SPW3842S

SPW3842S Elektronische Bauelemente RoHS Compliant Product High Performance Current Mode Controlers Description The SPW3842S is high performance fixed frequency current mode controllers. This is specifically designed for Off-Line and DC TO DC converter applications offering the designer a cost-effective solution with min. external components. These integrated circuits feature a trimmed oscillator for precise duty cycle control. A temperature compensated reference, high gain Error amplifier, current sensing comparator, and a high current totem pole output ideally suited for driving a power MOSFET. Also included are protective features consisting of input and reference undervoltages lockouts each with hysteresis, cycle-by-cycle current limiting, proprammable output deadtime, and latch for single pulse metering. SOP-8 0.40 0.90 6.20 5.80 0.25 0.19 0.25 45 o 0.375 REF 3.80 4.00 0.35 0.49 1.27 Typ. 4.80 5.00 0.10 0.25 0 o 8 o 1.35 1.75 Dimensions in millimeters Features * Low Startup And Operating Current * Automatic Feed Forward Compensation 8 7 6 5 * High Current Totem Pole Output * Trimmed Oscillator For Precise Frequency Control * Oscillator Frequency Graranteed At 250kHz * Undervoltage Lockout With Hysteresis * Current Mode Operation To 500kHz * Internally Trimmed Reference With Undervoltage Lockout * Iatching PWM For Cycle-By-Cycle Current Limiting Date Code 3842 1 2 3 4 SOP-8L Function Pin1:C ompens ation Pin2:Voltage Feedback Pin3:C urr ent Sens e Pin4:RT/CT Pin5:Gr ound Pin6:Output Pin7:Vcc Pin8:Vr ef D escription This pin is the Err or Amplifier output and is made available for loop compens ation. ogr am to d b This is the inver ting input of the Err or Amplifier. It’s normally c onrnectedmethey p a i es CT o gdern Switching pow er supply output thr ough acrtoristor tdivir ou. d .Oper ation 500kHz A voltage pr oportional to inductor curr ent is connected to this input .The PW M uses this inf or mation to terminate the output s witch c onduction. The oscillator fr equenc y and maximum output duty c yc le ar e pr ogr amnts d p yo me b The oscillator frequency and maximum output duty cycle are programmedu t by connec ting r esistor RT to Vr ef and c apac itor CT tto gr ound .Oper ation 500kHz pacitor CT o ground. Operation 500kHz is possible. Thisspiis its eheecer ebc e d utontt olItcipr ovirdeanchargier gcound.t f or c apacitor CT Thi n h t r f omnine o c pu r . rcuit y s d pow ng r urr en This output directly drives the gate off a power rMOSFET. .Peakkcurrentss up to This output dir ectly drives the gate o a powe MOSFET Pea curr ent up to 1 A ar e s ourc ed and sunk by this pin. This pin is the positive supply of the c ontr ol IC. This is the referencee output .provides es chargicurrent ent capacitor citor CT This is the r ef er enc output. It It pr ovid charging ng curr for f or c apa CT thr ough r esistor RT. http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 1 of 10 SPW3842S Elektronische Bauelemente High Performance Current Mode Controlers Absolute Maximum Ratings at Ta = 25: : Parameter Total power Supply and Zener current Output current,source or sink(note1) Output energy(capacitive load per cycle) Current sense and voltage feedback inputs Error Amplifier Output Sink Current Power Dissipation at Thermal characteristics Storage Temperature Range Operating Junction Temperature Operating ambient Temperature Symbol (ICC+Iz) Io W Vin Io PD P JA Tstg TJ TA VALUE 30 1.0 5.0 -0.3 to 5.5 10 702 178 -65 to 150 +150 0~+70 Unit mA A J V mA mW :/W : : : Electrical Characteristics Parameter Refer ence Section Output Voltage Line R egulation Load R egulation Temper atur e. Stability Total O utput Variation Output N ois e Voltage Long Ter m Stability Output Short C ircuit curr ent Oscillat or S ect ion Fr equenc y (0 : TA 70 : ,Vcc=15V[note 2],RT=10k,CT =3.3Nf,unless other wis e specified) SYM BOL VREF R egline R egload Ts VREF Vn S ISC Tj=25 : TA=0 : to 70 : Tj=25 : (RT =6.2k,CT =1.0nF) Line, Load, Temper atur e F=10kHz to 10Hz,Tj=25 : TA=125 : ,1000Hrs 4.82 -30 49 48 225 250 0.2 0.5 1.6 Tj=25 : TA = 0 : to 70 : Vo =2.5V VFB=5.0V Vo=2V to 4V Tj=25 : Vcc=12V to 25V Vo=1.1V,VF B=2.7V Vo=5.0V,VF B=2.3V VFB=2.3V,RL =15K to GND VFB=2.7V,RL =15K to Vr ef 65 0.7 60 2.0 -0.5 5.0 7.8 7.6 2.42 8.3 8.8 8.8 2.58 -2.0 Test Conditions Tj=25 : ,Io=1mA Vcc=12V to 25V Io=1mA to 20mA M in 4.90 Typ. 5 2.0 3.0 0.2 50 5 -85 52 M ax. 5.1 20 25 5.18 -180 55 56 275 1.0 % % V mA KHz Unit V mV mV mV/ : V V mV mA Fr equenc y Change with Voltage Fr equenc y Change with Temper atur e Oscillator Voltage S wing(P eak to P eak) Discharge C urr ent Error Amplifier S ection Voltage Feedback Input Input Bias Curr ent Open Loop Voltage G ain Unity G ain B andwidth P ower Supply R ejection R atio Output Sink C urr ent Output S ourc e C urr ent Output Voltage S wing H igh State Output Voltage S wing Low State fosc/ V fosc/ T VOSC Idischg Vcc=12V to 25V TA = 0 : to 70 : VFB IIB AVOL BW PSRR Isink Isourc e VoH VOL 2.50 -0.1 90 1.0 70 12 -1.0 6.2 0.8 V A dB MHz dB mA mA V 1.1 V http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 2 of 10 SPW3842S Elektronische Bauelemente High Performance Current Mode Controlers Current Sense section Curr ent S ens e Input Voltage gain Av (N ote 3,4) (N ote 3) VCC= 12 to 25V (N ote 3) Curr ent S ens e Input to Output Isink=20mA Isink=200mA Isourc e=20mA Isourc e=200mA VOL (UVLO) tr 2.85 0.9 3.0 1.0 70 -2 150 0.1 1.6 3.15 1.1 -10 300 0.4 2.2 V/V V dB A ns V V V V Maximum Curr ent S ens e Input Thr eshold Vth PSRR P ower Supply R ejection R atio IIB Input Bias Curr ent Tplh(in/out) Pr opagation D elay VOL Output Low Voltage Output H igh Level Output Voltage with UV LO Activated Output Voltage R is e Time Output Voltage Fall Time Under-Voltage Lockout Section Startup Thr es hold Min. O per ating Voltage After Turn- on(VCC) PWM Section Maximum Duty C ycle Minimum D uty C ycle Total Device Power Startup Supply Curr ent Power Oper ating Supply Curr ent Power Supply Zener Voltage ICC+IC ICC+IC Vz D C (M A X ) DC(MIN) Vth VCC(m in) VOH 13 12 13.5 13.4 0.1 50 50 1.1 150 150 17.5 11.5 VCC=6.0V,Isink=1.0mA Tj=25 : ,CL=1nF Tj=25 : ,CL=1nF 14.5 8.5 94 V ns ns V V % tr 16 10 96 0 VCC=14V N ote 2 ICC=25mA 30 0.3 12 36 0.5 17 % mA mA V N ote 1: Maximum Package power dissipation limits must be obs er ved. N ote 2: Adject Vcc above the Star tup thr eshold bef or e s etting to 15V. N ote 3: This par ameter is measur ed at the latch tr ip point with VFB=0V. N ote 4: C ompar ator gain is defined as:: AV V Output C ompens ation V Cur r ent Sens e Input Characteristics Curve ht tp://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 3 of 10 SPW3842S Elektronische Bauelemente High Performance Current Mode Controlers http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 4 of 10 SPW3842S Elektronische Bauelemente High Performance Current Mode Controlers http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 5 of 10 SPW3842S Elektronische Bauelemente High Performance Current Mode Controlers Application Information ht tp://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 6 of 10 SPW3842S Elektronische Bauelemente High Performance Current Mode Controlers http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 7 of 10 SPW3842S Elektronische Bauelemente High Performance Current Mode Controlers http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 8 of 10 SPW3842S High Performance Current Mode Elektronische Bauelemente Controlers http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 9 of 10 SPW3842S Elektronische Bauelemente High Performance Current Mode Controlers http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 10 of 10