Fairchild RC4194 User's Manual
Contents
1. VA Vs Case Vg VouT 1 14 Vs NC 2 13 NC T ANS Comp 3 12 GND OGO M Comp 7 3 agr al 14 11 RSET i S5 e E Comp 5 10 Ro NC 6 9 NC Comp agr Vs 7 8 VouT 65 4194 02 65 4194 03 Absolute Maximum Ratings beyond which the device may be damaged Parameter Min Typ Max Units Supply Voltage RC4194 35 V RM4194 45 V Supply Input to Output Voltage Differential RC4194 35 V RM4194 45 V Load Current PDIP 100 mA CerDIP 150 mA TO 66 Metal Can 250 mA PDTA lt 50 C PDIP 468 mW CerDIP 1042 mW TO 66 Metal Can 2381 mW Operating Temperature Tj RC4194 0 70 C RM4194 55 125 C Storage Temperature 65 150 C Junction Temperature PDIP 125 C CerDIP 175 C TO 66 Metal Can 150 C Lead Soldering Temperature 60 seconds 300 C For TA gt 50 C Derate at TO 66 Metal Can 23 81 mW C PDIP 6 25 mW C CerDIP 8 38 mW C Note 1 Functional operation under any of these conditions is NOT implied RC4194 PRODUCT SPECIFICATION Operating Conditions Notes AM 1 Measured as V SUL OUT x 100 8 I mA 2 Output voltage temperature drift guaranteed by design 3 The current drain will increase by 50uA VOUT on positive side and 1004 A VOUT on negative side 4 The specifications above apply for the given junctio2. 6104 6105 6117 Dual In line Package 20 Thermalloy 6007 30 Thermalloy 6010 32 Thermalloy 6011 34 Thermalloy 6012 45 IERC LI 60 Wakefield 650 651 Thermalloy P O Box 34829 2021 W Valley View Ln Dallas TX Wakefield Engin Ind Wakefield MA 01880 All values are typical as given by manufacturer or as determined from characteristic curves supplied by manufacturer 10 PRODUCT SPECIFICATION RC4194 Simplified Schematic Diagram dwo9 aseg ol Oy LaSy 9610 9 6 SA 20 9 eDexoed y 10J e1e sjequunu uld 8910N o o O gt 089 0591 S 006 ort 6000 Oly uu 000s 0008 zu Sly viu zd u vO 810 y gd 6002 ezo 80 90 ZO ES E 28 l bd jd 01 920 2o Lo x go 1 d LLO LO pu MSc 00S y SH vH O vO cdd eg g S Lyd dwo9 9820 11 PRODUCT SPECIFICATION RC4194 Mechanical Dimensions 9 Lead Metal Can IC Header Package D epi a A i Y ob lt S 1 a f T N L t ri q gt p Millimeters Symbol Notes Min Max 250 340 b D D1 Notes 1 All leads increase maximum limit by 003 08mm when lead finish is applied 12 RC4194 PRODUCT SPECIFICATION Mechanical Dimensions
3. A 40 x 3 25 x 10 11 75 C W Given 0J C 7 15 C W for the 4194 in the K package 0C S OS A 11 75 C W 7 15 C W 4 6 C W When using heatsink compound with a metal to metal interface a typical 0C S 0 5 C W for the K package The remaining 0S A of approximately 4 C W is a large enough thermal resistance to be easily provided by a number of heatsinks currently available Table 1 is a brief selection guide to heatsink manufacturers Table 1 Commercial Heatsink Selection Guide No attempt has been made to provide a complete list of all heatsink manufacturers This list is only representative Staver Co Inc 41 51 N Saxon Ave Bay Shore NY 11706 IERC 135 W Magnolia Blvd Burbank CA 91502 0s A C W Manufacturer Series or Part Number TO 66 Package 0 31 1 0 Thermalloy 6441 6443 6450 6470 6560 6590 6660 6690 1 0 3 0 Wakefield 641 Thermalloy 6123 6135 6169 6306 6401 6403 6421 6423 6427 6442 6463 6500 3 0 5 0 Wakefield 621 623 Thermalloy 6606 6129 6141 6303 IERC HP Staver V3 3 2 5 0 7 0 Wakefield 690 Thermalloy 6002 6003 6004 6005 6052 6053 6054 6176 6301 IERC LB Staver V3 5 2 7 0 10 0 Wakefield 672 Thermalloy 6001 6016 6051 6105 6601 IERC LA uP Staver V1 3 V1 5 V3 3 V3 5 V3 7 10 0 25 0 Thermalloy 6 13 6014 6015 6103
4. FICATION RC4194 Switchable Power Supply The outputs of the RC4194 can be simultaneously switched on or off under logic control as shown in Figure 8 In the off state the outputs will be forced to a minimum voltage or about 20 mV rather than becoming open circuit The turn on time with the outputs programmed to 12V is approximately 200 uS This circuit works by forcing the RO pin to ground with an analog switch Refer to the RC4194 internal schematic diagram A refer ence voltage that regulates with respect to VS is generated at the RSET pin by the zener diode Q12 and the buffer cir cuit of Q11 and Q13 When the external 71 5k RSET resis tor is connected between the RSET pin and VS a precision current of 100 uA is generated which then flows into Q13 s collector Since Q13 s collector is tied to the RO pin the 100 uA current will develop a ground referenced voltage drop proportional to the value of RO which is then amplified by the internal error amplifier When the analog switch in Fig ure 8 turns on it effectively shorts out RO and causes OV to be applied to the error amplifier The output voltage in the off state will be approxi mately 20 mV If a higher value 50 to 100 mV is acceptable then the DG201 analog switch can be replaced with a low cost small signal transistor as shown in the alternate switch configuration VS O e Logic Quad SPST CMOS Analog Switch Ro 30K Compensa
5. ICATION If a small signal silicon diode is used it will clamp the nega tive output voltage at about 0 55V A Schottky barrier or germanium device would clamp the voltage at about 0 3V Another cure which will keep the negative output negative at all times is the 1 mQ resistor connected between the 15V output and the Comp terminal This resistor will then sup ply drive to the negative output transistor causing it to satu rate to 1V during the brownout Heatsinking Voltage Regulators are power devices which are used in a wide range of applications When operating these devices near their extremes of load current ambient temperature and input output differential consideration of package dissipation becomes important to avoid thermal shutdown at 175 C The RC4194 has this fea ture to prevent damage to the device It typically starts affecting load regulation approximately 2 C below 175 C To avoid shutdown some form of heatsinking should be used or one of the above operating conditions would need to be derated The following is the basic equation for junction temperature T T P58 4 Equation 1 where TJ junction temperature C TA ambient air temperature C Pp power dissipated by device W 0J A thermal resistance from junction to ambient air C W The power dissipated by the voltage regulator can be detailed as follows Pp Vin Vout x Io Vin x I Equation 2 where VIN input vo
6. TION RC4194 Typical Performance Characteristics 150 0 06 130 0 05 m 5 S o 110 gt 0 04 S 9 0 03 gt Vour 15V o 70 wr 0 02 2 3 amp 50 2 0 01 E E An SS E 30 s 0 a S 9 d n 10 o 0 01 0 100 1K 10K 100K 0 20 40 60 80 100 120 140 160 180 200 F Hz I mA Figure 1 Ripple Rejection vs Frequency Figure 2 Load Regulation vs Load Current e D T Q DV o gt v B A 65 0203 C 60 40 20 0 20 40 60 80 100 120 140 Output Voltage Tracking Vout o Tj CC A Tracking of Vou B T C for Positive Regulator C T C for Negative Regulator Figure 3 Output Voltage Tracking vs Temperature RC4194 PRODUCT SPECIFICATION Typical Applications Vour E To Additional Comparators 0 01 uF 4 7uF Comp IHIH Vg RM4194 Bal Typically 15 RC4805s Vs Rset Comp Gnd Ro Vout OUT ES iem O To itiona Comparators 4 7uF pl Ro k 2 5 Vour af Adjust Ro for Vour 5V 12 5 kQ 7 Rey Rp2 20 kQ See Schematic Rei ll Ra 65 0205 l Vout l Vo
7. continued 14 Lead Ceramic DIP Package Millimeters Symbol Notes Min Max 200 A b1 36 58 8 b2 1 14 2 c1 20 38 8 D 4 E 4 e 5 9 eA 7 L Q 3 si 6 a vai D gt 7 1 T T r T TT T7 NOTE 1 E LXI d LA DE DX Ii 8 14 s1 a 8 peel ducc su sa Notes 1 Index area a notch or a pin one identification mark shall be located adjacent to pin one The manufacturer s identification shall not be used as pin one identification mark The minimum limit for dimension b2 may be 023 58mm for leads number 1 7 8 and 14 only Dimension Q shall be measured from the seating plane to the base plane This dimension allows for off center lid meniscus and glass overrun The basic pin spacing is 100 2 54mm between centerlines Each pin centerline shall be located within 010 25mm of its exact longitudinal position relative to pins 1 and 14 Applies to all four corners leads number 1 7 8 and 14 eA shall be measured at the center of the lead bends or at the centerline of the leads when a is 90 All leads Increase maximum limit by 003 08mm measured at the center of the flat when lead finish applied Twelve spaces 13 PRODUCT SPECIFICATION RC4194 Mechanical Dimensions continued 14 Lead Plastic DIP Package Notes Not
8. ds solid grounds and be located as close to the 4194 as possi ble Refer to Figure 9 for recommended compensation cir cuitry Protection In systems using monolithic voltage regulators a number of conditions can exist which left uncorrected will destroy the regulator Fortunately regulators can easily be protected against these potentially destructive conditions Monolithic regulators can be destroyed by any reversal of input or output voltage polarity or if the input voltage drops below the out put voltage in magnitude These conditions can be caused by inductive loads at the inputs or outputs of the regulator Other problems are caused by heavy loads at the unregulated inputs to the regulator which might cause the input voltage to drop below the output voltage at turn off If any of the preceding problem conditions are present in your system it is recommended that you protect the regulator using diodes These diodes should be high speed types capable of handling large current surges Figure 10 shows all six of the possible protection diodes The diodes at the inputs and outputs pre vent voltages at those points from becoming reversed Diodes from outputs to inputs prevent the output voltage from exceeding the input voltage Chances are that the sys tem under consideration will not require all six diodes but if in doubt be sure to include them Brownout Protection The RC4194 is one of the most easily applied and trouble fre
9. e monolithic ICs available When used within the data sheet ratings package power dissipation maximum output current minimum and maximum input voltages it provides the most cost effective source of regulated 15V for power ing linear ICs i 0 001uF Z Comp Vs O Vs O VoUT VOUT 00u 4194 Vs O Vs Vour O VouT Ro Rset Comp 0 01 uF 65 4201 Note All Capacitors are Ceramic Disc Except Solid Tantalum Figure 9 RC4194 Recommended Compensation Sometimes occasions arise in which the RC4194 ratings must be exceeded One example is the brownout During a brownout line voltages may be reduced to as low as 75 VRMS causing the input voltage to the RC4194 to drop below the minimum dropout voltage When this happens the negative output voltage can go to positive The maximum amount of current available is approximately 5 mA In general this is not enough current to damage most ICs which the RC4194 might be supplying but it is a potentially destructive condition Fortunately it is easy to protect against As shown in the typical application circuit in Figure 11 a diode D can be connected to the negative output Com P Vor 4194 Vour Rser Comp 0 01uF Note All Capacitors are Ceramic Disc Except Solid Tantalum 65 4202 Figure 10 RC4194 Regulator Showing All Protective Diodes RC4194 PRODUCT SPECIF
10. es 1 Dimensioning and tolerancing per ANSI Y14 5M 1982 2 D and E1 do not include mold flashing Mold flash or protrusions shall not exceed 010 inch 0 25mm Millimeters 3 Terminal numbers are shown for reference only 4 C dimension does not include solder finish thickness 5 Symbol N is the maximum number of terminals N proveri 8 14 D1 gt j Fe A 4 ae J A1 J M yo 1 L B1 gt Le Bele 14 PRODUCT SPECIFICATION RC4194 Ordering Information Product Number Temperature Range Screening Package SMD Number RC4194N 0 to 70 C Commercial 14 pin Plastic DIP RC4194D 0 to 70 C Commercial 14 pin Ceramic DIP RC4194K 0 to 70 C Commercial 9 pin TO 66 RM4194D 55 C to 125 C Commercial 14 pin Ceramic DIP RM4194D 883B 55 C to 125 C Military 14 pin Ceramic DIP 7705401CA RM4194K 55 C to 125 C Commercial 9 pin TO 66 Note 1 883B suffix denotes MIL STD 883 Par 1 2 1 compliant device LIFE SUPPORT POLICY FAIRCHILD 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 FAIRCHILD SEMICONDUCTOR CORPORATION As used herein 1 Life supp
11. ltage VOUT regulated output voltage Io load current IQ quiescent current drain Let s look at an application where a user is trying to deter mine whether the RC4194 in a high temperature environ ment will need a heatsink Given TJ at thermal shutdown 150 C TA 125 C OJ A 41 6 C W K TO 66 pkg VIN 40V VOUT 30V IQ 1mA 75 uA VOUT x 30V 3 25 mA T T 0 A Ec Pe P gt 05A Vin Vour x lo Vin x Ig Solve for Io T T y 9 _4 Vin Your Vin x Ig Vin Your Io _ 150 C 125 C 40x 3 25 x 10 O 41 6 C W x 10V 10 60 mA 13 mA 47 mA If this supply current does not provide at least a 10 margin under worst case load conditions heatsinking should be employed If reliability is of prime importance the multiple regulator approach should be considered In Equation 1 0J A can be broken into the following compo nents 0J A 9J C OC S OS A where 0J C junction to case thermal resistance 0C S case to heatsink thermal resistance OS A heatsink to ambient thermal resistance The current drain will increase by 50uA VOUT on positive side and 100uA VOUT on negative side PRODUCT SPECIFICATION RC4194 In the above example let s say that the user s load current is 200 mA and he wants to calculate the combined 0c s and OS A he needs Given Io 200 mA T TA 0 A i Vin Your x Io Vin x Ig RI 50 C 125 C 10V x 200m
12. n temperatures since pulse test conditions are used Parameter Min Typ Max Units 0JC Thermal Resistance CerDIP 60 C W TO 66 Metal Can 7 C W 0JA Thermal Resistance PDIP 160 C W CerDIP 120 C W TO 66 Metal Can 42 C W Electrical Characteristics 5 lt VOUT s VMAX VIN lt 8V IL x1mA RM4194 55 C lt Tj lt 125 C RC4194 0 C lt Tj lt 70 C unless otherwise specified Parameters Test Conditions Min Typ Max Units Line Regulation AVS 0 1 VIN 0 04 0 1 9eVOUT Load Regulation 4194K IL 200 mA 0 002 0 004 VouTIIL 4194D IL lt 100 mA mA VS x VOUT 5 V Output Voltage Drift With Temperature Positive Output VOUT 5V 0 002 0 015 C Negative Output VOUT 5V 0 003 0 015 9e C Supply Current Positive Vs VMAX VOUT OV 0 8 42 5 mA IL OmA Supply Current Negative Vs VMAX VOUT OV 1 8 4 0 mA IL OmA Supply Voltage RM4194 9 5 45 V RC4194 9 5 35 V Output Voltage Scale Factor RSET 71 5 kQ Tj 25 C 2 38 2 5 2 62 kQ V Vs VMAX Output Voltage Range RM4194 RSET 71 5 kQ 0 05 42 V IL 25 mA RC4194 RSET 71 5 kQ 0 05 42 V IL 25 mA Output Voltage Tracking 0 4 2 0 Ripple Rejection F 120 Hz Tj 25 C 70 dB Input Output Voltage Differential IL 50 mA Tj 25 C 3 0 V Short Circuit Current Vs 30V Tj 25 C 300 mA Output Noise Voltage CL 4 7 uF VOUT 15V 250 uVRMS F 10 Hz to 100 kHz Internal Thermal Shutdown 175 C PRODUCT SPECIFICA
13. oe i akak FAIRCHILD DEEEESGSSSEPS SEMICONDUCTOR w www fairchildsemi com RC4194 Dual Tracking Voltage Regulators Features Simultaneously adjustable outputs with one resistor to 42V Load current 200 mA with 0 04 load regulation Description The RC RM4194 are dual polarity tracking regulators designed to provide balanced or unbalanced positive and negative output voltages at currents to 200 mA A single external resistor adjustment can be used to change both outputs between the limits of x50 mV and 42V These devices are designed for local on card regulation eliminating distribution problems associated with single point regulation To simplify application the regulators require a minimum number of external parts The device is available in three package types to accommo date various power requirements The K TO 66 power package can dissipate up to 3W at TA 25 C The D 14 pin dual in line will dissipate up to 1 W and the N 14 pin dual in line will dissipate up to 625 mW Internal thermal shutdown at TJ 175 C External balance for VOUT unbalancing 3W power dissipations Block Diagram Vour Vs GND Comp 100uA Current RSET Source Bal Thermal Ro Shutdown Comp Vour Vs 65 4194 01 Rev 1 0 0 PRODUCT SPECIFICATION RC4194 Pin Assignments
14. ort devices or systems are devices or systems 2 which a are intended for surgical implant into the body or b support or sustain life and c 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 of the user www fairchildsemi com A critical component in 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 5 20 98 0 0m 001 Stock DS30004194 1998 Fairchild Semiconductor Corporation
15. tion For most applications the following compensation technique is sufficient The positive regulator section of the RC4194 is compensated by a 0 001 uF ceramic disc capacitor from the Comp terminal to ground The negative regulator requires compensation at two points The first is the Comp pin which should have 0 001 uF to the VS pin or case A ceramic disc is ideal here The second compen sation point for the negative side is the VOUT terminal which ideally should be a 4 7 uF solid tantalum capacitor with enough reserve voltage capacity to avoid the momentary shorting and reforming which can occur with tantalum caps For sys tems where the cost of a solid tantalum capacitor cannot be justified it is usually sufficient to use an aluminum capacitor with a 0 03 uF ceramic disc in parallel to bypass high fre quencies In addition if the rectifier filter capacitors have poor high frequency characteristics like aluminum electro lytics or if any impedance is in series with the Vs and Vs terminals it is necessary to bypass these two points with 0 01 uF ceramic disc capacitors Just as with monolithic op amps some applications may not require these bypass caps but if in doubt be sure to include them 0 001 uF e O 12V T lt 47uF O 12V 4 7 uF 65 4083 Figure 8 12V Switchable Power Supply PRODUCT SPECIFICATION RC4194 All compensation and bypass caps should have short lea
16. ur Re Ra Ra ee when Vour gt Voutl Rp eewhen l Vgyr x I Vour For Vour 5 when Vour 5V Ra oo Rp oo Figure 4 Unbalanced Output Voltage Comparator Application 2N4905 or equiv Rsc AVAVA 0 1 uF O Vout Vs 479 60uF Vs 47Q O AN Vout 60uF 0 1 nF 2N2297 or equiv e bd E Load regulation 10 mV 2 5A R s 2N914 or equiv Ro k9 2 5 IVol 0 7 Rsc sc Optional usage Not as critical as Vo bypass capacitors Note Compensation and bypass capacitor connections should be close as posibe to the 4194 65 0206 Figure 5 High Output Application PRODUCT SPECIFICATION RC4194 Typical Applications continued Vour 15V e O To Additional Op Amps 4 7uF Typically 180 741s Rset Comp Vour 15V PO To Additional Op Amps 4 7uF pt 0 0014F 65 0204 Ro k9 2 5 V our Figure 6 Balanced Output Voltage Op Amp Application e O Vg 425V 0 01uF Voyr 4 loR1 0 001 Comp Vs O Vour 0 to 19 92V 16 13 lo 4 Bete Ro RC4194K Ref R1 2 49K Vour 0 to 19 92V Binary Inputs Adjust R2 for 19 92V at Vour with all 1s at binary inputs then optionally adjust R3 for 19 92V at Voyt a eos 65 1725 RC4194K Figure 7 Digitally Controlled Dual 200 mA Voltage Regulator RC4194 PRODUCT SPECI
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