Texas Instruments | TPA3138 Transition – from TPA3110, TPA3113 | Application notes | Texas Instruments TPA3138 Transition – from TPA3110, TPA3113 Application notes

Texas Instruments TPA3138 Transition – from TPA3110, TPA3113 Application notes
____________________________________________________
TPA3138 Transition Guide – from TPA3110, TPA3113
Victor Ceron, Audio Amplifier Products
Summary
TPA3110
Are you thinking about using TPA3110 or TPA3113?
Are you interested in reducing your 10W audio system
cost without changing your PCB?
If you answered YES to any of these questions, this
technical note will help you design a better, more costeffective system. The purpose of this technical note is
to help transition customers from TPA3110 or
TPA3113 to TI’s next-generation pin-to-pin compatible
inductor-less TPA3138.
What is TPA3138?
TPA3113
RDSON
240 mΩ
400 mΩ
180 mΩ
Supply Voltage
8 V – 26 V
8 V – 26 V
3.5 V – 14.4 V
Temperature
Range
–40°C – 85°C
–40°C – 85°C
–40°C – 85°C
15-W Filter10-W Inductor
6-W Filter-Free
Free Stereo
Free Stereo
Stereo Class-D
Class-D Autio
(BTL) Class-D
Autio Power
Datasheet Title
Power
Autio Power
Amplifier With
Amplifier With
Amplifier With
T
Speakerguard
SpeakerguardT M
Ultra Low EMI,
(SLOS650)
M
(SLOS528)
(SLOS993)
• Inductor
less: No
inductor
required,
only
ferrite
bead.
Lower
cost
solution.
• Low EMI:
Passes
EMI
testing
with only
ferrite
bead.
TPA3138 is TI’s new low EMI true inductor-less ClassD Audio Amplifier. TPA3138 is a stereo analog input
10W Class-D amplifier that needs no inductor; instead,
it can use low-cost ferrite beads without enabling any
EMC issues.
Thanks to its pin-to-pin compatibility to TPA3110 and
TPA3113, TPA3138 enable systems designers to
easily create smaller, more cost-effective systems with
minimum design effort.
Special
Features
How Does TPA3138 Compare to TI’s Pin-to-Pin
Compatible Legacy Class-D Amplifiers?
For customers transitioning from TPA3110 or
TPA3113, TPA3138 offers a smaller solution size and
lower cost as the bulky inductor is substituted for a
low-cost and smaller ferrite bead.
TPA3138
(Cost
Optimized)
Package
HTSSOP-28
9.7 × 4.4
Pad-Down
HTSSOP-28
9.7 × 4.4
Pad-Down
HTSSOP-28
9.7 × 4.4
Pad-Down
How Can I Transition to TPA3138?
Table 1. Comparison table for pin-to-pin
compatible TPA3110, TPA3113, and TPA3138
TPA3110
TPA3113
TPA3138
(Cost
Optimized)
Number of
Channels
2
2
2
Output Power
@ 8-Ω, 12-V,
10% THD+N
~10 W
~10 W
~10 W
Output Power
@ 8-Ω, 24-V,
10% THD+N
~30 W
~10 W
Idle Current
15.5 mA @ 12
V
15.5 mA @ 12
V
SLAA839 – July 2018
Submit Documentation Feedback
TI’s new TPA3138 is fully pin-to-pin compatible to TI’s
legacy TPA3110 and TPA3113. Systems currently
using any of the aforementioned legacy devices can
transition to TPA3138 as long as the power needs are
met per the tables above with minimum design
changes to accommodate a smaller ferrite bead. In
Figure 1 below, we show in detail how the output LC
filter components are swapped for a ferrite-bead-andcapacitor filter. Note the different values of the
components shown. Although not an exclusive list, TI
recommends: Sunlord’s UPZ2012E331-2R5TF 330
Ohm ferrite bead.
15.5 mA @ 12
V
TPA3138 Transition Guide – from TPA3110, TPA3113 Victor Ceron, Audio Amplifier
Copyright © 2018, Texas Instruments Incorporated
Products
1
www.ti.com
Isn’t EMI an Issue when no Inductor is Used?
CAUTION
This schematic is shown as
a reference only. System
designers must verify their
design to ensure full
compatibility.
TPA3110 Schematic
BSPL 26
OUTPL 25
0.22 …F
10 …+
In the past, inductor-less technology had the downside
of increasing EMI system concerns making their
implementation impractical.
Today, TPA3138 leverages TI’s proprietary technology
to maintain ultralow EMI hence eliminating potential
EMI issues when using ferrite beads and following
proper design and layout guidelines. TI’s evaluation
module, TPA3138D2EVM, meets EN55002 EMI
standards without the use of inductors as shown in
Figure 2 below.
0.68 …F
PGND 24
OUTNL 23
0.68 …F
10 …+
22
BSNL
BSNR 21
0.22 …F
0.22 …F
10 …+
OUTNR 20
PGND 19
0.68 …F
OUTPR 18
BSPR 17
0.68 …F
10 …+
0.22 …F
Figure 2. TPA3138 Passes EN55022 EMI Standard
Using Only Ferrite Beads
TPA3138 Schematic
BSPL 26
OUTPL 25
0.22 …F
FB
330
@ 100 MHz
1000 pF/2200 pF
PGND 24
OUTNL 23
1000 pF/2200 pF
FB
22
BSNL
BSNR 21
0.22 …F
0.22 …F
330
FB
330
OUTNR 20
PGND 19
@ 100 MHz
1000 pF/2200 pF
OUTPR 18
BSPR 17
@ 100 MHz
Additional Resources
• Download the TPA3138D2 datasheet (SLOS993).
• Get started quickly with the TPA3138D2 evaluation
module (EVM).
• LC Filter Design application note.
• Visit TI’s Smart Speaker portal to learn how
TPA3138D2 fits in this application.
1000 pF/2200 pF
FB
330
@ 100 MHz
0.22 …F
Figure 1. Suggested Transition Schematic
2
TPA3138 Transition Guide – from TPA3110, TPA3113 Victor Ceron, Audio Amplifier
Products
Copyright © 2018, Texas Instruments Incorporated
SLAA839 – July 2018
Submit Documentation Feedback
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