Datasheet LM2005T-S Datasheet (NSC)

LM2005 20 Watt Automotive Power Amplifier

LM2005 20 Watt Automotive Power Amplifier

April 1989

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.

Features

Y

Wide supply range (8V –18V)

Y

Externally programmable gain

Y

With or without bootstrap

Y

Low distortion

Y

Low noise

Connection Diagram

Plastic Package

Typical Application

Y

High peak current capability

Y

e

P

20W bridge

O

Y

High voltage protection

Y

AC and DC output short circuit protection to ground or
across load

Y

Thermal protection

Y

Inductive load protection

Y

Accidental open ground protection

Y

Immunity to 40V power supply transients

Y

3§C/W device dissipation

Y

Pin for pin compatible with TDA2005

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

C

1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.

TL/H/5129

LM2005T-M and LM2005T-S
Absolute Maximum Ratings

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

Output Current

Repetitive (Note 2) 3.5A
Non-Repetitive 4.5A

Power Dissipation 30W

Operating Temperature

Storage Temperature

b

40§Ctoa85§C

b

60§Ctoa150§C

Lead Temp. (Soldering, 10 seconds) 260

C

§

LM2005T-M
Electrical Characteristics

R

th (heatsink)

e

4§C/W, unless otherwise specified

Refer to the bridge application circuit,

Figure 1

,T

amb

e

Parameter Test Conditions Min Typ Max Units

Supply Voltage 818V

Output Offset Voltage (Note 3) V
(between Pin 8 and 10) V

Total Quiescent Drain Current V
Includes Current in Feedback Resistors V

e

14.4V

S

e

13.2V

S

e

14.4V R

S

e

13.2V R

S

g

e

4X 75 150 mA

L

e

3.2X 70 160 mA

L

Output Power de10% fe1 kHz

e

V

S

e

V

S

14.4V R

13.2V R

e

4X 18 20 W

L

e

R

3.2X 20 22 W

L

e

3.2X 17 19 W

L

THD fe1 kHz

e

V

14.4V R

S

e

P

50 mW to 15W 1 %

O

e

V

13.2V R

S

e

P

50 mW to 13W 1 %

O

e

4X

L

e

3.2X

L

Input Sensitivity fe1 kHz

e

P

2W R

O

e

P

2W R

O

e

4X 9mV

L

e

3.2X 8mV

L

Input Resistance fe1 kHz 70 kX

Low Frequency Roll Off (b3 dB) R

High Frequency Roll Off (b3 dB) R

e

3.2X 40 Hz

L

e

3.2X 20 kHz

L

Closed Loop Voltage Gain fe1 kHz 45 50 dB

Total Input Noise Voltage R

Supply Voltage Rejection R

Efficiency V

Output Voltage with One Side V
of the Speaker Shorted to Ground V

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.

e

10 kX (Note 4) 3 10 mV

g

e

10 kX f

g

e

C

10 mFV

4

e

14.4V fe1 kHz

S

e

P

20W R

O

e

P

22W R

O

e

V

13.2V fe1 kHz

S

e

P

19W R

O

e

14.4V R

S

e

13.2V R

S

e

100 Hz

ripple

e

0.5V

ripple

e

4X 60 %

L

e

3.2X 60 %

L

e

3.2X 58 %

L

e

4X

L

e

3.2V

L

45 55 dB

25§C, A

20

e

50 dB,

V

g

150 mV

g

150 mV

2V

2

LM2005T-S
Electrical Characteristics

R

th (heatsink)

e

4§C/W, unless otherwise specified

Refer to the stereo application circuit,

Figure 2,

e

T

amb

Parameter Test Conditions Min Typ Max Units

Supply Voltage 818V

Quiescent Output Voltage V

Total Quiescent Drain Current V
Includes Current in Feedback Resistors V

e

14.4V 6.6 7.2 7.8 V

S

e

V

13.2V 6 6.6 7.2 V

S

e

14.4V 65 120 mA

S

e

13.2V 62 120 mA

S

Output Power fe1 kHz de10%
(Each Channel) V

e

14.4V R

S

e

V

13.2V R

S

e

V

16V R

S

e

4X 6 6.5 W

L

e

R

3.2X 78 W

L

e

R

2X 910 W

L

e

R

1.6X 10 11 W

L

e

3.2X 6 6.5 W

L

e

R

1.6X 910 W

L

e

2X 12 W

L

THD fe1 kHz
(Each Channel) V

Cross Talk V
(Note 5) R

e

14.4V R

S

e

P

50 mW to 4W 0.2 1 %

O

e

V

14.4V R

S

e

P

50 mW to 6W 0.3 1 %

O

e

V

13.2V R

S

e

P

50 mW to 3W 0.2 1 %

O

e

V

13.2V R

S

e

P

40 mW to 6W 0.3 1 %

O

e

14.4V

S

e

4X

L

e

V

4V

O

rms

e

R

5kX

g

e

4X

L

e

2X

L

e

3.2X

L

e

1.6X

L

e

f

1 kHz 40 60 dB

fe10 kHz 40 dB

Input Saturation Voltage 300 mV

Input Sensitivity fe1 kHz P

e

1W

O

e

R

4X 6

L

e

R

3.2X 5.5

L

Input Resistance fe1 kHz Non-Inverting Input 70 200 kX

Inverting Input 10 kX

Low Frequency Roll Off (b3 dB) R

High Frequency Roll Off (b3 dB) R

e

2X 50 Hz

L

e

2X 15 kHz

L

Voltage Gain (Open Loop) fe1 kHz 90 dB

Voltage Gain (Closed Loop) fe1 kHz 48 50 51 dB

Closed Loop Gain Matching 0.5 dB

Total Input Noise Voltage R

Supply Voltage Rejection R

Efficiency V

Note 5: For LM2005T-S only.

Note 6: Bandwidth filter: 22 Hz to 22 kHz.

e

10 kX (Note 6) 1.5 5 mV

g

e

10 kX f

g

e

C

10 mFV

3

e

14.4V fe1 kHz

S

e

R

4X P

L

e

R

2X P

L

e

V

13.2V fe1 kHz

S

e

R

3.2X P

L

e

R

1.6X P

L

e

100 Hz

ripple

e

0.5V

ripple

e

6.5W 70 %

O

e

10W 60 %

O

e

6.5W 70 %

O

e

10W 60 %

O

35 45 dB

25§C, G

e

50 dB,

v

mV

3

Equivalent Schematic

TL/H/5129– 3

4

External Components

(Figure 2)

Components Comments

1. R1, R2 Sets voltage gain,
R5, R4

R

Ê

j

a

1

e1a

for one channel,

R1

R

Ê

for the other.

R5

A

V

A

V

Where R’ is the equivalent resistance
of R2 in parallel with an internal 10k
resistor:

10k#R2

R2a10k

.

e

R

Ê

If R2m10k, then

R2

.

j

a

1

A

V

R1

2. R3 Adjusts output symmetry for maximum

power output.

3. R

O,CO

Works to stabilize internal output
stage. Necessary for stability. C
should be ceramic disc or equivalently

O

good high frequency capacitor.

4. C1, C9 Input coupling capacitor. Low

frequency pole set by

e

1

F

L

2qZ (non-inverting) C1

1

.

Decreasing capacitor value will also
increase noise.

Typical Applications (Continued)

Components Comments

5. C4, C5 Bootstrap capacitors, used to increase
drive to output stage.

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:

e

F

2

L

2qZ(inverting)C2

1

.

Z (inverting)&10 kX.

8. C

C

Output coupling capacitor. Isolates
pins 10 and 8 from load. Low
frequency pole;

1

2qRLC

.

C

9. C

e

3

F

L

S

Power supply filtering.

FIGURE 2. 10W/Channel Stereo Amplifier Application and Test Circuit

5

TL/H/5129– 4

Typical Performance Characteristics

Device Dissipation vs
Ambient Temperature

Supply Current vs
Supply Voltage

Output Offset Voltage vs
Supply Voltage

Power Output vs
Supply Voltage

Total Harmonic Distortion
vs Power Output (Bridge)

Channel Separation
(Referred to the Output)
vs Frequency

Output Swing vs
Supply Voltage

Total Harmonic Distortion
vs Power Output (Dual)

Total Harmonic Distortion
vs Frequency (Dual)

Power Supply Rejection
Ratio (Referred to the
Output) vs Frequency

Power Output vs Supply
Voltage

TL/H/5129– 5

6

Application Hints

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

e

V
method.

DC(VS

14.4V, R

The LM2005 can withstand a constant 28 V
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

e

4X), by an internal current pullback

L

on the supply

DC

supply or less than ground levels. The protection diodes will
clamp these transients to a safe V
rails.

The bridge configuration in

Figure 3

above and below the

BE

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.

e

A

41.5 dB@1 kHz FIGURE 3. Minimal Component Application Circuit

V

Component Side (Scale 2:1)

FIGURE 4. Printed Circuit Board Layout for LM2005

TL/H/5129– 6

TL/H/5129– 7

7

Physical Dimensions inches (millimeters) Lit.

LM2005 20 Watt Automotive Power Amplifier

Ý

107847

11-Lead TO-220 Power Package (T)

Order Number LM2005T-S or LM2005T-M

NS Package Number T11A

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NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are devices or 2. A critical component is any component of a life
systems which, (a) are intended for surgical implant support device or system whose failure to perform can
into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life
failure to perform, when properly used in accordance support device or system, or to affect its safety or
with instructions for use provided in the labeling, can effectiveness.
be reasonably expected to result in a significant injury
to the user.

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Corporation Europe Hong Kong Ltd. Japan Ltd.

1111 West Bardin Road Fax: (
Arlington, TX 76017 Email: [e-mail] Ocean Centre, 5 Canton Rd. Fax: [phone]
Tel: [phone] Deutsch Tel: (
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National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.

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a

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a

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a

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