www.fairchildsemi.com KA3882E/KA3883E SMPS Controller Features Description * * * * * * * The KA3882E/KA3883E are fixed PWM controller for OffLine 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 totem-pole output for driving a POWER MOSFET. Also KA3882E/ KA3883E provide low start up current below 0.3mA and short shutdown delay time typ. 100ns. The KA3882E has UVLO threshold of 16V(on) and 10V(off). The KA3883E is 8.4V(on) and 7.6V(off). The KA3882E and KA3883E can operate within 100% duty cycle. Low Start Current 0.2mA (typ) Operating Range Up To 500KHz Cycle by Cycle Current Limiting Under Voltage Lock Out With Hysteresis Short Shutdown Delay Time: typ.100ns High Current Totem-pole Output Output Swing Limiting: 22V 8-DIP 1 8-SOP 1 Internal Block Diagram 7 VCC 29V 5V VREF VREF 8 SET/ RESET 5 GND UVLO Internal Bias Good LOGIC 7 PWR VC 1/2VREF VFB 2 Error Amp + - C.S PWM Comp. LATCH 1/3 R 22V 1V 6 OUTPUT S COMP 1 5 PWR T C.S 3 RT/CT 4 GND OSCILLATOR Rev. 5.0 (c)2000 Fairchild Semiconductor international KA3882E/KA3883E Absolute Maximum Ratings Parameter Supply Voltage Symbol Value Unit VCC 30 V IO +1 A VI(ANA) - 0.3 to 6.3 V ISINK(EA) 10 mA PD 1 W Output Current Analog Inputs (pin 2, 3) Error Amp. Output Sink Current Power Dissipation Electrical Characteristics (VCC = 15V, RT = 10KW, CT = 3.3nF, TA = 0C to + 70C ,Unless otherwise specified) Parameter Symbol Conditions Min. Typ. Max. Unit REFERENCE SECTION Output Voltage VREF TJ = 25C, IO = 1mA 4.9 5.0 5.1 V Line Regulation RLine VCC = 12V to 25V - 6 20 mV RLOAD ISC IO = 1mA to 20mA Ta = 25C - Load Regulation Output Short Circuit 6 25 - 100 - 180 mV mA OSILLATOR SECTION Initial Accuracy FOSC TJ = 25C Voltage Stability Amplitude STV VOSC VCC = 12V to 25V VPIN4, Peak to Peak Discharge Current 47 52 57 kHz - 0.2 1.7 1 - % V IDISCHG TJ = 25C 7.8 8.3 8.8 mA GV VI(MAX) (NOTE 2, 3) VPIN1 = 5V(NOTE 2) 2.85 0.9 3 1.0 3.15 1.1 V/V V CURRENT SENSE SECTION Gain Maximum Input Signal PSRR PSRR VCC = 12V to 25V (NOTE 1, 2) - 70 - dB Input Bias Current IBIAS VSENSE=0V - -2 -10 uA VPIN3 = 0 V to 2V (NOTE1) - 100 200 ns Delay to Output TD Notes: 1. These parameters, although guaranteed, are not 100% tested in production. 2. Parameter measured at trip point of latch with VFB = 0V. V COMP 3. Gain defined as: G V = ------------------------- ;O V SENSE 0.8V V SENSE 2 KA3882E/KA3883E Electrical Characteristics (Continued) (VCC = 15V, RT = 10KW, CT = 3.3nF, TA = 0C to + 70C, Unless otherwise specified) Parameter Symbol Conditions Min. Typ. Max. Unit 2.42 2.50 2.58 V - -0.3 -2 uA ERROR AMPLIFIER SECTION Input Voltage Input Bias Current VI IBIAS VPIN1 = 2.5V VFB=0V Open Loop Gain GVO VO = 2V to 4V (NOTE 1) 65 90 - dB Unity Gain Bandwidth GBW TJ= 25C (NOTE 1) 0.7 1 - MHz PSRR PSRR VCC = 12V to 25V (NOTE 1) 60 70 - dB Output Sink Current ISINK VPIN2 = 2.7V VPIN1 = 1.1V 2 6 - mA ISOURCE VPIN2 = 2.3V VPIN1 = 5.0V -0.5 -0.8 - mA Output Source Current Output High Voltage VOH VPIN2 = 2.3V R1 = 15K to GND 5 6 - V Output Low Voltage VOL VPIN2 = 2.7V R1 = 15K to Vref - 0.7 1.1 V ISINK = 20mA - 0.1 0.4 V ISINK = 200mA - 1.5 2.2 V ISOURCE = 20mA 13 13.5 - V ISOURCE = 200mA 12 13.5 - V OUTPUT SECTION Output Low Level VOL Output High Level VOH Rise Time tR TJ = 25C, C1 = 1nF (NOTE 1) - 40 100 ns Fall Time tF TJ = 25C, C1 = 1nF (NOTE 1) - 40 100 ns VCC = 27V, C1 = 1nF - 22 - V KA3882E 15 16 17 V KA3883E 7.8 8.4 9.0 V KA3882E 9 10 11 V KA3883E 7.0 7.6 8.2 V KA3882E/KA3883E 94 96 100 % Output Voltage Swing Limit VOLIM UNDER VOLTAGE LOCKOUT SECTION Start Threshold Min. Operating Voltage ( After turn on ) VTH VTL PWM SECTION Maximum Duty Cycle DMAX Minimum Duty Cycle DMIN - - - 0 % Start-Up Current IST - - 0.2 0.4 mA Operating Supply Current ICC VPIN2 = VPIN3 = 0V - 11 17 mA VCC Zener Voltage VZ ICC = 25mA - 29 - V TOTAL STANDBY CURRENT * Adjust VCC above the start threshold before setting at 15V Notes : 1. These parameters, although guaranteed, are not 100% tested in production. 2. Parameter measured at trip point of latch with VFB = 0V. V COMP 3. Gain defined as: G V = ------------------------- ;O V SENSE 0.8V V SENSE 3 KA3882E/KA3883E Mechanical Dimensions Package Dimensions in millimeters 1.524 0.10 #5 2.54 0.100 5.08 MAX 0.200 7.62 0.300 3.40 0.20 0.134 0.008 +0.10 0.25 -0.05 +0.004 0~15 4 0.010 -0.002 3.30 0.30 0.130 0.012 0.33 0.013 MIN 0.060 0.004 #4 0.018 0.004 #8 9.60 MAX 0.378 #1 9.20 0.20 0.362 0.008 ( 6.40 0.20 0.252 0.008 0.46 0.10 0.79 ) 0.031 8-DIP KA3882E/KA3883E Mechanical Dimensions (Continued) Package Dimensions in millimeters 8-SOP MIN #5 6.00 0.30 0.236 0.012 8 0~ +0.10 0.15 -0.05 +0.004 0.006 -0.002 MAX0.10 MAX0.004 1.80 MAX 0.071 3.95 0.20 0.156 0.008 5.72 0.225 0.41 0.10 0.016 0.004 #4 1.27 0.050 #8 5.13 MAX 0.202 #1 4.92 0.20 0.194 0.008 ( 0.56 ) 0.022 1.55 0.20 0.061 0.008 0.1~0.25 0.004~0.001 0.50 0.20 0.020 0.008 5 KA3882E/KA3883E Ordering Information 6 Product Number Package KA3882E 8-DIP KA3882ED 8-SOP KA3883E 8-DIP KA3883ED 8-SOP Operating Temperature 0 ~ + 70C KA3882E/KA3883E 7 KA3882E/KA3883E 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. 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 INTERNATIONAL. As used herein: 1. Life support devices or systems are devices or systems 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. 2. 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. www.fairchildsemi.com 9/25/00 0.0m 001 Stock#DSxxxxxxxx " 2000 Fairchild Semiconductor International