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
Maximum supply voltage
Surge maximum supply voltage
Maximum output current
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VCC max
VCC surge
IO peak
Pd max
Topr
Tstg
With infinite heat sink
Rg = 0
Giant pulse 200ms
Rise time 1ms
3.3
7.5
-30 to +80
-40 to +150
A
W
°C
°C
Conditions
Ratings
18
50
Unit
V
V
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
Recommended supply voltage
Recommended load resistance
Operating voltage range
Operating load resistance range
Symbol
VCC
RL
VCC op
RL op
Under conditions where maximum ratings are
not exceeded
Conditions
Ratings
13.2
4
5 to 16
2 to 8
Unit
V
Ω
V
Ω
Electrical Characteristics
at Ta
=
25°C, VCC = 13.2V, RL = 4Ω, f = 1 kHz, Rg = 600Ω,
specified board/specified circuit, 30×30×1.5mm
3
thick aluminum used
Ratings
Parameter
Quiescent current
Voltage gain
Output power
Symbol
ICCO
VG
PO1
PO2
Total harmonic distortion
Output noise voltage
Ripple rejection ratio
THD
VNO
SVRR1
VO = 0dBm
13.2 V / 4Ω, THD = 10%
14.4 V / 4Ω, THD = 10%
VO = 2V
Rg = 0, BPF = 20 Hz to 20 kHz
Rg = 0, BPF = 20 Hz to 20 kHz
VR = 0dBm, fR = 100Hz
SVRR2
Rg = 0, BPF = 20 Hz to 20 kHz
VR = 0dBm, fR = 100 Hz
Over-voltage attack
Starting time
Input resistance
Roll-off frequency
VCCX
tS
RIN
fL
fH
Thermal operating temperature
Tc
Rg = 0
21.5
0.35
50
40
90
125
V
s
kΩ
Hz
kHz
°C
47
dB
30
30
43
4
5
Conditions
min
typ
65
45
5
6
0.1
40
40
1.0
max
130
47
mA
dB
W
W
%
dB
dB
Unit
Package Dimensions
unit : mm (typ)
3031C
10
Pd max -- Ta
Al heat sink
mounting toque 39N.cm
with sillicone grease applied.
9.5
3.2
(2.0)
2.7
Allowable power dissipation, Pd max -- W
8
7.5
Infinite heat sink
100×100×1.5mm
3
50×50×1.5mm
3
12
°
C
/
W
(2.0)
14.25max
(11.8)
6
5.7
4.3
4
2.9
2
1.2
10.0
30×30×1.5mm
3
No heat sink
0.51min
1.1
1.5
13.0
0
-30 -20
0
20
40
60
80
100
Ambient temperature, Ta --
°C
1
(0.75)
2.0
5
0.6
0.5
1.2
SANYO : SIP5H
No.A0195-2/9
LA4425A
Sample Application Circuit
VCC 13.2V
Ci 2.2μF
+
5
+
1000μF
Co 1000μF
1
LA4425A
2
3
4
+
•
On-chip overvoltage protection
•
On-chip thermal protection
•
On-chip pop noise reducing circuit
•
On-chip output D.C. short protection
speaker
4Ω
Pin Voltage
at VCC = 13.2V
Characteristics
Pin No.
Pin voltage
(reference value)
Input
1
(≈ 2VBE)
1.4V
Small signal
GND
2
0V
Large signal
GND
3
0V
Output
4
(≈ 1/2VCC)
6.5V
VCC
5
(VCC)
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
Feedback capacitor
Filter capacitor
Phase compensation capacitor
Oscillation correction polyester
film capacitor
Oscillation correction resistor
Total
Our ICs now in use
8 pcs.
LA4425A
-
-
-
-
-
-
2 pcs.
Note: The power supply capacitor is not counted as a power IC part.
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