KA7553A

KA7552A/KA7553A SMPS Controller Features Description • 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 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 + _ 0.56 ~ 0.42V CS CT RT 8 7 1 VCC 10uA 6 OSC + - 7V UVLO BIAS (4V) OFF 3.6V 2.8V 4.3K + - 2.4V 1.9V 0.24V FB ©2004 Semiconductor Components Industries, LLC. October-2017, Rev. 2 5 OUTPUT PWM R _ + 2 + - O.C.P Q S 3 4 IS(+) GND Publication Order Number: KA7553A/D KA7552A/KA7553A Absolute Maximum Ratings Parameter Symbol Value Unit VCC 30 V Supply voltage IO ±1.5 A Input voltage at overcurrent detection pin VIN(IS) -0.3 to 4 V Input voltage at FB pin VIN(FB) 4 V Input current at CS pin IIN(CS) 2 mA PD 800 mW Output current Total power dissipation (Ta = 25°C) Operating temperature TOPR -25 to 85 °C Storage temperature range TSTG -65 to 150 °C Tj +125 °C Junction temperature Electrical Characteristics (VCC = 18V, FOSC = 135kHz, TA = 25°C, unless otherwise specified) Parameter Symbol Conditions Min. Typ. Max. Unit Initial accuracy FOSC CT = 360pF, TJ = 25°C 125 135 145 kHz Frequency variation 1 ∆F/∆V VCC = 10V to 30V - ±1 ±3 % ∆F/∆V TA = 25°C to 85°C - ±1.5 - % OSCILLATOR SECTION Frequency variation 2(Note1) Ramp high voltage VRH CT = 360pF, TJ = 25°C 2.80 3.08 3.30 V Ramp low voltage VRL CT = 360pF, TJ = 25°C 0.6 0.9 1.2 V VPIN7, peak to peak 1.80 2.18 2.50 V Duty cycle = 0% 0.6 0.75 0.95 V VTH(FB1) (KA7552) Duty cycle = Dmax 1 2.1 2.3 2.6 V VTH(FB2) (KA7553) Duty cycle = Dmax 2 1.6 1.8 2.1 V Amplitude VOSC PULSE WIDTH MODULATION SECTION Input threshold voltage(pin2) Input threshold voltage(pin2)(Note1) Max. duty cycle Source current(pin2) VTH(FBD) D(Max1) (KA7552) - 66 70 74 % D(Max2) (KA7553) - 43 46 49 % ISOURCE(FB) VPIN2 = 0V -660 -800 -960 uA 0.21 0.27 V -300 -200 -100 uA OVERCURRENT LIMIT SECTION Input threshold voltage Source current(pin3) Deley time(Note1) - VTH(IS) ISOURCE(IS) VPIN3 = 0V TD - 0.24 - 150 - ns -15 -10 -5 uA 0.7 0.9 1.1 V SOFT START SECTION Charging current Input threshold voltage(pin8) Input threshold voltage(pin8)(Note1) ICHG VTH(CSO) VPIN8 = 0V - VTH(CS1) (KA7552) Duty cycle = Dmax 1 2.2 2.4 2.6 V VTH(CS2) (KA7553) Duty cycle = Dmax 2 1.7 1.9 2.1 V ISINK(CS) VPIN8 = 6V, VPIN2 = 1V 25 45 65 uA VTH(SD,CS) - 6.7 7.2 7.7 V VTH(SD,FB) - 2.6 2.8 3.1 V LATCH MODE SHUTDOWN CIRCUIT SECTION Sink current(pin8) Shutdown threshold voltage OVERLOAD SHUTDOWN SECTION Shutdown threshold voltage www.onsemi.com 2 KA7552A/KA7553A Electrical Characteristics (Continued) (VCC = 18V, FOSC = 135kHz, TA = 25°C, unless otherwise specified) Parameter Symbol Conditions Min. Typ. Max. Unit Start-up threshold voltage VTH(ST) - 15.5 16.0 16.5 V Minimum operating voltage VOPR(Min) - 8.20 8.70 9.20 V VHYS - 6.40 7.30 8.20 V VPIN8 = 0V -15 -10 -5 uA UNDER VOLTAGE LOCKOUT SECTION Hysteresis ON/OFF CONTROL SECTION Source current(pin8) ISOURCE(CS) On threshold voltage VTH(ON) VPIN8 : OFF->ON 0.45 0.56 0.70 V Off threshold voltage VTH(OFF) VPIN8 : ON -> OFF 0.30 0.42 0.55 V OUTPUT SECTION Low output voltage VOL IO = 100mA, VCC = 18V - 1.3 1.8 V High output voltage VOH IO = -100mA, VCC = 18V 16.0 16.5 18.0 V (Note1) TR No load - 50 - ns TF No load - 50 - ns Stand-by current ISB VCC = 14V - 90 150 uA Operating current ICC(OPR) VPIN2 = 0V - 9 15 mA Power supply current off ICC(OFF) VPIN8 = 0V - 1.1 1.8 mA Power supply current shutdown ICC(SD) VPIN8 = 7.6V - 1.1 1.8 mA Rise time Fall time(Note1) OVERALL Note : 1. These parameters, although guaranteed, are not 100% tested in production. 2. Recommend operating condition : - Vcc(min) = 12V - RT = 3.3kΩ ~ 10kΩ - Oscillation frequency = 5kHz ~ 600kHz - Soft start capacitor(CS) = 0.1uF ~ 1uF www.onsemi.com 3 KA7552A/KA7553A Mechanical Dimensions Package Dimensions in millimeters #5 1.524 ±0.10 0.060 ±0.004 #4 0.018 ±0.004 #8 2.54 0.100 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 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° 0.010 –0.002 www.onsemi.com 4 3.30 ±0.30 0.130 ±0.012 0.33 MIN 0.013 KA7552A/KA7553A Ordering Information Product Number KA7552A KA7553A Package Operating Temperature 8-DIP -25 ~ +85°C www.onsemi.com 5 ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. 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