KA3882/3/4/5 CURRENT MODE PWM CONTROLLER The KA3882/3/4/5 are fixed PWM controller for Off-Line and DC to DC converter applications. The internal circuits include UVLO, low start up current circuit, temperature compensated reference, high gain error amplifier, current sensing comparator, and high current totempole output for driving a POWER MOSFET. Also KA 3882/3/4/5 provide low start up current below 0.3mA and _ short shutdown delay time typ. 100ns. The KA3882 and KA3884 have UVLO threshold of 1 6V(on) and 10V(off). The KA3883 and KA3885 are 8.4V(on) and 7.6V(off). The KA3882 and KA3883 can operate within 100% duty cycle. The KA3884 and KA3885 within 50% by using T Flip-Flop. FEATURES e Low Start Current 0.2mA (typ) Operating Range Up To 500KHz Cycle by Cycle Current Limiting SMPS CONTROLLER 8 DIP 8 SOP ORDERING INFORMATION e Under Voltage Lock Out With Hysteresis - - * Short Shutdown Delay Time: typ.100ns Device Package Operating Temperature High Current Totempole Output KA388X 8 DIP 0~+85C Output Swing Limiting: 22V KA388XD 8 SOP 0~+85C BLOCK DIAGRAM AZ, Vee 29V V 5V SET/ re Vis | RESET S)GND UVLO [ereeNad q BIAS LOGIC 7) PWR Vc 1/2 Vier PWM Error Amp C.8Comp. LATCH Vee R S)OUTPUT Ss) comp) T cs P P PWR GND Rr /Cy OSCILLATOR eS Rev. B FAIRCHILD er ce SEMICONDUCTOR 1999 Fairchild Semiconductor CorporationKA3882/3/4/5 ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Voltage Vee Current lo n 2, 3) Vv Sink Current Power Dissi Pp Analog Error Amp. ELECTRICAL CHARACTERISTICS Value 30 +1 - 0.3 to 6.3 10 1 (Veco = 15V, Rr= 10KQ2 , Cp =3.3nF, Ta =O0Cto + 85C, Unless otherwise specified) SMPS CONTROLLER Characteristic | Symbol | Test Conditions Min | Typ Max | Unit REFERENCE SECTION Output Voltage VRer Ty =25C, lo=1mA 4.9 5.0 5.1 Vv Line Regulation A Vrer Voc = 12V to 25V - 6 20 mV Load Regulation A Vrer lo = 1mA to 20mMA - 6 25 mV Output Short Circuit Isc Ta=25C - - 100 - 180 mA OSILLATOR SECTION Initial Accuracy Fosc Ty =25C 47 52 57 KHz Voltage Stability STyv Voc = 12V to 25V - 0.2 1 % Amplitude Vosc Vpina, Peak to Peak - 1.7 - Vv Discharge Current IbiscHa Ty = 25, Pin4 =2V 7.8 8.3 8.8 mA CURRENT SENSE SECTION Gain Gy (NOTE 2, 3) 2.85 3 3.15 VN Maximum Input Signal View Veint = SV(NOTE 2) 0.9 1.0 14 Vv PSRR psan_ | Veo= 12V to 25V - 70 - dB (NOTE 1, 2) Input Bias Current Ibias - - -2 -10 uA Delay to Output Tp Veing = OV to 2V (NOTE) - 100 200 ns ee FAIRCHILD ee SEMICONDUCTORKA3882/3/4/5 ELECTRICAL CHARACTERISTICS(Continued) (Vcc = 15V, Rt = 10K@ , Cp =3.3nF, Ta = 0 Cto + 85C, Unless otherwise specified) SMPS CONTROLLER Characteristic | Symbol | Test Conditions | Min | Typ | Max | Unit ERROR AMPLIFIER SECTION Input Voltage Vi Teint = 2.5V 2.42 2.50 2.58 Vv Input Bias Current Ibias - - -0.3 -2 uA Open Loop Gain Gvo Vo=2V to 4V 65 90 - dB (NOTE 1) Unity Gain Bandwidth GBW Ty= 25 0.7 1 - MHz (NOTE 1) PSRR psrr_ | Voc = 12V to 26v 60 70 - dB (NOTE 1) Output Sink Current Isink Vewe = 2.7V 2 6 - mA Vein =1.1V Output Source Current lsournce Vee = 2.3 -0.5 -0.8 - mA Vein =5.0V Output High Voltage Vou Vena = 2.3V 5 6 - Vv R1=15K2 toGND Output Low Voltage Voi Vee = 2.7 - 0.8 11 Vv R1=15K2 to Pin8 OUTPUT SECTION Isink =20mA - 0.1 0.4 Vv Output Low Level VoL link = 200mA 15 22 Vv O High L | Vv lsource = 20MA 13 13.5 - Vv utput 9 eve o lsounce = 200MA 12 13.5 - Vv Rise Time tr Ty = 250, Ct = 1nF - 40 100 ns (NOTE 1) Fall Time te Ta = 280, Ct = nF - 40 100 ns (NOTE 1) Output Voltage Swing Limit Votim Veco = 27V, C1 = 1nF - 22 - Vv UNDER VOLTAGE LOCKOUT SECTION Start Threshold Vu KA3882/4 15 16 17 Vv KA3883/5 78 8.4 9.0 Vv Min.Operating Voltage V KA3882/4 9 10 cn Vv TL ( After turn on ) KA3883/5 7.0 7.6 8.2 Vv ee FAIRCHILD ee SEMICONDUCTORKA3882/3/4/5 ELECTRICAL CHARACTERISTICS(Continued) (Veco = 15V, Rr = 10K2 , Cr =3.3nF, Ta = 0 Cto +85C, unless otherwise specified) SMPS CONTROLLER | Symbol | Characteristic Test Conditions Min | Typ | Max | Unit PWM SECTION KA3882/3 94 96 100 % Maximum Duty Cycle Dax KA3B84/5 7 78 50 % Minimum Duty Cycle Duin - - - 0 % TOTAL STANDBY CURRENT Start-Up Current Ist - - 0.2 0.4 mA Operating Supply Current lec Veine = Veins = OV - 11 17 mA Vec Zener Voltage Vz Ice = 25mMA - 29 - Vv * Adjust Vcc above the start threshold bifore setting at 15V NOTE 1. These parameters, although guaranteed, are not 100% tested in production. 2. Parameter measured at trip point of latch with V2 = OV. 3. Gain defined as: Gy =A VeiniA Veina(V PINs =Oto 0.8V) ee FAIRCHILD ee SEMICONDUCTORTRADEMARKS 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. ACEx ISOPLANAR UHC CoolFET MICROWIRE VCX CROSSVOLT POP E?CMOS PowerTrench FACT Qs FACT Quiet Series Quiet Series FAST SuperSOT-3 FASTr SuperSOT-6 GTO SuperSOT-8 HiSeC TinyLogic DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. 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PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Product Status Definition Advance Information Formative or This datasheet contains the design specifications for In Design product development. Specifications may change in any manner without notice. Preliminary First Production 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. No Identification Needed Full Production This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. 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.