KA3525A SMPS CONTROLLER VOLTAGE-MODE PWM CONTROLLER The KA3525A is a monolithic integrated circuit that Included all of the control circuit necessary for a pulse width modulating regulator. There are a voltage reference, an error amplifier, a pulse width modulator, an oscillator, under-voltage lockout, soft start circuit, and output drivers in the chip. 16-DIP 16-SOP-225A FEATURES * * * * * a 5V 1% Reference Oscillator Sync Terminal Internal Soft Start Deadtime Control Under-Voltage Lockout ORDERING INFORMATION Device KA3525A KA3525AD BLOCK DIAGRAM Package Operating Temperature I I 16 DIP -30 ~ +85 16-SOP-225A -30 ~ +85 5.5K 43K 5.5K Rev. B (c)1999 Fairchild Semiconductor Corporation KA3525A SMPS CONTROLLER ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Value Unit Supply Voltage VCC 40 V Collector Supply Voltage VC 40 V Output Current, Sink or Source IO 500 mA IREF 50 mA ICHG(OSC) 5 mA m/W Reference Output Current Oscillator Charging Current I) PD 1000 Operating Temperature T OPR 0 ~ +70 Storage Temperature T STG -65 ~ +150 Lead Temperature (Soldering, 10 sec) T LEAD +300 Power Dissipation (T A = 25 I I I ELECTRICAL CHARACTERISTICS I to + 85I, unless otherwise specified) (VCC = 20V, T A = -35 Characteristic Symbol Test Conditions REFERENCE SECTION Reference Output Voltage Line Regulation Load Regulation Short Circuit Output Current Total Output Variation (Note 1) I VREF T J = 25 LV LV REF ST Frequency Change With Voltage Maximum Frequency Line, Load and Temperature I, 1 KH T J = 125 CC f(MAX) f(MIN) Clock Amplitude (Note 1, 2) V(CLK) Clock Width (Note 1, 2) tW(CLK) Sync Input Current 5.2 V 9 20 mV I VCC = 8 to 35V (Note 1, 2) , C = 470pF = 200K, C = 0.1sF RT = 2K RT T 400 I T J = 25 50 mV 100 mA 5.25 V 20 50 mV 20 50 mV a3 a0.8 a6 a2 430 % % KHz 120 Hz 0.6 1 ss 2 2.8 V 1.3 2.5 mA 3 4 0.3 1.2 Sync = 3.5V 20 60 T VTH(SYNC) II(SYNC) RS Unit 80 4.95 T J = 25 ACCUR Lf/LV Minimum Frequency Sync Threshold 5.1 I OSCILLATOR SECTION Initial Accuracy (Note 1, 2) 5.0 VREF = 0, T J = 25 LV Long Term Stability (Note 1) Max IREF = 0 to 20mA REF ISC ST T Typ VCC = 8 to 35V REF Temperature Stability (Note 1) Min V KA3525A SMPS CONTROLLER ELECTRICAL CHARACTERISTICS I to +85I, unless otherwise specified) (VCC = 20V, T A = -35 Characteristic Symbol Test Conditions Min Typ Max Unit sA sA ERROR AMPLIFIER SECTION (VCM = 5.1V) Input Offset Voltage VIO 1.5 10 Input Bias Current IBAIS 1 10 0.1 1 Input Offset Current Open Loop Voltage Gain IIO GVO RL (10M mV 60 80 dB Common Mode Rejection Ratio CMRR VCM = 1.5 to 5.2V 60 90 dB Power Supply Rejection Ratio PSRR VCC = 8 to 3.5V 50 60 dB 45 49 0.7 0.9 PWM COMPARATOR SECTION Minimum Duty Cycle D(MIN) Maximum Duty Cycle D(MAX) 0 Input Threshold Voltage (Note 2) VTH1 Zero Duty Cycle Input Threshold Voltage (N0te 2) VTH2 Max Duty Cycle Soft Start Current ISOFT VSD = 0V, VSS = 0V Soft Start Low Level Voltage VSL VSD = 25V Shutdown Threshold Voltage VTH(SD) 3.2 % V 3.6 V sA SOFT-START SECTION Shutdown Input Current 25 0.7 IN(SD) VSD = 2.5V % 51 80 0.3 0.7 V 1.3 1.7 V 0.3 1 mA V OUTPUT SECTION Low Output Voltage I VOL I ISINK = 20mA 0.1 0.4 Low Output Voltage II VOL II ISINK = 100mA 0.05 2 High Output Voltage I VCH I ISOURCE = 20mA 18 19 High Output Voltage II VCH II ISOURCE = 100mA 17 18 Under Voltage Lockout VUV V8 and V9 = High 6 7 Collector Leakage Current ILKG V V V 8 V 80 200 sA Rise Time (Note 1) tR CL = 1 J 80 600 nS Fall Time (Note 1) tF CL J 70 300 nS 12 20 mA VCC = 35V sF, T = 26I = 1sF, T = 25I STANDBY CURRENT Supply Cuttent ICC VCC = 35V (Note) 1. These parameters. although guaranteed over the recommended operating conditions, are not 100% tested in production 2. Tested at fOSC=40 KHz (RT =3.6K, CT =0.01 F, RI = 0 ) s KA3525A TEST CIRCUIT 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 CoolFETTM CROSSVOLTTM E2CMOSTM FACTTM FACT Quiet SeriesTM FAST(R) FASTrTM GTOTM HiSeCTM ISOPLANARTM MICROWIRETM POPTM PowerTrenchTM QSTM Quiet SeriesTM SuperSOTTM-3 SuperSOTTM-6 SuperSOTTM-8 TinyLogicTM UHCTM VCXTM 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 In Design This datasheet contains the design specifications for 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.