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| KA3842AC/KA3842AE SMPS Controller March 2006 KA3842AC/KA3842AE SMPS Controller Features Low start current 0.2mA (Typ.) Operating range up to 500kHz Cycle by cycle current limiting Under Voltage Lock Out (UVLO) with hysteresis Short shutdown delay time: Typ.100ns High current totem-pole output Output swing limiting: 22V Description The KA3842AC/KA3842AE are fixed PWM controllers for Off Line and DC to DC converter applications. The internal circuits include UVLO, low start up current, temperature compensated reference, high gain error amplifier, current sensing comparator, and high current totem pole output for driving a POWER MOSFET. Also KA3842AC/KA3842AE provides low start up current below 0.3mA and short shutdown delay time, typically 100ns. The KA3842AC/KA3842AE has a UVLO threshold of 16V(on) and 10V(off). The KA3842AC/KA3842AE can operate within a 100% duty cycle. 1 8-DIP Ordering Information Part Number KA3842AC KA3842AE Operating Temp. Range -0 to +70C Pb-Free Yes Package 8-DIP Packing Method Tube (c)2006 Fairchild Semiconductor Corporation 1 www.fairchildsemi.com KA3842AC/KA3842AE Rev. 1.0.1 KA3842AC/KA3842AE SMPS Controller Internal Block Diagram 7 VCC 29V VREF 8 Internal Bias 1/2 VREF Error Amp + C.S PWM Comp. LATCH 1/3 1V S COMP 1 T 5 PWR GND R 22V 6 OUTPUT 5V VREF SET/ RESET UVLO Good LOGIC 7 PWR VC 5 GND VFB 2 C.S 3 RT/CT 4 OSCILLATOR KA3842AC/KA3842AE Rev. 1.0.1 2 www.fairchildsemi.com KA3842AC/KA3842AE SMPS Controller Absolute Maximum Ratings The "Absolute Maximum Ratings" are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The "Recommended Operating Conditions" table will define the conditions for actual device operation. Symbol VCC Parameter Supply Voltage Output Current Analog Inputs (Pins 2, 3) Error Amp. Output Sink Current Power Dissipation Thermal Resistance, Junction-to-Air (4) Value 30 1 -0.3 to 6.3 10 1 95 Unit V A V mA W C/W IO VI(ANA) ISINK(EA) PD Rja Electrical Characteristics (VCC = 15V, RT = 10k3/4, CT = 3.3nF, TA = 0C to +70C, unless otherwise specified) Symbol VREF VREF ISC FOSC STV VOSC IDISCHG GV VI(MAX) PSRR IBIAS TD VI IBIAS GVO GBW PSRR ISINK ISOURCE VOH VOL Parameter Output Voltage Line Regulation Load Regulation Output Short Circuit Initial Accuracy Voltage Stability Amplitude Discharge Current Gain(2)(3) Maximum Input PSRR(1)(2) Input Bias Current Delay to Output(1) Input Voltage Input Bias Current Open Loop Gain(1) Unity Gain Bandwidth PSRR(1) Output Sink Current Output Source Current Output High Voltage Output Low Voltage (1) Conditions TJ = 25C, IO = 1mA VCC = 12V to 25V IO = 1mA to 20mA TA = 25C TJ = 25C VCC = 12V to 25V VPIN4, Peak to Peak TJ = 25C, Pin 4 = 2V Min. 4.9 - - - 47 - - 7.8 2.85 Typ. 5.0 6 6 -100 52 0.2 1.7 8.3 3 1.0 70 -2 100 2.50 -0.3 90 1 70 6 -0.8 6 0.8 Max. 5.1 20 25 -180 57 1 - 8.8 3.15 1.1 - -10 200 2.58 -2 - - - - - - 1.1 Unit V mV mV mA kHz % V mA V/V V dB A ns V A dB MHz dB mA mA V V REFERENCE SECTION OSILLATOR SECTION CURRENT SENSE SECTION Signal(2) VPIN1 = 5V VCC = 12V to 25V VPIN3 = 0 V to 2V TPIN1 = 2.5V VO = 2V to 4V TJ = 25C VCC = 12V to 25V VPIN2 = 2.7V VPIN1 = 1.1V VPIN2 = 2.3V VPIN1 = 5.0V VPIN2 = 2.3V, R1 = 15k3/4 to GND VPIN2 = 2.7V R1 = 15k3/4 to Pin 8 3 0.9 - - - 2.42 - 65 0.7 60 2 -0.5 5 - ERROR AMPLIFIER SECTION KA3842AC/KA3842AE Rev. 1.0.1 www.fairchildsemi.com KA3842AC/KA3842AE SMPS Controller Electrical Characteristics (Continued) (VCC = 15V, RT = 10k3/4, CT = 3.3nF, TA = 0C to +70C, unless otherwise specified) Symbol OUTPUT SECTION VOL VOH tR tF VOLIM VTH VTL Parameter Output Low Level Output High Level Rise Time(1) Fall Time(1) Output Voltage Swing Limit Start Threshold Min. Operating Voltage (After turn on) Maximum Duty Cycle Minimum Duty Cycle Start-Up Current Operating Supply Current VCC Zener Voltage Conditions ISINK = 20mA ISINK = 200mA ISOURCE = 20mA ISOURCE = 200mA TJ = 25C, C1 = 1nF TJ = 25C, C1 = 1nF VCC = 27V, C1 = 1nF Min. - - 13 12 - - - 15 9 Typ. 0.1 1.5 13.5 13.5 40 40 22 16 10 Max. 0.4 2.2 - - 100 100 - 17 11 Unit V V V V ns ns V V V UNDER VOLTAGE LOCKOUT SECTION PWM SECTION DMAX DMIN IST ICC VZ 94 - - VPIN2 = VPIN3 = 0V ICC = 25mA - - 96 - 0.2 11 29 100 0 0.4 17 - % % mA mA V TOTAL STANDBY CURRENT * Adjust VCC above the start threshold before setting at 15V Notes: 1. 2. 3. 4. These parameters, although guaranteed, are not 100% tested in production. Parameter measured at trip point of latch with V2 = 0V. Gain defined as: GV = VPIN1VPIN3(VPIN3 = 0 to 0.8V) Junction-to-air thermal resistance test environments PCB information: Board thickness; 1.6mm, Board dimension: 76.2 X 114.3mm2, Ref.: EIA/JSED51-3 and EIA/JSED51-7 Board structure; Using the single layer PCB. KA3842AC/KA3842AE Rev. 1.0.1 4 www.fairchildsemi.com KA3842AC/KA3842AE SMPS Controller Package Dimensions 8-Pin DIP Dimensions in millimeters KA3842AC/KA3842AE Rev. 1.0.1 5 www.fairchildsemi.com KA3842AC/KA3842AE SMPS Controller TRADEMARKS The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks. ACExTM FAST(R) ActiveArrayTM FASTrTM BottomlessTM FPSTM Build it NowTM FRFETTM CoolFETTM GlobalOptoisolatorTM CROSSVOLTTM GTOTM DOMETM HiSeCTM EcoSPARKTM I2CTM E2CMOSTM i-LoTM EnSignaTM ImpliedDisconnectTM FACTTM IntelliMAXTM FACT Quiet SeriesTM Across the board. Around the world.TM The Power Franchise(R) Programmable Active DroopTM DISCLAIMER ISOPLANARTM LittleFETTM MICROCOUPLERTM MicroFETTM MicroPakTM MICROWIRETM MSXTM MSXProTM OCXTM OCXProTM OPTOLOGIC(R) OPTOPLANARTM PACMANTM POPTM Power247TM PowerEdgeTM PowerSaverTM PowerTrench(R) QFET(R) QSTM QT OptoelectronicsTM Quiet SeriesTM RapidConfigureTM RapidConnectTM SerDesTM ScalarPumpTM SILENT SWITCHER(R) SMART STARTTM SPMTM StealthTM SuperFETTM SuperSOTTM-3 SuperSOTTM-6 SuperSOTTM-8 SyncFETTM TCMTM TinyLogic(R) TINYOPTOTM TruTranslationTM UHCTM UltraFET(R) UniFETTM VCXTM WireTM FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TOANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOTASSUMEANY LIABILITY ARISING OUT OF THEAPPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEYANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILDiS PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTENAPPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component is any component of a life 1. Life support devices or systems are devices or support device or system whose failure to perform can systems which, (a) are intended for surgical implant into be reasonably expected to cause the failure of the life the body, or (b) support or sustain life, or (c) whose support device or system, or to affect its safety or failure to perform when properly used in accordance with instructions for use provided in the labeling, can be effectiveness. reasonably expected to result in significant injury to the user. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Advance Information Product Status Formative or In Design Definition This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. This datasheet contains preliminary data, and supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. Preliminary First Production No Identification Needed Full Production Obsolete Not In Production This datasheet contains specifications on a product that has been discontinued by Fairchild semiconductor. The datasheet is printed for reference information only. Rev. I18 KA3842AC/KA3842AE Rev. 1.0.1 6 www.fairchildsemi.com |
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