LM143/LM343 High Voltage Operational Amplifier General Description Features The LM143 is a general purpose high voltage operational amplifier featuring operation to g 40V, complete input overvoltage protection up to g 40V and input currents comparable to those of other super-b op amps. Increased slew rate, together with higher common-mode and supply rejection, insure improved performance at high supply voltages. Operating characteristics, in particular supply current, slew rate and gain, are virtually independent of supply voltage and temperature. Furthermore, gain is unaffected by output loading at high supply voltages due to thermal symmetry on the die. The LM143 is pin compatible with general purpose op amps and has offset null capability. Application areas include those of general purpose op amps, but can be extended to higher voltages and higher output power when externally boosted. For example, when used in audio power applications, the LM143 provides a power bandwidth that covers the entire audio spectrum. In addition, the LM143 can be reliably operated in environments with large overvoltage spikes on the power supplies, where other internally-compensated op amps would suffer catastrophic failure. The LM343 is similar to the LM143 for applications in less severe supply voltage and temperature environments. Y Y Y Y Y g 4.0V to g 40V Wide supply voltage range g 37V Large output voltage swing g 38V Wide input common-mode range Input overvoltage protection Full g 40V Supply current is virtually independent of supply voltage and temperature Unique Characteristics Y Y Y Y Y Y Y Low input bias current 8.0 nA Low input offset current 1.0 nA High slew rateÐessentially independent of temperature and supply voltage 2.5V/ms High voltage gainÐvirtually independent of resistive loading, temperature, and supply voltage 100k min Internally compensated for unity gain Output short circuit protection Pin compatible with general purpose op amps Connection Diagram Metal Can Package Top View TL/H/7783 – 1 Order Number LM143H, LM143H/883* or LM343H See NS Package Number H08C *Available per SMDÝ 7800303 C1995 National Semiconductor Corporation TL/H/7783 RRD-B30M115/Printed in U. S. A. LM143/LM343 High Voltage Operational Amplifier February 1995 Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. (Note 4) LM143 g 40V 680 mW 80V g 40V b 55§ C to a 125§ C b 65§ C to a 150§ C 5 seconds 300§ C Supply Voltage Power Dissipation (Note 1) Differential Input Voltage (Note 2) Input Voltage (Note 2) Operating Temperature Range Storage Temperature Range Output Short Circuit Duration Lead Temperature (Soldering, 10 sec.) ESD rating to be determined. LM343 g 34V 680 mW 68V g 34V 0§ C to a 70§ C b 65§ C to a 150§ C 5 seconds 300§ C Electrical Characteristics (Note 3) Parameter LM143 Conditions Min LM343 Typ Max Min Units Typ Max Input Offset Voltage TA e 25§ C 2.0 5.0 2.0 8.0 Input Offset Current TA e 25§ C 1.0 3.0 1.0 10 mV nA Input Bias Current TA e 25§ C 8.0 20 8.0 40 nA Supply Voltage Rejection Ratio TA e 25§ C 10 100 10 200 mV/V Output Voltage Swing TA e 25§ C, RL t 5 kX Large Signal Voltage Gain TA e 25§ C, VOUT e g 10V, RL t 100 kX 22 25 20 25 V 100k 180k 70k 180k V/V Common-Mode Rejection Ratio TA e 25§ C 80 90 70 90 dB Input Voltage Range TA e 25§ C Supply Current (Note 5) TA e 25§ C g 24 g 26 g 22 g 26 V 2.0 Short Circuit Current TA e 25§ C 20 20 mA Slew Rate TA e 25§ C, AV e 1 2.5 2.5 V/ms Power Bandwidth TA e 25§ C, VOUT e 40 Vp-p, RL e 5 kX, THD s 1% 20k 20k Hz Unity Gain Frequency TA e 25§ C 1.0M Input Offset Voltage TA e Max TA e Min Input Offset Current TA e Max TA e Min 0.8 1.8 4.5 7.0 Input Bias Current TA e Max TA e Min 5.0 16 35 35 Large Signal Voltage Gain RL t 100 kX, TA e Max RL t 100 kX, TA e Min 50k 50k 150k 220k 50k 50k 150k 220k V/V Output Voltage Swing RL t 5.0 kX, TA e Max RL t 5.0 kX, TA e Min 22 22 26 25 20 20 26 25 V 4.0 2.0 5.0 1.0M 6.0 6.0 mA Hz 10 10 mV 0.8 1.8 14 14 nA 5.0 16 55 55 nA Note 1: Absolute maximum ratings are not necessarily concurrent, and care must be taken not to exceed the maximum junction temperature of the LM143 (150§ C) or the LM343 (100§ C). For operating at elevated temperatures, devices in the H08 package must be derated based on a thermal resistance of 155§ C/W, junction to ambient, or 20§ C/W, junction to case. Note 2: For supply voltage less than g 40V for the LM143 and less than g 34V for the LM343, the absolute maximum input voltage is equal to the supply voltage. Note 3: These specifications apply for VS e g 28V. For LM143, TA e max e 125§ C and TA e min e b 55§ C. For LM343, TA e max e 70§ C and TA e min e 0§ C. Note 4: Refer to RETS143X for LM143H and LM1536H military specifications. Note 5: The maximum supply currents are guaranteed at VS e g 40V for the LM143 and VS e g 34V for the LM343. 2 TL/H/7783 – 2 Schematic Diagram 3 Typical Performance Characteristics Voltage Follower Slew Rate Supply Current Short Circuit Current Unity Gain Bandwidth Input Noise Voltage Input Noise Current Common-Mode Rejection Power Supply Rejection Large Signal Frequency Response Open Loop Frequency Response Voltage Follower Pulse Response Inverter Pulse Response TL/H/7783 – 4 4 Typical Performance Characteristics (Continued) Input Voltage Range Output Voltage Swing Voltage Gain Supply Current Input Current Voltage Gain TL/H/7783 – 3 Application Hints (See AN-127) The LM143 is designed for trouble free operation at any supply voltage up to and including the guaranteed maximum of g 40V. Input overvoltage protection, both common-mode and differential, is 100% tested and guaranteed at the maximum supply voltage. Furthermore, all possible high voltage destructive modes during supply voltage turn-on have been eliminated by design. As with most IC op amps, however, certain precautions should be observed to insure that the LM143 remains virtually blow-out proof. Although output short circuits to ground or either supply can be sustained indefinitely at lower supply voltages, these short circuits should be of limited duration when operating at higher supply voltages. Units can be destroyed by any combination of high ambient temperature, high supply voltages, and high power dissipation which results in excessive die temperature. This is also true when driving low impedance or reactive loads or loads that can revert to low impedance; for example, the LM143 can drive most general purpose op amps outside of the maximum input voltage range, causing heavy current to flow and possibly destroying both devices. Precautions should be taken to insure that the power supplies never become reversed in polarityÐeven under transient conditions. With reverse voltage, the IC will conduct excessive current, fusing the internal aluminum interconnects. Voltage reversal between the power supplies will almost always result in a destroyed unit. In high voltage applications which are sensitive to very low input currents, special precautions should be exercised. For example, with high source resistances, care should be taken to prevent the magnitude of the PC board leakage currents, although quite small, from approaching those of the op amp input currents. These leakage currents become larger at 125§ C and are made worse by high supply voltages. To prevent this, PC boards should be properly cleaned and coated to prevent contamination and to provide protection from condensed water vapor when operating below 0§ C. A guard ring is also recommended to significantly reduce leakage currents from the op amp input pins to the adjacent high voltage pins in the standard op amp pin connection as shown in Figure 1. Figures 2, 3 and 4 show how the guard ring is connected for the three most common op amp configurations. Finally, caution should be exercised in high voltage applications as electrical shock hazards are present. Since the negative supply is connected to the case, users may inadvertantly contact voltages equal to those across the power supplies. The LM143 can be used as a plug-in replacement in most general purpose op amp applications. The circuits presented in the following section emphasize those applications which take advantage of the unique high voltage abilities of the LM143. 5 Application Hints (See AN-127) (Continued) R1 e RSOURCE TL/H/7783 – 6 FIGURE 2. Guarded Voltage Follower TL/H/7783–5 Bottom View FIGURE 1. Printed Circuit Layout for Input Guarding with TO-5 Package R3 e R1 c R2 R1 a R2 TL/H/7783 – 8 FIGURE 4. Guarded Inverting Amplifier R3 a R1 c R2 e RSOURCE R1 a R2 TL/H/7783–7 FIGURE 3. Guarded Non-Inverting Amplifier TL/H/7783 – 14 FIGURE 5. Offset Voltage Adjustment 6 Typical Applications ³ (For more detail see AN-127) 130 Vp-p Drive Across a Floating Load TL/H/7783 – 9 g 34V Common-Mode Instrumentation Amplifier AV e #1 a 2 R1 R2 J R4 R5 *R2 may be adjustable to trim the gain. **R7 may be adjusted to compensate for the resistance tolerance of R4–R7 for best CMR. ³ The 38V supplies allow for a 5% voltage tolerance. All resistors are (/2 watt, except as noted. 7 WHERE: R4 e R6 R5 e R7 TL/H/7783 – 10 8 TL/H/7783 – 11 (Continued) (For more detail see AN-127) ³ The 38V supplies allow for a 5% voltage tolerance. All resistors are (/2 watt, except as noted. ² Put on common heat sink. All resistors are (/2 watt, 5%, except as noted. Tracking g 65V, 1 Amp Power Supply with Short Circuit Protection Typical Applications ³ Typical Applications ³ (Continued) (For more detail see AN-127) 90W Audio Power Amplifier with Safe Area Protection ² Put on common heat sink *34 turns of no. 20 wire on a */8× form **Adjust R6 to set IQ e 100 mA TL/H/7783 – 12 ³ The 38V supplies allow for a 5% voltage tolerance. All resistors are (/2 watt, except as noted. 9 Typical Applications ³ (Continued) (For more detail see AN-127) 1 Amp Power Amplifier with Short Circuit Protection TL/H/7783 – 13 ³ The 38V supplies allow for a 5% voltage tolerance. All resistors are (/2 watt, except as noted. 10 11 LM143/LM343 High Voltage Operational Amplifier Physical Dimensions inches (millimeters) Metal Can Package (H) Order Number LM143H, LM143H/883 or LM343H NS Package Number H08C 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. 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