Eval Board

IS31AP2110 20W Stereo Class-D Audio Amplifier with Power Limit
And Dynamic Temperature Control
DESCRIPTION
RECOMMENDED EQUIPMENT
The IS31AP2110 is a high efficiency stereo class-D
audio amplifier with adjustable power limit function and
dynamic temperature control. The evaluation board
operates from a single 8~26V supply voltage and can
deliver 20W/CH into an 8 loudspeaker without the
need for an external heat sink.



It supports parallel BTL mode to deliver 40W into a
4 loudspeaker with 0.11% THD+N. The adjustable
power limit function allows the user to set a voltage rail
lower than half of 3.3V to limit the amount of current
through the speaker.
8~26V, 3A power supply
Audio source with 3.5mm mini plug
Pair of speakers (4Ω or 8Ω) with RCA-type plugs
ABSOLUTE MAXIMUM RATINGS


≤ 26V power supply
≥ 4Ω and ≤ 8Ω speaker
Caution: Do not exceed the conditions listed above; otherwise
the board will be damaged.
PROCEDURE
FEATURES




Single supply voltage
- 8V ~ 26V board operation
- Built-in 3.3V LDO
87% efficient Class-D operation eliminates need
for heat sink
Board Selectable settings
 Four user selectable gain settings
 PBTL or BTL mode
 Auto recovery mode
 Adjustable power limit function for speaker
protection (requires potentiometer VR1)
IS31AP2110 IC features
 Short-Circuit protection with auto recovery
option
 Under-voltage detection
 Over-voltage protection
 Pop noise and click noise reduction
 Over temperature protection with auto
recovery
 Dynamic temperature control prevents chip
from over heating
QUICK START
Figure 1: Photo of IS31AP2110Evaluation Board
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 07/20/2014
The IS31AP2110 demo board is fully assembled and
tested. Follow the steps listed below to verify board
operation.
Caution: Do not turn on the power supply until all connections
are completed.
1)
2)
3)
4)
5)
6)
With JP3 = L, connect a pair of 4Ω (or 8Ω)
speakers to the SPKR RCA Jack (ROUT
connector) and SPKL RCA Jack (LOUT
connector).
Connect the power supply ground to the GND
terminal and positive to the VCC terminal or
connect a power jack to CON2.
If the audio is stereo, connect audio source to the
audio connector (3.5mm) and close jumpers JP4
and JP5, default is closed.
If the audio source is differential, connect the
audio source to LINP/LINN terminals (left channel)
and RINP/RINN terminals (right channel). JP4
and JP5 jumpers should be open.
Turn on the power supply.
Turn on the audio source.
PERFORMANCE DESCRIPTION
There are five configuration jumpers to enable the
following IC functions:
1) JP8 - Enable/disable the IC. Jumper is closed to H
is enable, closed to L to disable. When JP8 is
closed to H and JP6 is closed, the short-circuit
auto recovery function is enabled.
2) JP3–Enable/disable PBTL (MONO) Mode.
Jumper J3 closed to L is BTL Mode. Jumper J3
closed to H is PBTL Mode. If PBTL jumper is set to
H (PBTL mode), the Left outputs (OUTPL and
OUTNL) as well as the Right outputs (OUTPR and
OUTNR) are synchronized and in phase. This
allows the connection of OUTPL to OUTNL and
OUTPR to OUTNR.
3) JP1 and JP2 – Output Gain Selection. Four gain
levels can be selected based on the table below.
JP1=L
JP2=L
JP1=L
JP2=H
JP1=H
JP2=L
JP1=H
JP2=H
20dB
26dB
32dB
36dB
1
IS31AP2110 20W Stereo Class-D Audio Amplifier with Power Limit
And Dynamic Temperature Control
4) Power limit adjustment: add a potentiometer (100K)
VR1 from PLIMIT pin to ground to adjust the output
voltage limit. The voltage Vplimit sets a limit on the
output peak-to-peak voltage. The maximum BTL
output voltage of the gain control amplifier is limit
to 2*(1.55v-Vplimit), The Class-D BTL output
voltage on loudspeaker is amplified by 9.95 of
2*(1.55V-Vplimit),
- VIN is the input peak voltage.
- Gv is the gain of gain control amplifier, the four
gain levels are 1V/V, 2V/V, 4V/V, 6.34V/V,
corresponding to 20dB, 26dB, 32dB, 36dB overall
gain.
-Vplimit>1.55V or Vplimit=GND are all without
power limit feature.
For normal BTL operation (Stereo) and PBTL
(Mono) operation:


POUT  2  VP  9.95  2  RL 
2
for unclipped power
(1)
Where:
- VP is the peak voltage of gain control amplifier
output
if (VIN×Gv /2) < (1.55V–VPLIM), then VP =
(VIN×Gv /2).
5) Please refer to the IS31AP2110 datasheet for
additional device information.
if (VIN×Gv/2) > (1.55V–VPLIM), then VP =
(1.55V–VPLIM).
Jumper Setting Table
Jumper
JP1 (GAIN1),
JP2 (GAIN0)
Options
Select between four amplifier
gain levels
JP3 (PBTL)
Enable/Disable PBTL
JP4 (LINN)
JP5 (RINN)
JP6
JP8
Single ended audio input
Setting (note: Jumper on “H” for logic 1, on “L” for logic 0)
JP1 – JP2
0 - 0 : 20dB Gain
0 - 1 : 26dB Gain
1 - 0 : 32dB Gain
1 - 1 : 36dB Gain
0 - BTL mode
1 - PBTL mode (Parallel BTL)
Insert header to ground unused negative audio line input
Auto-Recovery enable
Audio amp shutdown
Insert header to enable auto-recovery of short circuit faults
H (1) – outputs enabled
L (0) – outputs Hi-Z
ORDERING INFORMATION
Part No.
Temperature Range
Package
IS31AP2110-ZLS2-EB
-40°C to +85°C (Industrial)
TSSOP-28, Lead-free
Table 1: Ordering Information
For pricing, delivery, and ordering information, please contacts ISSI’s analog marketing team at
[email protected] or (408) 969-6600.
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 07/20/2014
2
IS31AP2110 20W Stereo Class-D Audio Amplifier with Power Limit
And Dynamic Temperature Control
PVCC
H
PVCC
R7
R3
100K
100K
U1
3
SD
2
L
24V-JACK
1
1
JP8
C25
VCCL
VCCL
JP6
2
100uF/35V
CON2
SDB
BEAD
28
27
C12
AVDD
FAULTB
JP1
H
GND
L
JP2
100K
H
3
2
R2
GAIN1
1
NC
5
GAIN0
1
6
PLMIT
C2
GAIN1
OUTL+
1uF
3
C3
1uF
4
OUTL-
RINN
C4
C5
RINP
1uF
1uF
PVCC
R4
100K
H
INL-
11
12
RINPP1
14
INROUTR+
INR+
PBTL
NC
VCCR
VCCR
R8
24
C13
23
R12
0R
L7
NC
BEAD
NC
NC
R10 NC
C19
NC
NC
20
L4
19
NC
BEAD
C16
NC R9 NC
C20
NC
C17
18
L6
17,21,22,26
16
15
1
2
CON3
1
2
0R
L8
MONO
ROUT
L10 NC
R13
BEAD
SPK L
LOUT
0R
R15
NC
C23
NC
L9 NC
R14
R11 NC
C15
C21
NC
C18
NC
C24
NC
C22
NC
NC
SPK R
1
2
CON4
0R
BEAD
PVCC
C10
0.1uF
C9
1nF
3
2
L
L5
L3 BEAD
PGND
JP5
VR1
INL+
OUTR-
AUDIO IN
NC
C14
C1
JP4
LINN
R5
25
LINPP1
NC
CON1
10
GAIN0
PGND
LINP
100uF/35V
R6
10K
1uF
8
100K
3
2
L
AGND
L1
9
C6
R1
C7
0.1uF
1nF
FAULTB
PVCC
PVCC
C11
C8
L2
100uF/35V
IS31AP2110
1
JP3
Figure 2: IS31AP2110 Application Schematic
BILL OF MATERIALS
Name
Symbol
Audio Amplifier
U1
Resistors
Description
Qty
Supplier
Part No.
Class-D Audio Amplifier
1
ISSI
IS31AP2110
R1~R3,R7
RES,100K,1/16W,±5%,SMD
4
Yageo
RC0603JR-07100KL
Resistor
R6
RES,10K,1/16W,±5%,SMD
1
Yageo
RC0603JR-0710KL
Resistors
R12~R15
RES,0R,1/10W,±5%,SMD
4
Yageo
RL0805JR-0700KL
Capacitors
C10,C11,
CAP,0.1µF,16V,±20%,SMD
2
Yageo
CX0603MRX7R7BB104
Capacitors
C12,C9
CAP, 1nF,16V,±20%,SMD
2
Yageo
CX0603MKX7R7BB102
Capacitors
C1,C3~C6
CAP, 1µF,16V,±20%,SMD
5
Yageo
CX0603MKX7R7BB105
Capacitors
C7,C8,C25
CAP,100µF,35V,±20%,SMD
3
Bead
L1~L6
BEAD,80ohm/100MHZ,SMD
6
Yageo
UPB321611T-800Y–S
Connector
CON2
2.5mm DC connector
1
Connector
CON1
3.5mm min plug
1
connector
CON3,CON4
RCA –type plugs
2
Headers
J1,J2,J3,J8
3 pin headers
4
Headers
J4,J5,J6
2 pin headers
4
Headers
LOUT,ROUT,
MONO
2 pin headers
3
Table 2: Bill of Materials, refers to Figure 2 above.
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 07/20/2014
3
IS31AP2110 20W Stereo Class-D Audio Amplifier with Power Limit
And Dynamic Temperature Control
Figure 3: Board Component Placement Guide -Top Layer
Figure 4: Board PCB Layout- Top Layer
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 07/20/2014
4
IS31AP2110 20W Stereo Class-D Audio Amplifier with Power Limit
And Dynamic Temperature Control
Figure 5: Board Component Placement Guide -Bottom Layer
Figure 6: Board PCB Layout-Bottom Layer
Copyright © 2014 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its
products at any time without notice. ISSI assumes no liability arising out of the application or use of any information, products or services
described herein. Customers are advised to obtain the latest version of this device specification before relying on any published information
and before placing orders for products.
Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction
of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness.
Products are not authorized for use in such applications unless Integrated Silicon Solution, Inc. receives written assurance to its satisfaction,
that:
a.) the risk of injury or damage has been minimized;
b.) the user assume all such risks; and
c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 07/20/2014
5