6542 ETC2
Document overview
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Technical content
2125" ANY MOUNTING POSITION MAX, eee BOTTOM VIEW 5" 2,046" TINNED MIN. USM GLE VERS 0.096" CENTER TO CENTER GLASS BULB THE 6542 1S A TWO ELECTRODE, INERT-GAS-FILLED COLD CATHODE SUBMINIATURE TUBE INTENDED FOR USE AS A VOLTAGE REGULATOR. THE TUBE HAS A MAINTAINING VOLTAGE OF APPROXIMATELY 150 VOLTS OVER A CURRENT RANGE OF 5 TO 25 MA. THE 6542 IS EXCELLENT FOR APPLICATIONS WHICH REQUIRE GOOD VOLTAGE REG ULATION AND LONG LIFE, CONSISTENT WITH SMALL SIZE AND LOW WEIGHT. ELECTRICAL DATA CATHODE couo ‘ MECHANICAL DATA i MOUNTING POSITION any MAXIMUM OVERALL LENGTH 2.125 inches MAXIMUM DIAMETER 0.400 IncHes WEIGHT (APPROX) 0.16 ounces auLe 3 BASE SUB-MINIATURE FLAT PRESS WITH 3 FLYING Leaos CONTINUED ON FOLLOFING PAGE TORG-SOT ELECTRIC Two. ELECTOR TUBE DIVISION, BLOOMFIELD, HE VERSEY, UeeAr OECEMOER Ly IDDE PLATE BONES
CONTINUED FROM PRECEDING PAGE RATINGS avsowure vaives MAXIMUM OC CATHODE CURRENT 25 Ma. MINIMUM 0C CATHODE CURRENT 5 wa. MAXIMUM BUL® TEMPERATURE 155 ®c MINIMUM AMSIENT TEMPERATURE ~55 °c MAXIMUM. ALTITUDE 60 000 Feet CIRCUIT VALUES MAXIMUM SHUNT CAPACITOR 0.1 at SERIES RESISTOR SEE OPERATION NOTES. EQUIPMENT DESIGN AND RANGE VALUES ni ava. wax. OC ANODE SUPPLY VOLTAGE est -—- vouts ANODE BREAKDOWN VOLTAGE _- 150 180 vouts TUBE VOLTAGE oROP 1uo 147 168 vouts REGULATION (5 TO SO MA.) _ 0.8 6 vouTs
1 ORDER TO ASSURE STARTING THROUGH TUBE LIFE NOT LESS THAN THE SPECIFIED SUPPLY VOLTAGE
SHOULD HE PROVIDED. CONTINUED On FOLLOWING PASE
CONTINUED FROM PRECEDING PAGE OPERATING NOTES INTHE OPERATION OF AGLOW TUBE THERE ARE SEVERAL REQUIREMENTS WHICH MUST ALWAYS BE MET, THE FIRST IS THAT THE SUPPLY VOLTAGE MUST ALWAYS BE GREATER THAN THE ANODE BREAKOOWN VOLTAGE AND THE SECOND 1S THAT SUF~ FICIENT RESISTANCE MUST ALWAYS BE PUT IN SERIES WiTH THE TUBE INOR— DER TO LIMIT THE CURRENT TO THE MINIMUM AND MAXIMUM VALUES GIVEN IM THE RATINGS. IN QROER TO ILLUSTRATE HOW TO CALCULATE THE VALUE OF THE SERIES RESIS TANCE A TYPICAL REGULATOR CIRCUIT 18 SHOWN IN FIGURE 4. FROM FIGURE 4 WE SEE THAT V4 1S THE UNREGULATED SUPPLY VOLTAGE, v2.15 THE TUBE VOLTAGE OROP ON THE REGULATED VOLTAGE SUPPLIED TO THE LOAD, Ry 15 THE SERIES LIMITING RESISTOR, @ 1S THE VARIABLE LOAD, Ty IS THE TUBE CURRENT ANO I, 1S THE LOAD CURRENT. WE SEE THAT THE TUBE CURRENT WILL GE A MAXIMUM WHEN THE SUPPLY VOLTAGE 1S A MAXIMUM (V4 MAX.)3 WHEN THE LOAD CURRENT 15 A MINIMUM (I, MIN.) 3 AND WHEN THE TUBE VOLTAGE DROP 15 A MINIMUM (V. MIN.). THEREFORE THE CONDITIONS WHICH DETERMINE THE LOMER LIMIT FORTHE SERIES RESISTANCE Ry ARE THAT Ry > SAMAR. = V2 MIN, Tr Max. + Ty WIN INA LIKE MANNER IT CAN BE SHOWN THAT THE VALUE OF Ry INORDER TO LIMIT THE CURRENT TO THE MINIMUM VALUE REQUIRES THAT V4 MIN, — v2 MAX. ap < YAMIN, — v2 WAX. 2° Twine 2 wax WHEN THESE VALUES HAVE BEEN COMPUTED, ONE SHOULD CHECK TO SEE IF THERE
18 SUFFICIENT STARTING VOLTAGE BY THE FOLLOWING RELATION
Vg MIN < v sraRTiNG tA, Ry 1 i H % i re) O FIGURE 1 Towecsou ELECTAIE «Ne. ELECTAON TURE DIVISTON BLOOMFIELD, MEW JERSEY, W.fvA) DECEMBER 1) 2958” PLATE 83307
6542 TENTATIVE DATA
+ + (3,) osu REGULATED VOL TAGE Voutage oF 300 VOLTS| SUPPLY e542 (approx. ) | REGULATED VOLTAGE OF 150 VOLTS (apPRox.) E = —o OPERATION OF REGULATOR TUBES IN SERIES FIGURE 2 SERIES RESISTOR + + TODC , VOLTAGE 65u2 REGULATED SUPPLY 6) VOLTAGE ys TYPICA CIRCUIT FOR VOLTAGE REGULATOR FIGURE 3
WHEN THESE CALCULATIONS WAVE BEEN MADE AND THERE 1S INSUFFICIENT START~ ING VOLTAGE, A NEW LOAD CURRENT OF LOWER VALUE MUST BE USED AND THE CALCULATIONS REPEATED. CIRCUITS WHICH HAVE A CAPACITOR IN SHUNT WITH THE 6542 SHOULD BE LIMITED IN VALUE TO O.4 wf, LARGER VALUES MIGHT CAUSE OSCILLATIONS. OPERATION OF THE 6542 1N PARALLEL 1S NOT RECOMMENDED UNLESS A RESISTANCE OF APPROXIMATELY 400 OHMS 1S USED IN SERIES WITH EACH 6542 TO EQUILIZE DIVISION OF CURRENT. HOWEVER, IT SHOULD BE NOTED THAT WHILE THIS ENABLES ONE TO HANDLE MORE LOAD CURRENT IT REDUCES THE REGULATION THAT CAN BE OBTAINED. If IT 18 DESIRED TO OBTAIN HIGHER REGULATING VOLTAGES, TUSES MAY BE OP ERATED IN SERIES AS INDICATED IN FIGURE 2. HOWEVER, CARE SHOULO BE TAKEW To SEE THAT SUFFICIENT SUPPLY VOLTAGE 1S AVAILABLE TO START BOTH TUBES. BATH x 450-0-450 ¥ y 6336 7 3 Q Y 47K 4 mfd. 1K i 5K 4mfd. ¥ | SV. @ 6A, 10 KI ‘ 22K F i Mi (\\ z H : 8 i x : 6.3 V. @ 6A. @ wag +01 , afd TYPICAL APPLICATION OF 6582 USED IN VOLTAGE REGULATED POWER SUPPLY FIGURE 4 Tore-BOL EUECTATE Tue) BCHETRON TORE DIVTSTON @LOGUPTEGDS NEW TERDEYT Ooo DCOTOSER Te THE PLATE ON
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