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LA4708N 데이터시트 PDF




ON Semiconductor에서 제조한 전자 부품 LA4708N은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 LA4708N 기능
기능 20W 2-channel BTL AF Power Amplifier
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LA4708N 데이터시트, 핀배열, 회로
Ordering number : ENA1783A
LA4708N
Monolithic Linear IC
20W 2-channel BTL AF Power
Amplifier for Car Stereo
http://onsemi.com
Overview
The LA4708N is a BTL two-channel power IC for car audio developed in pursuit of excellent sound quality. Low-region
frequency characteristics have been improved through the use of a new NF capacitor-less circuit, and crosstalk which
causes “muddy” sound has been reduced by improving both circuit and pattern layout. As a result, the LA4708N provides
powerful bass and clear treble. In addition, the LA4708N features on-chip protectors and standby switch.
Features
High power : supports total output of 30W 30W (VCC = 13.2V, THD = 30%, RL = 4)
Supports RL = 2(PO = 30W when VCC = 13.2V, THD = 10%)
Designed for excellent sound quality (fL 10Hz, fH = 130kHz)
NF capacitor-less
Any on time settable by external capacitor
Less pop noise
Standby switch circuit on chip (microprocessor supported)
Various protectors on chip (output-to-ground short/output-to-VCC short/load short/overvoltage/thermal shutdown circuit)
Specifications
Maximum Ratings at Ta = 25C
Parameter
Symbol
Conditions
Maximum supply voltage
VCC max 1 No signal, t = 60s
VCC max 2
Surge supply voltage
Maximum output current
Allowable power dissipation
VCC surge
IO peak
Pd max
t 0.2s, single giant pulse
Per channel
Arbitrarily large heat sink
Operating temperature
Topr
Storage temperature
Tstg
* Set VCC, RL in a range that does not exceed Pd max = 37.5W
Ratings
24
16
50
4.5
37.5
35 to 85
40 to 150
Unit
V
V
V
A
W
C
C
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed,
damage may occur and reliability may be affected.
ORDERING INFORMATION
See detailed ordering and shipping information on page 9 of this data sheet.
Semiconductor Components Industries, LLC, 2014
March, 2014
SIP18H
30314HK/61610SY 20100405-S0010 No.A1783-1/9




LA4708N pdf, 반도체, 판매, 대치품
Sample Print Pattern
LA4708N
VCC
+C5
R2
GND
C6 OUT1
C7
R3
OUT2
R4 C8
GND
R5 C9
1
+
+ C1 IN1
C2
R1
STB
+ C3
IN2
+ C4
Copper foil area 90 × 105mm2
Description of External Components
C1, C4
C2
C3
C5
Input capacitors
Decoupling capacitor
(ripple filter)
Amplifier on time setting
capacitor
Power supply capacitor
2.2F is recommended. fL can be varied by C1, C4 capacitances to adjust the bass range.
Approximately 0.8 second for 33F. Since the on time is proportional to this capacitance, it can
be set as desired by varying this capacitance. (Refer to the characteristics curve.)
C6, C7, C8, C9
R1
Oscillation blocking capacitors
Standby switch current
limiting resistor
Use polyester film capacitors (Mylar capacitors) with good temperature characteristics. (R2, R3,
R4, and R5 used jointly.) Since stability may be affected slightly by the pattern layout, etc.,
0.1F or more is recommended.
10kis recommended (when the applied voltage for the standby switch is 2.5V to 13.2V). This
resistor cannot be removed.
No. A1783-4/9

4페이지










LA4708N 전자부품, 판매, 대치품
LA4708N
PO -- f
24
22
THD = 10%
20
18
3%
16 1%
14 VCC = 13.2V
RL = 4Ω
12 Rg = 600Ω
VG = 40dB
Dual channel drive
10
10
2 3 5 7 100 2 3 5 7 1k
2 3 5 710k
Input frequency, f -- Hz
1.0
VCC = 13.2V
7 RL = 4Ω
5 DIN AUDIO
VNO -- Rg
2 3 57
JK470814
3
2
0.1
7
5
3
22 3
20
0
5 7 1k 2 3 5 7 10k 2 3 5 7 100k 2
Input resistance, Rg -- Ω
JK470816
SVRR -- fR
VCC = 13.2V
RL = 4Ω
Rg = 0
VCCR = 0dBm
-20
-40
OUT2
-60 OUT1
-80
The value of power supply capacitor is 0.47μF (Mylar)
-100
10
2 3 5 7 100 2 3 5 7 1k
2 3 5 7 10k 2 3 5 7100k
Ripple frequency, fR -- Hz
JK470818
2 RL = 4Ω
Rg = 600Ω
Pd, ICC -- PO
2
100 f = 1kHz
7 Dual channel drive
5
3
= 16V)
(V CC
I CC
10
7
5
3
2
10
7
Pd (V CC= 16V)
Pd (VCC = 13.2V)
2
1.0
7
55
3
27 0.1
2 3 5 7 1.0 2 3 5 7 10
Output power, PO -- W
3
2 3 5 72
JK470820
CH Sep -- f
20
VCC = 13.2V
RL = 4Ω
0 Rg = 10kΩ
VO = 0dBm
-20
-40
-60 CH1 CH2
CH2 CH1
-80
-100
10
2 3 5 7 100 2 3 5 7 1k
2 3 5 710k 2 3 5 7100k
Input frequency, f -- Hz
JK470815
SVRR -- VCC
0 RL = 4Ω
Rg = 0
fR = 100Hz
-20 VCCR = 0dBm
-40
OUT1
-60 OUT2
-80
2200μF (power supply capacitor)
is changed to 0.47μF (Mylar)
-1004
6 8 10 12 14 16 18 20
Supply voltage, VCC -- V
JK470817
0 SVRR -- VCCR
VCC = 13.2V
RL = 4Ω
fR = 100Hz/3kHz
-20
-40
fR = 100Hz
OUT2
OUT1
-60 OUT1
fR = 3kHz
OUT2
-80
The value of power supply capacitor is 0.47μF (Mylar)
Calculate as SVRR = 20 log VO
VCCR
-1000 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2
Power supply ripple voltage, VCCR -- Vrms JK470819
2 RL = 2Ω
Rg = 600Ω
Pd, ICC -- PO
100 f = 1kHz
7
Dual channel drive
Allowable power dissipation package
2
I CC
(V
= 16V)
CC
10
7
5 Pd max = 37.5W
5
33
2
= 16V)
Pd (VCC = 13.2V) 2
10 Pd (V CC
1.0
77
55
3
2 2 3 5 7 0.1 2 3 5 7 1.0 2 3 5 7 10
Output power, PO -- W
3
2 3 5 72
JK470821
No. A1783-7/9

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