AN1766
Application note
TS4990 low voltage audio power amplifier
Evaluation board user guidelines
TS4990 features
■
■
■
■
■
■
■
■
■
TS4990 low voltage audio power amplifier with active low standby mode
Operating from V
CC
=2.2V to 5.5V
1.2W output power @ V
CC
=5V, THD=1%, F=1kHz, with 8Ω load
Ultra low power consumption in standby mode (10nA)
62dB PSRR @ 217Hz in grounded mode (Av=2V/V)
Near zero pop & click
Ultra low distortion (0.1%)
Module gain set at 2V/V
Thermal and short circuit protection
Description
The DEMO TS4990 is an evaluation board designed for the TS4990 low power audio
amplifier. The micropackage DFN8 (dual flat non leaded 8 pins) allows space saving and
good thermal dissipation.
The BTL gain is set at 2V/V and can be adapted if necessary with a modification of R1 or R2
values.
On the board, R3 and C3 component locations are empty to allow you to modify the input
configuration from single ended to differential. For differential mode, R4 must be modified.
The C1 component location is also empty so that you can add a low pass filter if required.
More information about component calculations is available in the TS4990 datasheet.
November 2006
Rev 3
1/5
www.st.com
Connector configuration
AN1766
Connector configuration
Caution:
When you apply power supply through Cn1, DO NOT invert the polarity because it would
destroy the amplifier U1.
Connector
Cn1
Cn2 and Cn3
Cn4
Cn5
Description
Power connector (V
CC
and GND). Power supply voltage from 2.2V to 5.5V.
Input signal connector (GND and active input signal).
Output signal connector (V
out1
and V
out2
).
Standby control connector (V
CC
, standby, GND). A short-circuit between V
CC
and standby puts U1 in operation mode. A short-circuit between GND and
Standby puts U1 in standby mode.
Figure 1.
Schematic diagram
2/5
AN1766
Component list for the DEMO TS4990/DFN
Component list for the DEMO TS4990/DFN
Designation
C1
C2
C3
C4
C5
C6
Cn1
Cn2
Cn3
Cn4
Cn5
J1
R1
R2
R3
R4
U1
Quantity
0
1
0
1
1
1
1
1
1
1
1
1
1
1
0
1
1
Description
Unconnected, ceramic capacitors, 0603
100nF/16V, ceramic capacitors, 0603
Unconnected, ceramic capacitors, 0603
1μF/50V, electrolytic capacitor
100nF/16V, ceramic capacitors, 0603
1μF/50V, electrolytic capacitor
2 pins header 2.54mm pitch
2 pins header 2.54mm pitch
2 pins header 2.54mm pitch
2 pins header 2.54mm pitch
3 pins header 2.54mm pitch
Jumper, 2.54mm pitch
22k, 1/16W 1% resistor, 0603
22k, 1/16W 1% resistor, 0603
Unconnected, 1/16W 1% resistor, 0603
0R, 1/16W 1% resistor, 0603
TS4990IQ (DFN8 package)
3/5
Evaluation board layout
AN1766
Evaluation board layout
The following schematics show the different layers and the top view of the evaluation board.
Figure 2.
PCB top layer view
Figure 3.
PCB bottom layer view
Figure 4.
Top view of demo board
4/5
AN1766
Please Read Carefully:
Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the
right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any
time, without notice.
All ST products are sold pursuant to ST’s terms and conditions of sale.
Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no
liability whatsoever relating to the choice, selection or use of the ST products and services described herein.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this
document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products
or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such
third party products or services or any intellectual property contained therein.
UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED
WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS
OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT.
UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT
RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING
APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY,
DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE
GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER’S OWN RISK.
Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void
any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any
liability of ST.
ST and the ST logo are trademarks or registered trademarks of ST in various countries.
Information in this document supersedes and replaces all information previously supplied.
The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners.
© 2006 STMicroelectronics - All rights reserved
STMicroelectronics group of companies
Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan -
Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America
www.st.com
5/5
单片机
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
