NSC LM2005T-S Lm2005 20 watt automotive power amplifier Datasheet

LM2005 20 Watt Automotive Power Amplifier
General Description
The LM2005 is a dual high power amplifier, designed to
deliver optimum performance and reliability for automotive
applications. High current capability (3.5A) enables the device to deliver 10W/channel into 2X (LM2005T-S), or 20W
bridged monaural (LM2005T-M) into 4X, with low distortion.
Y
Y
Y
Y
Y
Features
Y
Y
Y
Y
Y
Y
Wide supply range (8V–18V)
Externally programmable gain
With or without bootstrap
Low distortion
Low noise
Connection Diagram
Y
Y
Y
Y
High peak current capability
PO e 20W bridge
High voltage protection
AC and DC output short circuit protection to ground or
across load
Thermal protection
Inductive load protection
Accidental open ground protection
Immunity to 40V power supply transients
3§ C/W device dissipation
Pin for pin compatible with TDA2005
Typical Application
Plastic Package
TL/H/5129–1
Order Number LM2005T-S
or LM2005T-M
See NS Package Number TA11A
TL/H/5129 – 2
FIGURE 1. 20W Bridge Amplifier Application and Test Circuit
C1995 National Semiconductor Corporation
TL/H/5129
RRD-B30M115/Printed in U. S. A.
LM2005 20 Watt Automotive Power Amplifier
April 1989
LM2005T-M and LM2005T-S
Absolute Maximum Ratings
Output Current
Repetitive (Note 2)
Non-Repetitive
Power Dissipation
Operating Temperature
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Operating Supply Voltage
18V
DC Supply Voltage (Note 1)
28V
Peak Supply Voltage (50 ms)
40V
3.5A
4.5A
30W
b 40§ C to a 85§ C
Storage Temperature
Lead Temp. (Soldering, 10 seconds)
b 60§ C to a 150§ C
260§ C
LM2005T-M
Electrical Characteristics Refer to the bridge application circuit, Figure 1 , Tamb e 25§ C, AV e 50 dB,
Rth (heatsink) e 4§ C/W, unless otherwise specified
Parameter
Test Conditions
Supply Voltage
Output Offset Voltage (Note 3)
(between Pin 8 and 10)
Total Quiescent Drain Current
Includes Current in Feedback Resistors
VS e 14.4V
VS e 13.2V
RL e 4X
RL e 3.2X
Output Power
d e 10%
VS e 14.4V
f e 1 kHz
RL e 4X
RL e 3.2X
RL e 3.2X
g 20
VS e 13.2V
Input Sensitivity
75
70
18
20
17
f e 1 kHz
PO e 2W
PO e 2W
RL e 4X
RL e 3.2X
Max
Units
18
V
g 150
g 150
mV
mV
150
160
mA
mA
20
22
19
f e 1 kHz
VS e 14.4V
RL e 4X
PO e 50 mW to 15W
VS e 13.2V
RL e 3.2X
PO e 50 mW to 13W
W
W
W
1
%
1
%
9
8
Input Resistance
f e 1 kHz
Low Frequency Roll Off (b3 dB)
RL e 3.2X
High Frequency Roll Off (b3 dB)
RL e 3.2X
20
Closed Loop Voltage Gain
f e 1 kHz
45
Total Input Noise Voltage
Rg e 10 kX (Note 4)
Supply Voltage Rejection
Rg e 10 kX
C4 e 10 mF
fripple e 100 Hz
Vripple e 0.5V
Efficiency
VS e 14.4V
PO e 20W
PO e 22W
VS e 13.2V
PO e 19W
f e 1 kHz
RL e 4X
RL e 3.2X
f e 1 kHz
RL e 3.2X
VS e 14.4V
VS e 13.2V
RL e 4X
RL e 3.2V
Output Voltage with One Side
of the Speaker Shorted to Ground
Typ
8
VS e 14.4V
VS e 13.2V
THD
Min
mV
mV
70
kX
40
Note 1: Internal voltage limit. Shuts down above 20V.
Note 2: Internal current limit.
Note 3: For LM2005T-M only.
Note 4: Bandwidth filter: 22 Hz to 22 kHz.
2
50
3
45
Hz
kHz
dB
10
mV
55
dB
60
60
%
%
58
%
2
V
LM2005T-S
Electrical Characteristics Refer to the stereo application circuit, Figure 2, Tamb e 25§ C, Gv e 50 dB,
Rth (heatsink) e 4§ C/W, unless otherwise specified
Parameter
Test Conditions
Supply Voltage
VS e 14.4V
VS e 13.2V
Total Quiescent Drain Current
Includes Current in Feedback Resistors
VS e 14.4V
VS e 13.2V
Output Power
(Each Channel)
f e 1 kHz
VS e 14.4V
6.6
6
d e 10%
RL e 4X
RL e 3.2X
RL e 2X
RL e 1.6X
RL e 3.2X
RL e 1.6X
RL e 2X
VS e 13.2V
VS e 16V
Cross Talk
(Note 5)
f e 1 kHz
VS e 14.4V
RL
PO e 50 mW to 4W
VS e 14.4V
RL
PO e 50 mW to 6W
VS e 13.2V
RL
PO e 50 mW to 3W
VS e 13.2V
RL
PO e 40 mW to 6W
VS e 14.4V
RL e 4X
VO e 4 Vrms
Rg e 5 kX
Input Resistance
6
7
9
10
6
9
Max
V
7.2
6.6
7.8
7.2
V
V
65
62
120
120
mA
mA
6.5
8
10
11
6.5
10
12
W
W
W
W
W
W
W
0.2
1
%
0.3
1
%
0.2
1
%
0.3
1
%
e 2X
e 3.2X
e 1.6X
f e 1 kHz
40
f e 10 kHz
60
dB
40
dB
300
f e 1 kHz
PO e 1W
RL e 4X
RL e 3.2X
f e 1 kHz
Non-Inverting Input
RL e 2X
High Frequency Roll Off (b3 dB)
RL e 2X
Voltage Gain (Open Loop)
f e 1 kHz
Voltage Gain (Closed Loop)
f e 1 kHz
mV
6
5.5
70
Inverting Input
Low Frequency Roll Off (b3 dB)
mV
200
kX
10
kX
50
15
Closed Loop Gain Matching
50
dB
51
dB
5
mV
0.5
Total Input Noise Voltage
Rg e 10 kX (Note 6)
Supply Voltage Rejection
Rg e 10 kX
C3 e 10 mF
fripple e 100 Hz
Vripple e 0.5V
Efficiency
VS e 14.4V
RL e 4X
RL e 2X
VS e 13.2V
RL e 3.2X
RL e 1.6X
f e 1 kHz
PO e 6.5W
PO e 10W
f e 1 kHz
PO e 6.5W
PO e 10W
Note 6: Bandwidth filter: 22 Hz to 22 kHz.
3
1.5
35
Hz
kHz
90
48
Note 5: For LM2005T-S only.
Units
18
e 4X
Input Saturation Voltage
Input Sensitivity
Typ
8
Quiescent Output Voltage
THD
(Each Channel)
Min
dB
45
dB
70
60
%
%
70
60
%
%
Equivalent Schematic
TL/H/5129 – 3
4
External Components (Figure 2)
Components
1. R1, R2
R5, R4
Comments
Sets voltage gain,
Components
5. C4, C5
Comments
Bootstrap capacitors, used to increase
drive to output stage.
RÊ
for one channel,
R1
RÊ
for the other.
AV e 1 a
R5
Where R’ is the equivalent resistance
of R2 in parallel with an internal 10k
resistor:
6. C3
Improves power supply rejection.
Increasing C3 increases turn-on delay
(approximately 2 ms per mF).
7. C2, C6
Inverting input DC decouple. Low
frequency pole:
AV j 1 a
1
.
2qZ(inverting)C2
Z (inverting) & 10 kX.
FL2 e
10k # R2 .
R2 a 10k
If R2 m 10k, then
RÊ e
AV j 1 a
8. CC
R2 .
R1
2. R3
Adjusts output symmetry for maximum
power output.
3. RO, CO
Works to stabilize internal output
stage. Necessary for stability. CO
should be ceramic disc or equivalently
good high frequency capacitor.
4. C1, C9
Input coupling capacitor. Low
frequency pole set by
Output coupling capacitor. Isolates
pins 10 and 8 from load. Low
frequency pole;
FL3 e
9. CS
1
.
2qRLCC
Power supply filtering.
1
.
2qZ (non-inverting) C1
Decreasing capacitor value will also
increase noise.
FL1 e
Typical Applications (Continued)
TL/H/5129 – 4
FIGURE 2. 10W/Channel Stereo Amplifier Application and Test Circuit
5
Typical Performance Characteristics
Device Dissipation vs
Ambient Temperature
Supply Current vs
Supply Voltage
Output Offset Voltage vs
Supply Voltage
Power Output vs
Supply Voltage
Output Swing vs
Supply Voltage
Total Harmonic Distortion
vs Frequency (Dual)
Total Harmonic Distortion
vs Power Output (Bridge)
Total Harmonic Distortion
vs Power Output (Dual)
Power Supply Rejection
Ratio (Referred to the
Output) vs Frequency
Channel Separation
(Referred to the Output)
vs Frequency
Power Output vs Supply
Voltage
TL/H/5129 – 5
6
Application Hints
supply or less than ground levels. The protection diodes will
clamp these transients to a safe VBE above and below the
rails.
The bridge configuration in Figure 3 is designed for applications requiring minimal printed circuit board area and maximum cost effectiveness. The circuit will function with the
elimination of bootstrap components R3, C4 and C5 (refer
to Figure 1 ). This will result in less output power by decreasing output voltage swing to the load. By using internal feedback resistors (typically 10 kX), feedback components R2,
R3 and C2 (Figure 1 ) may be omitted where closed loop
voltage gain accuracy is not critical. The net result is a stable, cost effective circuit that will satisfy many application
needs.
The high current capability of the LM2005 allows it to continuously endure either AC or DC short circuit of the output
with a maximum supply voltage of 16V. This will protect the
loudspeaker in a bridge mode, when a DC short of the output occurs on one side of the speaker. The device will prevent the speaker from destruction by reducing the DC
across the load (bridge mode) to typically less than 2
VDC(VS e 14.4V, RL e 4X), by an internal current pullback
method.
The LM2005 can withstand a constant 28 VDC on the supply
with no damage (maximum operating voltage is 18V). The
device is also protected from load dump or dangerous transients up to 40V for 50 ms (every 1000 ms) on the supply
with no damage.
Protection diodes protect the device driving inductive loads,
during which the load can generate voltages greater than
TL/H/5129 – 6
AV e 41.5 dB
@
1 kHz
FIGURE 3. Minimal Component Application Circuit
Component Side (Scale 2:1)
TL/H/5129 – 7
FIGURE 4. Printed Circuit Board Layout for LM2005
7
LM2005 20 Watt Automotive Power Amplifier
Physical Dimensions inches (millimeters)
Lit. Ý 107847
11-Lead TO-220 Power Package (T)
Order Number LM2005T-S or LM2005T-M
NS Package Number T11A
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