LM2005

LM2005 20 Watt Automotive Power Amplifier April 1989 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 Y Y Y Y Wide supply range (8V–18V) Externally programmable gain With or without bootstrap Low distortion Low noise 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 Connection Diagram 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 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) Non-Repetitive Power Dissipation Operating Temperature Storage Temperature Lead Temp (Soldering 10 seconds) 3 5A 4 5A 30W b 40 C to a 85 C b 60 C to a 150 C 260 C LM2005T-M Electrical Characteristics Refer to the bridge application circuit Figure 1 Rth (heatsink) e 4 C W unless otherwise specified Parameter Supply Voltage Output Offset Voltage (Note 3) (between Pin 8 and 10) Total Quiescent Drain Current Includes Current in Feedback Resistors Output Power VS e 14 4V VS e 13 2V VS e 14 4V VS e 13 2V d e 10% VS e 14 4V VS e 13 2V THD RL e 4X RL e 3 2X f e 1 kHz RL e 4X RL e 3 2 X RL e 3 2X 18 20 17 Test Conditions Tamb e 25 C AV e 50 dB Typ Max 18 g 20 g 150 g 150 Min 8 Units V mV mV mA mA W W W 75 70 20 22 19 150 160 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 f e 1 kHz PO e 2W PO e 2W f e 1 kHz RL e 3 2X RL e 3 2X f e 1 kHz Rg e 10 kX (Note 4) Rg e 10 kX C4 e 10 mF VS e 14 4V PO e 20W PO e 22W VS e 13 2V PO e 19W VS e 14 4V VS e 13 2V fripple e 100 Hz Vripple e 0 5V f e 1 kHz RL e 4X RL e 3 2X f e 1 kHz RL e 3 2X RL e 4X RL e 3 2V 45 20 45 50 3 55 RL e 4X RL e 3 2X 70 9 8 1 1 % % mV mV kX Input Sensitivity Input Resistance Low Frequency Roll Off (b3 dB) High Frequency Roll Off (b3 dB) Closed Loop Voltage Gain Total Input Noise Voltage Supply Voltage Rejection Efficiency 40 Hz kHz dB 10 mV dB 60 60 58 2 % % % V Output Voltage with One Side of the Speaker Shorted to Ground 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 LM2005T-S Electrical Characteristics Refer to the stereo application circuit Figure 2 Rth (heatsink) e 4 C W unless otherwise specified Parameter Supply Voltage Quiescent Output Voltage Total Quiescent Drain Current Includes Current in Feedback Resistors Output Power (Each Channel) VS e 14 4V VS e 13 2V VS e 14 4V VS e 13 2V f e 1 kHz VS e 14 4V d e 10% RL e 4 X RL e 3 2 X RL e 2 X RL e 1 6 X RL e 3 2 X RL e 1 6 X RL e 2 X e 4X Tamb e 25 C Gv e 50 dB Min 8 66 6 72 66 65 62 6 7 9 10 6 9 65 8 10 11 65 10 12 Typ Max 18 78 72 120 120 Units V V V mA mA W W W W W W W Test Conditions VS e 13 2V VS e 16V THD (Each Channel) 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 k X 02 e 2X 1 1 1 1 % % % % dB dB mV 03 e 3 2X 02 e 1 6X 03 40 60 40 300 Cross Talk (Note 5) f e 1 kHz f e 10 kHz Input Saturation Voltage Input Sensitivity f e 1 kHz PO e 1W RL e 4 X RL e 3 2 X Non-Inverting Input Inverting Input Low Frequency Roll Off (b3 dB) High Frequency Roll Off (b3 dB) Voltage Gain (Open Loop) Voltage Gain (Closed Loop) Closed Loop Gain Matching Total Input Noise Voltage Supply Voltage Rejection Efficiency Rg e 10 kX (Note 6) Rg e 10 kX C3 e 10 mF VS e 14 4V RL e 4 X RL e 2 X VS e 13 2V RL e 3 2 X RL e 1 6X fripple e 100 Hz Vripple e 0 5V f e 1 kHz PO e 6 5W PO e 10W f e 1 kHz PO e 6 5W PO e 10W RL e 2X RL e 2X f e 1 kHz f e 1 kHz 6 55 70 200 10 50 15 90 48 50 05 15 35 45 5 51 mV kX kX Hz kHz dB dB dB mV dB Input Resistance f e 1 kHz 70 60 70 60 % % % % Note 5 For LM2005T-S only Note 6 Bandwidth filter 22 Hz to 22 kHz 3 Equivalent Schematic TL H 5129 – 3 4 External Components (Figure 2) Components 1 R1 R2 R5 R4 Comments Sets voltage gain R for one channel R1 R for the other AV e 1 a R5 Where R’ is the equivalent resistance of R2 in parallel with an internal 10k resistor AV j 1 a 10k  R2 R2 a 10k If R2 m 10k then Re AV j 1 a 2 R3 3 RO CO R2 R1 Components 5 C4 C5 6 C3 Comments Bootstrap capacitors used to increase drive to output stage Improves power supply rejection Increasing C3 increases turn-on delay (approximately 2 ms per mF) Inverting input DC decouple Low frequency pole 1 2qZ(inverting)C2 Z (inverting) 10 kX FL2 e 8 CC Output coupling capacitor Isolates pins 10 and 8 from load Low frequency pole FL3 e 9 CS 1 2qRLCC 7 C2 C6 Adjusts output symmetry for maximum power output Works to stabilize internal output stage Necessary for stability CO should be ceramic disc or equivalently good high frequency capacitor Input coupling capacitor Low frequency pole set by 1 2qZ (non-inverting) C1 Decreasing capacitor value will also increase noise FL1 e Power supply filtering 4 C1 C9 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 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 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 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 107847 11-Lead TO-220 Power Package (T) Order Number LM2005T-S or LM2005T-M NS Package Number T11A LIFE SUPPORT POLICY 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 systems which (a) are intended for surgical implant into the body or (b) support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in a significant injury to the user National Semiconductor Corporation 1111 West Bardin Road Arlington TX 76017 Tel 1(800) 272-9959 Fax 1(800) 737-7018 2 A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness National Semiconductor Europe Fax (a49) 0-180-530 85 86 Email cnjwge tevm2 nsc com Deutsch Tel (a49) 0-180-530 85 85 English Tel (a49) 0-180-532 78 32 Fran ais Tel (a49) 0-180-532 93 58 Italiano Tel (a49) 0-180-534 16 80 National Semiconductor Hong Kong Ltd 13th Floor Straight Block Ocean Centre 5 Canton Rd Tsimshatsui Kowloon Hong Kong Tel (852) 2737-1600 Fax (852) 2736-9960 National Semiconductor Japan Ltd Tel 81-043-299-2309 Fax 81-043-299-2408 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