TS4871 ST Microelectronics, Inc., TS4871 Datasheet

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TS4871

Manufacturer Part Number
TS4871
Description
1W Mono Audio Amplifier With Standby Active High
Manufacturer
ST Microelectronics, Inc.
Datasheet

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DESCRIPTION
The TS4871 is an Audio Power Amplifier capable
of delivering 1W of continuous RMS Ouput Power
into 8 load @ 5V.
This Audio Amplifier is exhibiting 0.1% distortion
level (THD) from a 5V supply for a Pout = 250mW
RMS. An external standby mode control reduces
the supply current to less than 10nA. 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.
APPLICATIONS
ORDER CODE
MiniSO & DFN only available in Tape & Reel with T suffix(IST & IQT)
D = Small Outline Package (SO) - also available in Tape & Reel (DT)
June 2003
TS4871
Number
OPERATING FROM V
1W RAIL TO RAIL OUTPUT POWER @
Vcc=5V, THD=1%, f=1kHz, with 8 Load
ULTRA LOW CONSUMPTION IN STANDBY
MODE (10nA)
75dB PSRR @ 217Hz from 5V to 2.6V
ULTRA LOW POP & CLICK
ULTRA LOW DISTORTION (0.1%)
UNITY GAIN STABLE
AVAILABLE IN SO8, MiniSO8 & DFN8 3x3mm
Mobile Phones (Cellular / Cordless)
Laptop / Notebook Computers
PDAs
Portable Audio Devices
Part
OUTPUT RAIL TO RAIL 1W AUDIO POWER AMPLIFIER
Temperature
-40, +85°C
Range: I
CC
D
Package
= 2.5V to 5.5V
S
Q
Marking
4871I
4871
PIN CONNECTIONS (Top View)
TYPICAL APPLICATION SCHEMATIC
WITH STANDBY MODE
STANDBY
STANDBY
TS4871ID-TS4871IDT - SO8
BYPASS
BYPASS
TS4871IST - MiniSO8
V
V
V
V
IN+
IN+
IN-
IN-
TS4871IQT - DFN8
1
1
3
3
4
4
2
2
8
8
7
7
6
6
5
5
V
V
GND
GND
Vcc
Vcc
V
V
TS4871
OUT 2
OUT 2
OUT 1
OUT 1
1/28

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TS4871 Summary of contents

Page 1

... ULTRA LOW DISTORTION (0.1%) UNITY GAIN STABLE AVAILABLE IN SO8, MiniSO8 & DFN8 3x3mm DESCRIPTION The TS4871 is an Audio Power Amplifier capable of delivering 1W of continuous RMS Ouput Power into 8 load @ 5V. This Audio Amplifier is exhibiting 0.1% distortion level (THD) from a 5V supply for a Pout = 250mW RMS ...

Page 2

... TS4871 ABSOLUTE MAXIMUM RATINGS Symbol 1) V Supply voltage Input Voltage i T Operating Free Air Temperature Range oper T Storage Temperature stg T Maximum Junction Temperature j Thermal Resistance Junction to Ambient R thja SO8 MiniSO8 QNF8 Pd Power Dissipation ESD Human Body Model ESD Machine Model ...

Page 3

... 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 = 217Hz 3. All electrical values are made by correlation between 2.6V and 5V measurements Parameter 2) RFeed = 22K Vripple = 200mV rms 3) Parameter 2) RFeed = 22K Vripple = 200mV rms TS4871 Min. Typ. Max. Unit 1000 nA 5 ...

Page 4

... TS4871 ELECTRICAL CHARACTERISTICS V = 2.6V, GND = 0V 25°C (unless otherwise specified) CC amb Symbol Supply Current input signal, no load 1) Standby Current I STANDBY No input signal, Vstdby = Vcc Output Offset Voltage Voo No input signal Output Power Po THD = 1% Max 1kHz Total Harmonic Distortion + Noise THD + 200mW rms 20Hz < ...

Page 5

... Frequency (kHz) 80 Vcc = 2.6V Gain 560pF Tamb = Phase 20 0 -20 -40 0 100 1000 10000 Frequency (kHz) TS4871 0 -20 -40 -60 -80 -100 -120 -140 -160 -180 -200 -220 10000 0 -20 -40 -60 -80 -100 -120 -140 -160 -180 -200 -220 ...

Page 6

... TS4871 Fig Open Loop Frequency Response 100 80 Phase 60 Gain Vcc = 560pF -20 Tamb = 25 C -40 0 100 1000 Frequency (kHz) Fig Open Loop Frequency Response 100 80 Phase 60 Gain Vcc = 2.6V - 560pF Tamb = 25 C -40 0 100 1000 Frequency (kHz) 6/28 Fig Open Loop Frequency Response ...

Page 7

... & 0.1 F Rfeed = 22k Cfeed=150pF Vripple = 200mVrms Input = floating Cfeed=330pF Tamb = 25 C Cfeed=680pF 10 100 1000 10000 Frequency (Hz) Cin=1 F Vcc = 5, 3.3 & 2.6V Cin=330nF Rfeed = 22k , Rin = 22k Cin=220nF Rg = 100 , Tamb = 25 C Cin=100nF Cin=22nF 10 100 1000 10000 Frequency (Hz) TS4871 100000 100000 7/28 ...

Page 8

... TS4871 Fig Pout @ THD + Supply Voltage & 1kHz 4 1.0 BW < 125kHz Tamb = 25 C 0.8 0.6 0.4 0.2 0.0 2.5 3.0 3.5 4.0 Vcc (V) Fig Power Dissipation vs Pout 1.4 Vcc=5V F=1kHz 1.2 THD+N<1% 1.0 0.8 0.6 0.4 0.2 RL=16 0.0 0.0 0.2 0.4 0.6 0.8 Output Power (W) Fig Power Dissipation vs Pout 0.40 Vcc=2.6V 0.35 F=1kHz THD+N<1% 0.30 0.25 0.20 0.15 RL=8 0.10 0.05 RL=16 0.00 0.0 0.1 0.2 Output Power (W) 8/28 Fig Pout @ THD + N = 10% vs Supply Voltage ...

Page 9

... Cin = < 125kHz, Tamb = 25 C 20kHz 1 20Hz 1E-3 0.01 0.1 Output Power ( Vcc = 3. Cin = < 125kHz Tamb = 25 C 20kHz 20Hz 1kHz 0.01 0.1 Output Power ( Vcc = 2. Cin = < 125kHz Tamb = 20kHz 20Hz 1kHz 0.01 0.1 Output Power (W) TS4871 1kHz 1 1 9/28 ...

Page 10

... TS4871 Fig THD + N vs Output Power Vcc = Cin = < 125kHz Tamb = 20Hz, 1kHz 20kHz 0.1 1E-3 0.01 0.1 Output Power (W) Fig THD + N vs Output Power Vcc = 3. Cin = < 125kHz Tamb = 20kHz 20Hz, 1kHz 0.1 1E-3 0.01 Output Power (W) Fig THD + N vs Output Power Vcc = 2 ...

Page 11

... BW < 125kHz, Tamb = 25 C 20Hz 1 20kHz 1kHz 0.1 1E-3 0.01 0.1 Output Power ( Vcc = 3.3V 0.1 F, Cin = < 125kHz, Tamb = 20kHz 20Hz 1kHz 1E-3 0.01 0.1 Output Power ( Vcc = 2.6V 0.1 F, Cin = < 125kHz, Tamb = 20kHz 20Hz 1kHz 0.1 1E-3 0.01 0.1 Output Power (W) TS4871 1 1 11/28 ...

Page 12

... TS4871 Fig THD + N vs Output Power Vcc = Cin = < 125kHz 1 Tamb = 25 C 20kHz 0.1 20Hz, 1kHz 0.01 1E-3 0.01 Output Power (W) Fig THD + N vs Output Power Vcc = 3. Cin = < 125kHz 1 Tamb = 25 C 20kHz 0.1 20Hz, 1kHz 0.01 1E-3 0.01 Output Power (W) Fig THD + N vs Output Power ...

Page 13

... Tamb = 25°C 20 100 1000 Frequency (Hz Vcc = 3. 1µF BW < 125kHz 1 Tamb = 25°C Pout = 540mW Pout = 270mW 20 100 1000 Frequency (Hz Vcc = 2. 1µ < 125kHz Tamb = 25°C Pout = 240 & 120mW 20 100 1000 Frequency (Hz) TS4871 10000 10000 10000 13/28 ...

Page 14

... TS4871 Fig THD + N vs Frequency 0.1µ 1µF 0.1 20 100 1000 Frequency (Hz) Fig THD + N vs Frequency 0.1µ 1µF 0.1 20 100 1000 Frequency (Hz) Fig THD + N vs Frequency 0.1µ 1µF 0.1 20 100 1000 Frequency (Hz) 14/28 Fig THD + N vs Frequency Vcc = Pout = 900mW BW < ...

Page 15

... Tamb = 25° 0.1µ 1µF 20 100 1000 Frequency (Hz Vcc = 2. Pout = 110mW BW < 125kHz Tamb = 25° 0.1µ 1µF 20 100 1000 Frequency (Hz Vcc = 2. Pout = 110mW BW < 125kHz Cb = 0.1µF Tamb = 25° 1µF 20 100 1000 Frequency (Hz) TS4871 10000 10000 10000 15/28 ...

Page 16

... TS4871 Fig THD + N vs Frequency 1 Pout = 310mW 0.1 Pout = 620mW 0.01 20 100 1000 Frequency (Hz) Fig THD + N vs Frequency 1 Pout = 270mW 0.1 Pout = 135mW 0.01 20 100 1000 Frequency (Hz) Fig THD + N vs Frequency 1 Pout = 80mW 0.1 Pout = 160mW 0.01 20 100 1000 Frequency (Hz) 16/28 Fig THD + N vs Frequency Vcc = 1µF BW < ...

Page 17

... Fig Current Consumption vs Standby Voltage @ Vcc = 5V RL Cin = 1µF THD+N < 0.7% Tamb = 25°C 4.5 5 RL=16 RL Cin = 1µF THD+N < 0.7% Tamb = 25°C 60 2.5 3.0 3.5 4.0 Vcc (V) 7 Vstandby = 0V Tamb = 25° Vcc (V) 7 Vcc = 5V Tamb = 25° 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 Vstandby (V) TS4871 RL=8 4.5 5 4.0 4.5 5.0 17/28 ...

Page 18

... TS4871 Fig Current Consumption vs Standby Voltage @ Vcc = 2. 0.0 0.5 1.0 1.5 Vstandby (V) Fig Clipping Voltage vs Power Supply Voltage and Load Resistor 1.0 0.9 Tamb = 25 C 0.8 0.7 0.6 0 0.4 0.3 0.2 0.1 0.0 2.5 3.0 3.5 Power supply Voltage (V) Fig Vout1+Vout2 Unweighted Noise Floor 120 Vcc = 2.5V to 5V, Tamb = Cin = 1 F 100 Input Grounded ...

Page 19

... APPLICATION INFORMATION Fig Demoboard Schematic Fig SO8 & MiniSO8 Demoboard Components Side TS4871 19/28 ...

Page 20

... Fig SO8 & MiniSO8 Demoboard Bottom Solder Layer BTL Configuration Principle The TS4871 is a monolithic power amplifier with a BTL output type. BTL (Bridge Tied Load) means that each end of the load is connected to two single ended output amplifiers. Thus, we have : Single ended output 1 = Vout1 = Vout (V) ...

Page 21

... The maximum theoretical value is reached when Vpeak = Vcc, so Decoupling of the circuit Two capacitors are needed to bypass properly the TS4871, a power supply bypass capacitor Cs and a bias voltage bypass capacitor Cb. Cs has especially an influence on the THD+N in high frequency (above 7kHz) and indirectly on the power supply disturbances. With 100µ ...

Page 22

... TS4871 the internal generator resistance 50k . Then, the charge time constant for 50k xCb ( directly connected to the non-inverting input (pin 2 & 3) and if we want to minimize, in amplitude and duration, the output spike on Vout1 (pin 5), Cin must be charged faster than Cb. The ...

Page 23

... RinF C L which gives 16Hz. In Higher frequency we want 20kHz (-3dB cut off frequency). The Gain Bandwidth Product of the TS4871 is 2MHz typical and doesn’t change when the amplifier delivers power into the load. The first amplifier has a gain of: Rfee d ----------------- = and the theoretical value of the -3dB cut-off higher frequency is 2MHz/3 = 660kHz ...

Page 24

... Part Type 110k / 0.125W 22k / 0.125W 22k / 0.125W 110k / 0.125W 330k / 0.125W (Vcc-Vf_led)/If_led 470nF 470nF 100µF 100nF Short Circuit Short Circuit 1µF Led 3mm 2mm insulated Plug 10.16mm pitch 3 pts connector 2.54mm pitch PCB Phono Jack TS4871ID or TS4871IS ...

Page 25

... High/low cut-off frequencies For their calculation, please check this "Frequency Response Gain vs Cin, & Cfeed" graph: 10000 100000 -10 -15 -20 -25 10 TS4871 -------------------------------------------- - 10 Rms Cfeed = 330pF Cfeed = 680pF Cfeed = 2.2nF Cin = 470nF Cin = 22nF Cin = 82nF ...

Page 26

... TS4871 PACKAGE MECHANICAL DATA DIM. MIN. A 1.35 A1 0.10 A2 1.10 B 0.33 C 0.19 D 4. 5.80 h 0.25 L 0.40 k ddd 26/28 SO-8 MECHANICAL DATA mm. TYP MAX. 1.75 0.25 1.65 0.51 0.25 5.00 4.00 1.27 6.20 0.50 1.27 ˚ (max.) 8 0.1 inch MIN. TYP. MAX. 0.053 0.069 0.04 0.010 0.043 0.065 0.013 0.020 0.007 0.010 0.189 0.197 0.150 0.157 0.050 0.228 0.244 0.010 0.020 ...

Page 27

... PACKAGE MECHANICAL DATA TS4871 27/28 ...

Page 28

... TS4871 PACKAGE MECHANICAL DATA Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice ...

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