LM395

LM195/LM395 Ultra Reliable Power Transistors June 1999 LM195/LM395 Ultra Reliable Power Transistors General Description The LM195/LM395 are fast, monolithic power transistors with complete overload protection. These devices, which act as high gain power transistors, have included on the chip, current limiting, power limiting, and thermal overload protection making them virtually impossible to destroy from any type of overload. In the standard TO-3 transistor power package, the LM195 will deliver load currents in excess of 1.0A and can switch 40V in 500 ns. The inclusion of thermal limiting, a feature not easily available in discrete designs, provides virtually absolute protection against overload. Excessive power dissipation or inadequate heat sinking causes the thermal limiting circuitry to turn off the device preventing excessive heating. The LM195 offers a significant increase in reliability as well as simplifying power circuitry. In some applications, where protection is unusually difficult, such as switching regulators, lamp or solenoid drivers where normal power dissipation is low, the LM195 is especially advantageous. The LM195 is easy to use and only a few precautions need be observed. Excessive collector to emitter voltage can destroy the LM195 as with any power transistor. When the device is used as an emitter follower with low source impedance, it is necessary to insert a 5.0k resistor in series with the base lead to prevent possible emitter follower oscillations. Although the device is usually stable as an emitter follower, the resistor eliminates the possibility of trouble without degrading performance. Finally, since it has good high frequency response, supply bypassing is recommended. For low-power applications (under 100 mA), refer to the LP395 Ultra Reliable Power Transistor. The LM195/LM395 are available in standard TO-3 power packages and solid Kovar TO-5. The LM195 is rated for operation from −55˚C to +150˚C and the LM395 from 0˚C to +125˚C. Features n n n n n n n n Internal thermal limiting Greater than 1.0A output current 3.0 µA typical base current 500 ns switching time 2.0V saturation Base can be driven up to 40V without damage Directly interfaces with CMOS or TTL 100% electrical burn-in Simplified Circuit DS006009-1 © 1999 National Semiconductor Corporation DS006009 www.national.com Connection Diagrams TO-3 Metal Can Package TO-220 Plastic Package DS006009-3 Case is Emitter DS006009-2 Bottom View Order Number LM195K/883 See NS Package Number K02A Top View Order Number LM395T See NS Package Number T03B TO-5 Metal Can Package DS006009-4 Bottom View Order Number LM195H/883 See NS Package Number H03B www.national.com 2 Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Collector to Emitter Voltage LM195 LM395 Collector to Base Voltage LM195 LM395 Base to Emitter Voltage (Forward) LM195 LM395 42V 36V 42V 36V 42V 36V Base to Emitter Voltage (Reverse) Collector Current Power Dissipation Operating Temperature Range LM195 LM395 Storage Temperature Range Lead Temperature (Soldering, 10 sec.) 20V Internally Limited Internally Limited −55˚C to +150˚C 0˚C to +125˚C −65˚C to +150˚C 260˚C Preconditioning 100% Burn-In In Thermal Limit Electrical Characteristics (Note 2) Parameter Collector-Emitter Operating Voltage (Note 4) Base to Emitter Breakdown Voltage Collector Current TO-3, TO-220 TO-5 Saturation Voltage Base Current Quiescent Current (IQ) Base to Emitter Voltage Switching Time Thermal Resistance Junction to Case (Note 3) VCE ≤ 15V VCE ≤ 7.0V IC ≤ 1.0A, TA = 25˚C 0 ≤ IC ≤ IMAX 0 ≤ VCE ≤ VCEMAX Vbe = 0 0 ≤ VCE ≤ VCEMAX IC = 1.0A, TA = +25˚C VCE = 36V, RL = 36Ω, TA = 25˚C TO-3 Package (K) TO-5 Package (H) TO-220 Package (T) 1.2 1.2 2.2 1.8 1.8 3.0 2.0 0.9 500 2.3 12 3.0 15 2.0 5.0 5.0 1.0 1.0 2.2 1.8 1.8 3.0 2.0 0.9 500 2.3 12 4 3.0 15 6 2.2 10 10 A A V µA mA V ns ˚C/W ˚C/W ˚C/W 0 ≤ VCE ≤ VCEMAX 42 36 60 V Conditions Min IQ ≤ IC ≤ IMAX LM195 Typ Max 42 Min LM395 Typ Max 36 V Units Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. Note 2: Unless otherwise specified, these specifications apply for −55˚C ≤ Tj ≤ +150˚C for the LM195 and 0˚C ≤ +125˚C for the LM395. Note 3: Without a heat sink, the thermal resistance of the TO-5 package is about +150˚C/W, while that of the TO-3 package is +35˚C/W. Note 4: Selected devices with higher breakdown available. Note 5: Refer to RETS195H and RETS195K drawings of military LM195H and LM195K versions for specifications. 3 www.national.com Typical Performance Characteristics Collector Characteristics (for K and T Packages) Bias Current Short Circuit Current DS006009-33 DS006009-34 DS006009-35 Quiescent Current Base Emitter Voltage Base Current DS006009-36 DS006009-37 DS006009-38 Saturation Voltage Response Time Response Time DS006009-39 DS006009-40 DS006009-41 www.national.com 4 Typical Performance Characteristics 10V Transfer Function (for K and T Packages) (Continued) 36V Transfer Function DS006009-7 DS006009-8 Transconductance Small Signal Frequency Response DS006009-9 DS006009-10 5 www.national.com Schematic Diagram DS006009-11 www.national.com 6 Typical Applications 1.0 Amp Voltage Follower DS006009-12 *Solid Tantalum Power PNP Time Delay DS006009-13 *Protects against excessive base drive **Needed for stability DS006009-14 1.0 MHz Oscillator 1.0 Amp Lamp Flasher DS006009-15 DS006009-16 7 www.national.com Typical Applications (Continued) 1.0 Amp Negative Regulator DS006009-17 †Solid Tantalum 1.0 Amp Positive Voltage Regulator DS006009-18 †Solid Tantalum www.national.com 8 Typical Applications (Continued) Optically Isolated Power Transistor Fast Optically Isolated Switch DS006009-19 DS006009-20 CMOS or TTL Lamp Interface Two Terminal Current Limiter 40V Switch DS006009-22 DS006009-23 DS006009-21 *Drive Voltage 0V to ≥ 10V ≤ 42V 6.0V Shunt Regulator with Crowbar Two Terminal 100 mA Current Regulator DS006009-25 DS006009-24 9 www.national.com Typical Applications (Continued) Power One-Shot Low Level Power Switch DS006009-26 Turn ON = 350 mV Turn OFF = 200 mV DS006009-27 T = R1C R2 = 3R1 R2 ≤ 82k Emitter Follower High Input Impedance AC Emitter Follower DS006009-28 *Need for Stability DS006009-29 Fast Follower DS006009-30 *Prevents storage with fast fall time square wave drive www.national.com 10 Typical Applications (Continued) Power Op Amp DS006009-31 *Adjust for 50 mA quiescent current †Solid Tantalum 6.0 Amp Variable Output Switching Regulator DS006009-32 *Sixty turns wound on Arnold Type A-083081-2 core. **Four devices in parallel †Solid tantalum 11 www.national.com Physical Dimensions inches (millimeters) unless otherwise noted TO-5 Metal Can Package Order Number LM195H/883 NS Package Number H03B TO-3 Metal Can Package Order Number LM195K/883 NS Package Number K02A www.national.com 12 LM195/LM395 Ultra Reliable Power Transistors Physical Dimensions inches (millimeters) unless otherwise noted (Continued) TO-220 Plastic Package Order Number LM395T NS Package Number T03B 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 AND GENERAL COUNSEL 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 Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com www.national.com National Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 1 80-530 85 85 English Tel: +49 (0) 1 80-532 78 32 Français Tel: +49 (0) 1 80-532 93 58 Italiano Tel: +49 (0) 1 80-534 16 80 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. 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