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 area voltage reference, an error amplifier, a pulse width modulator, an oscillator, under-voltage lockout, soft start circuit, and output drivers in the chip. FEATURES 5V + 1% Reference Oscillator Sync Terminal Internal Soft Start Deadtime Control Under-Voltage Lockout BLOCK DIAGRAM 16-SOP-225A ORDERING INFORMATION Vrer ( 16} Veco (1s) ea(-) G+ Device Package Operating Temperature KA3525A 16 DIP 30 ~ +85 KA3525AD 16-SOP-225A 30 ~ +85 T L. VG BAND GAP REF SV UV.L.O. ER AMP EA (+) @ 4 OUTPUT A EA OUT ( 9 } bw LATCH COMB. Oo + s oR c @ (SOFT START) OUTPUT B ) + 5.5K 7 OSCILLATOR FIF SHUT BoWn(10)-AMe-4 Q P 43K 5.5K . DISCHARGE 7 (3) G YNG R, OSC OUTPUT es Rev. B FAIRCHILD Ce SEMICONDUCTOR 1999 Fairchild Semiconductor CorporationKA3525A SMPS CONTROLLER ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Value Unit Supply Voltage Vec 40 Vv Collector Supply Voltage Ve 40 Vv Output Current, Sink or Source lo 500 mA Reference Output Current IREF 50 mA Oscillator Charging Current IcHarosc) 5 mA Power Dissipation (Ta = 25C) Pp 1000 miw Operating Temperature Topr 0~+70 Cc Storage Temperature Tsta -65 ~ +150 Cc Lead Temperature (Soldering, 10 sec) TLEaD +300 Cc ELECTRICAL CHARACTERISTICS (Vcc = 20V, Ta =-35 to + 85'C, unless otherwise specified) Characteristic Symbol Test Conditions Min Typ Max Unit REFERENCE SECTION Reference Output Voltage VreF Ty=25C 5.0 51 5.2 Vv Line Regulation A Vrer Vcc = 8 to 35V 9 20 mV Load Regulation A Vrer lReF = 0 to 20MA 20 50 mV Short Circuit Output Current Isc Vrer = 0, Ty = 250 80 100 mA Total Output Variation (Note 1) A Vrer Line, Load and Temperature 4.95 5.25 Vv Temperature Stability (Note 1) STt 20 50 mV Long Term Stability (Note 1) ST Ty= 125, 1 KHrs 20 50 mV OSCILLATOR SECTION Initial Accuracy (Note 1, 2) ACCUR Ty= 25T +3 +6 % Frequency Change With Voltage A fA Voc Veco = 8 to 35V (Note 1, 2) t 0.8 2 % Maximum Frequency famax) Rr=2K2 , Ct = 470pF 400 430 KHz Minimum Frequency foi) Rr = 200K2 ,Cr=0.1p F 60 120 Hz Clock Amplitude (Note 1, 2) Vicik) 3 4 Vv Clock Width (Note 1, 2) twctk) Ty= 25T 0.3 0.6 1 us Sync Threshold VTHisyNe) 1.2 2 2.8 Vv Sync Input Current lusync) Sync = 3.5V 1.3 2.5 mA ee FAIRCHILD ee SEMICONDUCTORKA3525A SMPS CONTROLLER ELECTRICAL CHARACTERISTICS (Vcc = 20V, Ta =-35 to +85, unless otherwise specified) Characteristic Symbol Test Conditions Min Typ | Max | Unit ERROR AMPLIFIER SECTION (Vcm= 5.1V) Input Offset Voltage Vio 15 10 mV Input Bias Current lbais 1 10 HA Input Offset Current lo 0.1 1 HA Open Loop Voltage Gain Gvo Riz 10M2 60 80 dB Common Mode Rejection Ratio CMRR Vem= 1.5 to 5.2V 60 90 dB Power Supply Rejection Ratio PSRR Vec = 8 to 3.5V 50 60 dB PWM COMPARATOR SECTION Minimum Duty Cycle Dein) 0 % Maximum Duty Cycle Diwax) 45 49 % Input Threshold Voltage (Note 2) Vout Zero Duty Cycle 0.7 0.9 Vv Input Threshold Voltage (NOte 2) Verne Max Duty Cycle 3.2 3.6 Vv SOFT-START SECTION Soft Start Current Isort Vsp = OV, Vss =O0V 25 51 80 i A Soft Start Low Level Voltage Vet Vsp = 25V 0.3 0.7 Vv Shutdown Threshold Voltage Vtnisp) 0.7 1.3 17 Vv Shutdown Input Current Insp) Vsp = 2.5V 0.3 1 mA OUTPUT SECTION Low Output Voltage | Vou! Isinxk = 20MA 0.1 0.4 Vv Low Output Voltage II Vow Isink = 100MA 0.05 2 Vv High Output Voltage I Vou IsouRCE =20mA 18 19 Vv High Output Voltage ll Vou I IsouRCE = 100mA 17 18 Vv Under Voltage Lockout Vuv Ve and V9 = High 6 7 8 Vv Collector Leakage Current Ika Vec = 35V 80 200 LA Rise Time (Note 1) tr CL=1u F, Ty=26C 80 600 ns Fall Time (Note 1) tr CL=1n F,Ty=25C 70 300 ns STANDBY CURRENT Supply Cuttent lec Vec = 35V | | 12 | 20 | mA (Note) 1. These parameters. although guaranteed over the recommended operating conditions, are not 100% tested in production 2. Tested at fosc=40 KHz (Rr =3.6K, Cr =0.01 F, Ri = 02 ) ee FAIRCHILD Pd SEMICONDUCTORKA3525A SMPS CONTROLLER TEST CIRCUIT BAND GAP REF 5V ee FAIRCHILD Pd 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. 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