB gain BTL power amplifier . . . . . . . 33
5.11
Application n°4 : Differential inputs BTL power amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.12
Note on how to use the PSRR curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.13
Principle of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5.14
High/low cut-off frequencies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Package information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
6.1
MiniSO8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
6.2
SO8 package information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
DS2547 - Rev 9
page 42/46
TS4871
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Table 11.
Table 12.
Table 13.
Table 14.
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical characteristics VCC = +5 V, GND = 0 V, Tamb = 25 °C (unless otherwise specified).. .
Electrical characteristics VCC = +3.3 V, GND = 0 V, Tamb = 25 °C (unless otherwise specified)
Electrical characteristics VCC = +2.6 V, GND = 0 V, Tamb = 25 °C (unless otherwise specified).
Bill of material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MiniSO8 mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SO-8 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ordering information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DS2547 - Rev 9
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. 3
. 3
. 4
. 5
. 5
. 6
31
32
33
34
38
39
40
41
page 43/46
TS4871
List of figures
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
Figure 23.
Figure 24.
Figure 25.
Figure 26.
Figure 27.
Figure 28.
Figure 29.
Figure 30.
Figure 31.
Figure 32.
Figure 33.
Figure 34.
Figure 35.
Figure 36.
Figure 37.
Figure 38.
Figure 39.
Figure 40.
Figure 41.
Figure 42.
Figure 43.
Figure 44.
Figure 45.
Figure 46.
Figure 47.
Figure 48.
Figure 49.
Figure 50.
Figure 51.
Figure 52.
DS2547 - Rev 9
Pin connections (top view) . . . . . . . . . . . . . . . . . . . . . . .
Open loop frequency response Vcc=5 V . . . . . . . . . . . . .
Open loop frequency response ZL=8 Ω . . . . . . . . . . . . . .
Open loop frequency response Vcc=3.3 V . . . . . . . . . . . .
Open loop frequency response Vcc=3.3 V, ZL=8 Ω . . . . . .
Open loop frequency response Vcc=2.6 V . . . . . . . . . . . .
Open loop frequency response Vcc=2.6 V, ZL=8 Ω . . . . . .
Open loop frequency response Vcc=5 V, CL=560 pF . . . . .
Open loop frequency response Vcc=3.3 V, CL=560 pF . . .
Open loop frequency response Vcc=2.6 V, CL=560 pF . . .
Power supply rejection ratio (PSRR) vs power supply . . . .
Power supply rejection ratio (PSRR) vs feedback capacitor
Power supply rejection ratio (PSRR) vs bypass capacitor . .
Power supply rejection ratio (PSRR) vs input capacitor . . .
Power supply rejection ratio (PSRR) vs feedback resistor. .
Pout @ THD + N = 1% vs supply voltage vs RL . . . . . . . .
Pout @ THD + N = 10% vs supply voltage vs RL . . . . . . .
Power dissipation vs Pout Vcc=5 V . . . . . . . . . . . . . . . . .
Power dissipation vs Pout Vcc=3.3 V. . . . . . . . . . . . . . . .
Power dissipation vs Pout Vcc=2.6 V. . . . . . . . . . . . . . . .
Power derating curves . . . . . . . . . . . . . . . . . . . . . . . . . .
THD + N vs output power Gv=2, Vcc= 5 V . . . . . . . . . . . .
THD + N vs output power Gv=10, Vcc =5 V . . . . . . . . . . .
THD + N vs output power Gv=2, Vcc = 3.3 V . . . . . . . . . .
THD + N vs output power Gv=10, Vcc = 3.3 V . . . . . . . . .
THD + N vs output power Gv=2, Vcc = 2.6 V . . . . . . . . . .
THD + N vs output power Gv=10, Vcc = 2.6 V . . . . . . . . .
THD + N vs output power Gv=2, Vcc= 5 V, RL=8 Ω . . . . .
THD + N vs output power Gv=10, Vcc = 5 V . . . . . . . . . . .
THD + N vs output power RL= 8 Ω . . . . . . . . . . . . . . . . .
THD + N vs output power RL= 8 Ω, Vcc=3.3 V . . . . . . . . .
THD + N vs output power RL= 8 Ω, Vcc=2.6 V . . . . . . . . .
THD + N vs output power RL= 8 Ω, Gv=10 . . . . . . . . . . . .
THD + N vs output power Gv=2, Vcc=5 V, Cb=0.1 µF . . . .
THD + N vs output power Gv=10, Vcc = 5 V, Cb=0.1 µF. . .
THD + N vs output power Gv=2, Vcc = 3.3 V, Cb=0.1 µF . .
THD + N vs output power Gv=10, Vcc=3.3 V, Cb=0.1 µF . .
THD + N vs output power Gv=2, Vcc = 2.6 V, Cb=0.1 µF . .
THD + N vs output power Gv=10, Vcc=2.6 V, Cb=0.1 µF . .
THD + N vs output power RL=16 Ω Vcc=0 5 V . . . . . . . . .
THD + N vs output power RL=16 Ω Gv=10 . . . . . . . . . . . .
THD + N vs output power RL=16 Ω, Gv=2 . . . . . . . . . . . .
THD + N vs output power RL=16 Ω, Gv=10, VCC=3.3 V . . .
THD + N vs output power RL=16 Ω Vcc=2.6 V . . . . . . . . .
THD + N vs output power RL=16 Ω, Vcc=2.6 V , Gv=10. . .
THD + N vs frequency . . . . . . . . . . . . . . . . . . . . . . . . . .
THD + N vs frequency, Vcc=5 V . . . . . . . . . . . . . . . . . . .
THD + N vs frequency, Vcc=3.3 V . . . . . . . . . . . . . . . . . .
THD + N vs frequency, Gv=10 . . . . . . . . . . . . . . . . . . . .
THD + N vs frequency, Vcc=2.6 V . . . . . . . . . . . . . . . . . .
THD + N vs frequency, Vcc=2.6 V, RL = 4 Ω . . . . . . . . . . .
THD + N vs frequency, Vcc=5 V, RL=8 Ω . . . . . . . . . . . . .
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page 44/46
TS4871
List of figures
Figure 53.
Figure 54.
Figure 55.
Figure 56.
Figure 57.
Figure 58.
Figure 59.
Figure 60.
Figure 61.
Figure 62.
Figure 63.
Figure 64.
Figure 65.
Figure 66.
Figure 67.
Figure 68.
Figure 69.
Figure 70.
Figure 71.
Figure 72.
Figure 73.
Figure 74.
Figure 75.
Figure 76.
Figure 77.
Figure 78.
Figure 79.
Figure 80.
Figure 81.
Figure 82.
Figure 83.
Figure 84.
Figure 85.
Figure 86.
Figure 87.
Figure 88.
Figure 89.
Figure 90.
DS2547 - Rev 9
THD + N vs frequency, Pout=450 mW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
THD + N vs frequency, Pout=900 mW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
THD + N vs frequency, Pout=450 mW, RL=8 Ω . . . . . . . . . . . . . . . . . . . . . . . . . .
THD + N vs frequency, Pout=400 mW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
THD + N vs frequency, Pout=200 mW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
THD + N vs frequency, Pout=400 mW, Gv=010. . . . . . . . . . . . . . . . . . . . . . . . . . .
THD + N vs frequency, Pout=200 mW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
THD + N vs frequency, Pout=220 mW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
THD + N vs frequency, Pout=110 mW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
THD + N vs frequency, Pout=220 mW, Vcc= 2.6 V . . . . . . . . . . . . . . . . . . . . . . . .
THD + N vs frequency, Pout=110 mW, Vcc= 2.6 V. . . . . . . . . . . . . . . . . . . . . . . . .
THD + N vs frequency, RL=16 Ω . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
THD + N vs frequency, RL=16 Ω , Gv=10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
THD + N vs frequency, RL=16 Ω , Gv=2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
THD + N vs frequency, RL=16 Ω , Gv=10, Vcc=3.3 V. . . . . . . . . . . . . . . . . . . . . . .
THD + N vs frequency, RL=16 Ω , Gv=2, Vcc=2.6 V . . . . . . . . . . . . . . . . . . . . . . .
THD + N vs frequency, RL=16 Ω , Gv=10, Pout= 160 mW . . . . . . . . . . . . . . . . . . .
Signal-to-noise ratio vs power supply with unweighted filter (20 Hz to 20 kHz). . . . . .
Signal-to-noise ratio vs power supply with weighted filter type A . . . . . . . . . . . . . . .
Signal-to-noise ratio vs power supply with weighted filter type A Gv=2 . . . . . . . . . . .
Current consumption vs power supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signal-to-noise ratio vs power supply with unweighted filter (20 Hz to 20 kHz) Gv=10
Current consumption vs standby voltage @ Vcc = 5 V . . . . . . . . . . . . . . . . . . . . . .
Current consumption vs standby voltage @ Vcc = 2.6 V. . . . . . . . . . . . . . . . . . . . .
Current consumption vs standby voltage @ Vcc = 3.3 V. . . . . . . . . . . . . . . . . . . . .
Clipping voltage vs power supply voltage and load resistor. . . . . . . . . . . . . . . . . . .
Clipping voltage low-side vs power supply voltage and load resistor . . . . . . . . . . . .
Vout1+Vout2 unweighted noise floor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vout1+Vout2 A-weighted noise floor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Demoboard schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SO8 & MiniSO8 demoboard components side . . . . . . . . . . . . . . . . . . . . . . . . . . .
SO8 and MiniSO8 demoboard top solder layer . . . . . . . . . . . . . . . . . . . . . . . . . . .
SO8 and MiniSO8 demoboard bottom solder layer . . . . . . . . . . . . . . . . . . . . . . . .
PSRR changes with Cb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PSRR measurement schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Frequency response gain vs Cin and Cfeed . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MiniSO8 package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SO-8 package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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TS4871
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DS2547 - Rev 9
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