LA4425A-E [ONSEMI]
5W Power Amplifier with Very Few External Parts for Car Radio and Car Stereo;![LA4425A-E](http://pdffile.icpdf.com/pdf2/p00337/img/icpdf/LA4425F-E_2074432_icpdf.jpg)
型号: | LA4425A-E |
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描述: | 5W Power Amplifier with Very Few External Parts for Car Radio and Car Stereo PC |
文件: | 总9页 (文件大小:103K) |
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Ordering number : EN3309D
LA4425A
Monolithic Linear IC
http://onsemi.com
5W Power Amplifier
with Very Few External Parts
for Car Radio and Car Stereo
Overview
The LA4425A is a 5W power amplifier with very few external parts. The smallest package in the industry
[SIP-5H(TO-126 type)]. Only two external parts (Only I/O coupling capacitors). Almost no evaluation, adjustment and
check of its functions as a power IC required and simplified control
Functions
• Wide operation supply range → 5 to 16V
• On-chip protection:
- Over-voltage protection
- Thermal protection
- Output D.C. short protection .
• On-chip pop noise reducing circuit
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
V
Maximum supply voltage
V
max
Rg = 0
18
50
CC
Surge maximum supply voltage
V
surge
Giant pulse 200ms
Rise time 1ms
V
CC
Maximum output current
Allowable power dissipation
Operating temperature
Storage temperature
I
peak
3.3
7.5
A
O
Pd max
Topr
With infinite heat sink
W
°C
°C
-30 to +80
-40 to +150
Tstg
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Semiconductor Components Industries, LLC, 2013
June, 2013
53007 MS PC/53096HA(II)/20293TS/9200TA,TS(KOTO)/3050TA,TS(AF) No.3309-1/9
LA4425A
Operating Conditions at Ta = 25°C,
Parameter
Symbol
Conditions
Ratings
Unit
V
Recommended supply voltage
Recommended load resistance
Operating voltage range
V
13.2
4
CC
R
Ω
L
V
op
5 to 16
2 to 8
V
CC
op
Operating load resistance range
R
Under conditions where maximum ratings are
not exceeded
Ω
L
Electrical Characteristics at Ta = 25°C, V
= 13.2V, R = 4Ω, f = 1 kHz, Rg = 600Ω,
L
CC
specified board/specified circuit, 30×30×1.5mm3 thick aluminum used
Ratings
Parameter
Quiescent current
Symbol
Conditions
Unit
min
typ
max
130
I
65
45
5
mA
dB
W
CCO
Voltage gain
Output power
V
V
= 0dBm
43
4
47
G
O
P
P
1
2
13.2 V / 4Ω, THD = 10%
14.4 V / 4Ω, THD = 10%
O
O
5
6
W
Total harmonic distortion
Output noise voltage
Ripple rejection ratio
THD
V
= 2V
0.1
40
40
1.0
%
O
V
Rg = 0, BPF = 20 Hz to 20 kHz
Rg = 0, BPF = 20 Hz to 20 kHz
30
30
dB
dB
NO
SVRR1
V
= 0dBm, f = 100Hz
R
R
SVRR2
Rg = 0, BPF = 20 Hz to 20 kHz
= 0dBm, f = 100 Hz
47
dB
V
R
R
Over-voltage attack
Starting time
V
X
Rg = 0
21.5
0.35
50
V
s
CC
t
S
Input resistance
Roll-off frequency
R
f
kΩ
Hz
kHz
°C
IN
40
L
f
90
H
Thermal operating temperature
Tc
125
Package Dimensions
unit : mm (typ)
3031C
Pd max -- Ta
10
Al heat sink
.
mounting toque 39N cm
9.5
with sillicone grease applied.
2.7
3.2
8
7.5
Infinite heat sink
(2.0)
100×100×1.5mm3
50×50×1.5mm3
30×30×1.5mm3
6
5.7
4.3
4
2.9
1.1
1.5
2
No heat sink
1.2
0
-30 -20
0
20
40
60
80
100
Ambient temperature, Ta -- °C
1
5
(0.75)
2.0
0.5
1.2
0.6
SIP5H
No.A0195-2/9
LA4425A
Sample Application Circuit
V
13.2V
CC
+
• On-chip overvoltage protection
• On-chip thermal protection
• On-chip pop noise reducing circuit
• On-chip output D.C. short protection
5
1000μF
Ci 2.2μF
+
1
Co 1000μF
+
LA4425A
3
4
2
speaker
4Ω
Pin Voltage at V
= 13.2V
CC
Small signal
Large signal
Characteristics
Pin No.
Input
1
Output
V
CC
GND
2
GND
3
4
5
(≈ 2V
)
(≈ 1/2V
)
(V
)
Pin voltage
(reference value)
BE
CC
CC
0V
0V
1.4V
6.5V
13.2V
IC Usage Notes
Maximum ratings
If the IC is used in the vicinity of the maximum ratings, even a slight variation in conditions may cause the maximum
ratings to be exceeded, thereby leading to a breakdown.
Printed circuit board
When drawing the printed circuit pattern, refer to the sample printed circuit pattern. Be careful not to form a feedback
loop between input and output.
Comparison of External Components
External Parts
Output coupling capacitor
Input coupling capacitor
Bootstrap capacitor
Our ICs now in use
LA4425A
-
Feedback capacitor
-
Filter capacitor
-
Phase compensation capacitor
-
Oscillation correction polyester
film capacitor
-
Oscillation correction resistor
-
Total
8 pcs.
2 pcs.
Note: The power supply capacitor is not counted as a power IC part.
No.A0195-3/9
LA4425A
Sample Printed Circuit Pattern
LA4425A
GND
CV =1000μF
−
+
5
1
CC
V
CC
+
−
IN
−
+
OUT Co=1000μF
Ci=2.2μF GND
Cu-foiled side 78.0×29.0mm2
I
-- V
V
-- V
CC
CCO
CC
N
12
100
80
60
40
20
0
R =4Ω
R =4Ω
L
L
Rg=0
Rg=0
10
8
6
4
2
0
0
2
4
6
8
10 12 14 16 18 20 22 24
0
2
4
6
8
10 12 14 16 18 20 22 24
Supply voltage, V
CC
-- V
Supply voltage, V
-- V
CC
P
-- V
THD -- P
O
IN
O
10
10
V
=13.2V
7
V
=13.2V
CC
CC
7
5
R =4Ω
R =4Ω
5
L
L
f=1kHz
f=1kHz
3
2
Rg=600Ω
Rg=600Ω
3
2
1.0
7
5
1.0
7
5
3
2
3
2
0.1
7
5
0.1
3
7
5
2
5
7
2
3
5
7
2
3
5
7
2
3
5
7
2
3
5
7
1.0
0.1
1.0
10
10
100
Input voltage, V -- mV
IN
Output power, P -- W
O
f Response
THD -- f
1
0
3
2
V
=13.2V
CC
R =4Ω
L
Rg=600Ω
-1
V =2V(P =1W)
O
O
1.0
-2
-3
7
5
f
f
H
L
-4
3
2
-5
-6
-7
0.1
V
=13.2V
CC
-8
7
5
R =4Ω
L
Rg=600Ω
-9
V =0dBm
O
-10
10
3
2
3
5
2
3
5
2
3
5
2
3
5
3
5
7
2
3
5
7
2
3
5
7
2
3
100
1k
10k
100k
100
1k
10k
Frequency, f -- Hz
Frequency, f -- Hz
No.A0195-4/9
LA4425A
THD -- V
CC
P
-- V
O
CC
5
12
10
8
f=1kHz
R =4Ω
R =2Ω
L
L
Rg=600Ω
f=1kHz
3
2
THD=10%
V =2V(P =1W)
O
O
Rg=600Ω
R =4Ω
L
1.0
7
5
6
3
2
4
2
0.1
7
5
0
6
8
10
12
14
16
18
20
8
10
12
14
16
18
20
Supply voltage, V
CC
-- V
Supply voltage, V -- V
CC
I
, Pd -- P
I
, Pd -- P
CC
O
CC O
700
600
500
400
300
200
100
0
7
1200
1000
800
600
400
200
0
R =2Ω
R =4Ω
L
I
CC
L
f=1kHz
f=1kHz
I
6
5
4
3
2
1
0
Rg=600Ω
CC
Rg=600Ω
10
8
6
4
2
0
V
=16V
CC
V
=16V
CC
V
=13.2V
CC
V
=13.2V
CC
7
2
3
5
7
2
3
5
7
7
2
3
5
7
2
3
5
7
2
0.1
1.0
10
0.1
1.0
10
Output power, P -- W
Output power, P -- W
O
O
V
-- Rg
SVRR -- V
CC
NO
50
40
30
20
10
0
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
V
L
=13.2V
CC
R =4Ω
BPF=20Hz to 20kHz
Rg=0→0.12mV
R =4Ω
L
V =0dBm
R
f =100Hz
R
Rg=0
BPF=20Hz to 20kHz
7
2
3
5
7
2
3
5
7
2
8
9
10
11
12
13
14
15
16
17
18
19
1k
10k
100k
Signal source resistance, Rg -- Ω
Supply voltage, V
-- V
CC
SVRR -- V
SVRR -- f
R
R
50
40
30
20
10
0
50
40
30
20
10
0
V
=13.2V
V
=13.2V
CC
CC
L
R =4Ω
R =4Ω
L
Rg=0
f =100Hz
R
V =0dBm
Rg=0
R
BPF=20Hz to 20kHz
BPF=20Hz to 20kHz
0
200
400
600
800
1000
1200
0
5
7
2
3
5
7
2
100
1k
Power supply ripple, V -- mVrms
Ripple frequency, f -- Hz
R
R
No.A0195-5/9
LA4425A
I
-- Ta
V
-- Ta
N
CCO
80
60
40
20
0
10
V
=13.2V
V
=13.2V
CC
CC
R =4Ω
R =4Ω
L
L
Rg=0
Rg=0
8
6
4
2
0
-60
-40
-20
0
20
40
60
80
100
-60
-40
-20
0
20
40
60
80
100
Ambient temperature, Ta -- °C
Ambient temperature, Ta -- °C
P
-- Ta
O
6
5
4
3
2
1
V
=13.2V
V
=13.2V/4Ω
CC
CC
R =4Ω
Rg=0
L
f=1kHz
Switch"ON"locus
THD=10%
t
s
GND
0
-60
-40
-20
0
20
40
60
80
100
0.2s/div
Ambient temperature, Ta -- °C
V
=13.2V/4Ω
CC
Rg=0
"OFF"locus
GND
0.2s/div
No.A0195-6/9
LA4425A
Instructions and Precautions
• Connect a capacitor of 1000pF across pins and for external disturbance path.
• Be careful of the ground line artwork when laying out the printed circuit pattern. Arrange so that the Sg route and load
current flow-in route do not overlap. Refer to the recommended printed circuit pattern or make slits, etc. at pins
and .
DUAL Printed Circuit Pattern Example
GND
OUT1
1
IN1
V
GND
IN2
CC
1
OUT2
Cu-foiled side 45.0×75.0mm2
• Short Circuit Tests
+
SW1
SW2
SW3
+
13.2V
+
LA4425A
SW4
Our company's recommended printed circuit board: Apply V =13.2V using a 30×30×1.5mm3 thick aluminum board.
CC
The IC will be protected from the DC/AC shorting of switches 1 to 4 above. However, be careful not to damage the IC
by turning V
”ON” when DC short (SW 1 or SW 2) is on.
CC
• Power Supply Positive Surge
JASO tester
Application of giant pulse
2.2μF
+
0.15μF
13.2V
+
Rg
620Ω
LA4425A
1000μF
R
L
The over-voltage protector (V X ≈ 21.5V) inside the IC is used to cut all bias routes and reverse bias between B-E of
CC
output stage elements, in order to increase the power line’s capability of handling positive surge. This means, of course,
that a V
(V
) type output stage element is used instead of the V ) type.
(V
CES CBO
CEO CER
No.A0195-7/9
LA4425A
• Load Resistance and Misoperation
It should be noted that when R < 2Ω and V
is high, and the switch is turned “ON” when setting is for a signal
CC
L
(THD = 10%), the ground detector (current × voltage Schmitt circuit) operates momentarily.
• Precautions on TaB
If power voltage is applied to the IC substrate (the heat sink on a set), the IC structure is such that the PN junctions
may be burned, causing deterioration or destruction. Consult Our company’s Quality Assurance Department with
regard to the energy handling capability (voltage peak value, pulse width). Also, the IC TaB (substrate) is connected
to pin 3, large signal GND.
• Test of +V
to Output Pin
CC
Floating
+
+
b
+
LA4425A
a
13.2V
The power pin is in a floating state when a power capacitor is connected, so if +V
upper power transistor inside the IC will be damaged.
touches output lines a and b , the
CC
The LA4425A has a protective bypass route inside the IC.
• Starting Time (t )
s
This is set at 0.35sec/typ, but it can be made shorter by making input capacitor Ci smaller, or longer by making it
larger.
• Pop noise
The pop noise prevention circuit operates to reduce pop until Rg reaches 50kΩ. However, if Rg is left open, the
charging route of input capacitor Ci is lost, so the pop noise reduction circuit stops operating and click noises become
louder.
• VG/OSC
The voltage gain is fixed at 45dB inside the IC. It is impossible to change it externally.
Phase compensation capacitors (350pF/total) are connected between individual stages inside the IC, and the open
loop gain is low. In addition, the upper and lower drives are made equivalent so that final stage current gain is
adjusted, providing a measure against unwanted high-frequency parasitic oscillation peculiar to power IC’s.
• BTL Connection
Connection is impossible with IC alone.
• Reverse Mounting of IC
The pin assignment is such that there is no danger of damage.
• T.S.D (Thermal Shutdown) Operating Temperature
30×30×1.5mm3 thick Al board
Ta=25°C
0
20
40
60
80 100 120 140 160 180
Tc (°C)
No.A0195-8/9
LA4425A
T.S.D is capable of starting operation at Tc 120 to 130°C. When this is converted to junction temperature (Tj) according to
the formula below.
Tj ≈ 165C,
.
Tj = Qjc Pd + Tc
As T.S.D operation progresses, the output pin bias voltage drops, and it becomes harder to drive the upper waveform.
Therefore, the current (I ) and power (P ) show a tendency to decrease.
CC
O
Proper Cares in Mounting Radiator Fin
.
1. The mounting torque is in the range of 1. The mounting torque is in the range of 39 to 59 N cm.
2. The distance between screw holes of the radiator fin must coincide with the distance between screw holes of the IC.
3. The screw to be used must have a head equivalent to the one of truss machine screw or binder machine screw defined
by JIS. Washers must be also used to protect the IC case.
4. No foreign matter such as cutting particles shall exist between heat sink and radiator fin. When applying grease on
the junction surface, it must be applied uniformly on the whole surface.
5. Because the heat sink mounting tab and the heat sink are at the same electric potential as the chip’s GND, care must
be taken when mounting the heat sink on more than one device.
6. IC lead pins are soldered to the printed circuit board after the radiator fin is mounted on the IC.
ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number
of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed at
www.onsemi.com/site/pdf/Patent-Marking.pdf. SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no
warranty, representation or guarantee regarding the suitabilityof its products for any particular purpose, nor does SCILLC assume any liability arising out of the
application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental
damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual
performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical
experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use
as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in
which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for
any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors
harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or
death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the
part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PS No.3309-9/9
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LA4425PV
Monolithic Linear IC For Car Radio and Car Stereo 5W Power Amplifier with Very Few External Parts
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