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| www.fairchildsemi.com KA7552A/KA7553A SMPS Controller Features * Built-in drive circuits for direct connection power MOSFET (lO = 1.5A) * Wide operating frequency range (5kHz ~ 600kHz) * Pulse by pulse over current limiting * Over load protection * On/off control by external trigger * Internal UVLO * Low standby current (typ. 90uA) * Soft start circuit Description The KA7552A/KA7553A are switching power control IC for wide operating frequency range. The internal circuits include pulse by pulse current limiting, protection, on/off control by external trigger, low standby current, soft start, and high current totempole output for driving a POWER MOSFET. Maximum duty of the KA7552A is 70% and the KA7553A is 46%. When duty is maximum, the input threshold voltage of pin2 & pin8 are not same in KA7552A and KA7553A. 8-DIP 1 Internal Block Diagram CS + _ + 0.56 ~ 0.42V CT 7 RT 1 10uA VCC 6 8 OSC 7V UVLO BIAS (4V) OFF 3.6V 2.8V 4.3K + - 2.4V 1.9V + - 5 PWM OUTPUT 0.24V R _ + O.C.P Q S 2 FB 3 IS(+) 4 GND Rev. 1.0.2 (c)2004 Fairchild Semiconductor Corporation KA7552A/KA7553A Absolute Maximum Ratings Parameter Supply voltage Output current Input voltage at overcurrent detection pin Input voltage at FB pin Input current at CS pin Total power dissipation (Ta = 25C) Operating temperature Storage temperature range Junction temperature Symbol VCC IO VIN(IS) VIN(FB) IIN(CS) PD TOPR TSTG Tj Value 30 1.5 -0.3 to 4 4 2 800 -25 to 85 -65 to 150 +125 Unit V A V V mA mW C C C Electrical Characteristics (VCC = 18V, FOSC = 135kHz, TA = 25C, unless otherwise specified) Parameter OSCILLATOR SECTION Initial accuracy Frequency variation 1 Frequency variation 2 Ramp high voltage Ramp low voltage Amplitude PULSE WIDTH MODULATION SECTION Input threshold voltage(pin2) Input threshold voltage(pin2)(Note1) Max. duty cycle Source current(pin2) OVERCURRENT LIMIT SECTION Input threshold voltage Source current(pin3) Deley time(Note1) SOFT START SECTION Charging current Input threshold voltage(pin8) Input threshold voltage(pin8)(Note1) ICHG VTH(CSO) VTH(CS1) (KA7552) VTH(CS2) (KA7553) ISINK(CS) VTH(SD,CS) VTH(SD,FB) VPIN8 = 0V Duty cycle = Dmax 1 Duty cycle = Dmax 2 VPIN8 = 6V, VPIN2 = 1V -15 0.7 2.2 1.7 25 6.7 2.6 -10 0.9 2.4 1.9 45 7.2 2.8 -5 1.1 2.6 2.1 65 7.7 3.1 uA V V V uA V V VTH(IS) ISOURCE(IS) TD VPIN3 = 0V 0.21 0.24 150 0.27 V uA ns -300 -200 -100 VTH(FBD) VTH(FB1) (KA7552) VTH(FB2) (KA7553) D(Max1) (KA7552) D(Max2) (KA7553) ISOURCE(FB) VPIN2 = 0V Duty cycle = 0% Duty cycle = Dmax 1 Duty cycle = Dmax 2 0.6 2.1 1.6 66 43 0.75 2.3 1.8 70 46 0.95 2.6 2.1 74 49 V V V % % uA (Note1) Symbol FOSC F/V F/V VRH VRL VOSC Conditions CT = 360pF, TJ = 25C VCC = 10V to 30V TA = 25C to 85C CT = 360pF, TJ = 25C CT = 360pF, TJ = 25C VPIN7, peak to peak Min. Typ. Max. Unit 125 2.80 0.6 1.80 135 1 1.5 3.08 0.9 2.18 145 3 3.30 1.2 2.50 kHz % % V V V -660 -800 -960 LATCH MODE SHUTDOWN CIRCUIT SECTION Sink current(pin8) Shutdown threshold voltage OVERLOAD SHUTDOWN SECTION Shutdown threshold voltage 2 KA7552A/KA7553A Electrical Characteristics (Continued) (VCC = 18V, FOSC = 135kHz, TA = 25C, unless otherwise specified) Parameter UNDER VOLTAGE LOCKOUT SECTION Start-up threshold voltage Minimum operating voltage Hysteresis ON/OFF CONTROL SECTION Source current(pin8) On threshold voltage Off threshold voltage OUTPUT SECTION Low output voltage High output voltage Rise time Fall time (Note1) (Note1) Symbol VTH(ST) VOPR(Min) VHYS ISOURCE(CS) VTH(ON) VTH(OFF) VOL VOH TR TF ISB ICC(OPR) ICC(OFF) ICC(SD) Conditions VPIN8 = 0V VPIN8 : OFF->ON VPIN8 : ON -> OFF IO = 100mA, VCC = 18V IO = -100mA, VCC = 18V No load No load VCC = 14V VPIN2 = 0V VPIN8 = 0V VPIN8 = 7.6V Min. 15.5 8.20 6.40 -15 0.45 0.30 16.0 - Typ. 16.0 8.70 7.30 -10 0.56 0.42 1.3 16.5 50 50 90 9 1.1 1.1 Max. 16.5 9.20 8.20 -5 0.70 0.55 1.8 18.0 150 15 1.8 1.8 Unit V V V uA V V V V ns ns uA mA mA mA OVERALL Stand-by current Operating current Power supply current off Power supply current shutdown Note : 1. These parameters, although guaranteed, are not 100% tested in production. 2. Recommend operating condition : - Vcc(min) = 12V - RT = 3.3k ~ 10k - Oscillation frequency = 5kHz ~ 600kHz - Soft start capacitor(CS) = 0.1uF ~ 1uF 3 KA7552A/KA7553A Mechanical Dimensions Package Dimensions in millimeters 8-DIP 0.018 0.004 1.524 0.10 0.060 0.004 0.46 0.10 6.40 0.20 0.252 0.008 #1 #8 9.20 0.20 0.362 0.008 9.60 MAX 0.378 #4 #5 2.54 0.100 ( 0.79 ) 0.031 5.08 MAX 0.200 7.62 0.300 3.40 0.20 0.134 0.008 3.30 0.30 0.130 0.012 0.33 MIN 0.013 0.25 -0.05 0~15 +0.10 0.010 -0.002 +0.004 4 KA7552A/KA7553A Ordering Information Product Number KA7552A KA7553A Package 8-DIP Operating Temperature -25 ~ +85C 5 KA7552A/KA7553A 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 CORPORATION. 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. www.fairchildsemi.com 6/25/04 0.0m 001 Stock#DSxxxxxxxx 2003 Fairchild Semiconductor Corporation 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. |
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