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LM2917N-8 Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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LM2917N-8 Datasheet(HTML) 3 Page - National Semiconductor (TI) |
3 / 18 page Electrical Characteristics VCC e 12 VDC TA e 25 C see test circuit (Continued) Symbol Parameter Conditions Min Typ Max Units ZENER REGULATOR Regulator Voltage RDROP e 470X 756 V Series Resistance 105 15 X Temperature Stability a 1 mV C TOTAL SUPPLY CURRENT 38 6 mA Note 1 For operation in ambient temperatures above 25 C the device must be derated based on a 150 C maximum junction temperature and a thermal resistance of 101 CW junction to ambient for LM2907-8 and LM2917-8 and 79 CW junction to ambient for LM2907-14 and LM2917-14 Note 2 Hysteresis is the sum aVTH b (bVTH) offset voltage is their difference See test circuit Note 3 VOH is equal to c VCC b 1VBE VOL is equal to c VCC b 1VBE therefore VOH b VOL e VCC 2 The difference VOH b VOL and the mirror gain I2 I3 are the two factors that cause the tachometer gain constant to vary from 10 Note 4 Be sure when choosing the time constant R1 c C1 that R1 is such that the maximum anticipated output voltage at pin 3 can be reached with I3 c R1 The maximum value for R1 is limited by the output resistance of pin 3 which is greater than 10 MX typically Note 5 Nonlinearity is defined as the deviation of VOUT ( pin 3) for fIN e 5 kHz from a straight line defined by the VOUT 1 kHz and VOUT 10 kHz C1 e 1000 pF R1 e 68k and C2 e 022 mFd General Description (Continued) The op ampcomparator is fully compatible with the ta- chometer and has a floating transistor as its output This feature allows either a ground or supply referred load of up to 50 mA The collector may be taken above VCC up to a maximum VCE of 28V The two basic configurations offered include an 8-pin device with a ground referenced tachometer input and an internal connection between the tachometer output and the op amp non-inverting input This version is well suited for single speed or frequency switching or fully buffered frequency to voltage conversion applications The more versatile configurations provide differential ta- chometer input and uncommitted op amp inputs With this version the tachometer input may be floated and the op amp becomes suitable for active filter conditioning of the tachometer output Both of these configurations are available with an active shunt regulator connected across the power leads The reg- ulator clamps the supply such that stable frequency to volt- age and frequency to current operations are possible with any supply voltage and a suitable resistor Test Circuit and Waveform TLH7942 – 6 Tachometer Input Threshold Measurement TLH7942 – 7 3 |
Similar Part No. - LM2917N-8 |
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Similar Description - LM2917N-8 |
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