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| SL494 PWM Control Circuit The SL494 incorporates on a single monolithic chip all the functions required in the construction of a pulse-width-modulation control circuit. Designed primarily for power supply control, the SL494 contains an on-chip 5-volt regulator, two error amplifiers, adjustable oscillator, dead-time control comparator, pulse-steering flip-flop, and output-control circuitry. The uncommitted output transistors provide either common-emitter or emitter-follower output capability. Push-pull or single-ended output operation may be selected through the outputcontrol function. The architecture of the IL494 prohibits the possibility of either output being pulsed twice during push-pull operation. * * * * * * Complete PWM Power Control Circuitry Uncommitted Outputs for 200 mA Sink or Source Output Control Selects Single-Ended or Push-Pull Operation Internal Circuitry Prohibits Double Pulse at Either Output Internal Regulator Provides a Stable 5 V Reference Supply Variable Dead-Time Provides Control Over Total Range ORDERING INFORMATION SL494N Plastic SL494D SOIC TA = -20C to 85 C for all packages PIN ASSIGNMENT FUNCTION TABLE Output Control Grounded At Vref Output Function Single-ended or Parallel Output Normal Push-Pull Operation LOGIC DIAGRAM SLS System Logic Semiconductor SL494 MAXIMUM RATINGS Symbol VCC VI VO Supply Voltage Amplifier Input Voltage Collector Output Voltage Collector Output Current Tstg Storage Temperature Parameter Value 41 VCC +0.3 41 250 -65 to +150 Unit V V V mA C RECOMMENDED OPERATING CONDITIONS Symbol VCC VI VO Supply Voltage Amplifier Input Voltage Collector Output Voltage Collector Output Current (Each Transistor) Current Into Feed back Terminal CT RT Timing Capacitor Timing Resistor Oscillator Frequency TA Operating Free-Air Temperature 0.47 1.8 1 -20 Parameter Min 7 -0.3 Max 40 VCC - 2 40 200 0.3 10.000 500 300 +85 Unit V V V mA mA nF K KHz C SLS System Logic Semiconductor SL494 ELECTRICAL CHARACTERISTICS (Temperature -20 85C, VCC = 15 V, f=10 kHz)) Symbol Reference Section Vref Vregin Vregout Vref ISC Output Voltage Output regulation Input regulation Output Voltage change with temperature Short-circuit output current (Note 1) IO=1 mA VCC=7 V to 40 V, TA=25C IO=1 to 10 mA, TA=25C TA= -20C to 85C Vref=0 4.75 5.25 25 15 1 50 V mV mV % mA Parameter Test Conditions Min Max Unit Oscillator Section fOSC fOSC fOSC(V) fOSC(T) Frequency Standard deviation of frequency (Note 2) Frequency change with voltage Frequency change with temperature CT=0.01 F, RT=12 k All values of VCC, CT, RT, TA Constant VCC= 7 V to 40 V, TA=25C CT=0.01 F, RT=12 k TA= -20C to 85C 6 14 15 10 2 KHz % % % Dead Time Control Section IIB(2T) DCmax VTHD Input bias current (pin 4) Maximum duty cycle, each output Input threshold voltage (pin 4) Error Amp Section VIO IIO IIB Input offset voltage Input offset current Input bias current Common-mode input voltage range A vol fb CMRR IO IO+ Open-loop voltage amplification Unity-gain bandwidth Common-mode rejection ratio Output sink current (pin 3) Output source current (pin 3) VCC=40 V, TA=25C VID=-15 mV to -5 V, VO(pin 3)=0.7 V VID=15 mV to 5 V, VO(pin 3)=3.5 V VO(pin 3)=2.5 V VO(pin 3)=2.5 V VO(pin 3)=2.5 V VCC= 7 V to 40 V LOW HIGH VO=3 V, VO=0.5 to 3.5 V -0.3 VCC - 2 70 100 65 0.3 -2 dB kHz dB mA mA 10 250 1 mV nA A V VI= 0 to 5.25 V VI(pin 4)=0 V Zero duty cycle Maximum duty cycle 0 45 3.3 -10 A % V SLS System Logic Semiconductor SL494 ELECTRICAL CHARACTERISTICS(Temperature -20 85C, VCC = 15 V, f=10 kHz)) Symbol Parameter Test Conditions Min Max Unit PWM Comparator Section VTHP II Input threshold voltage (pin 3) Input sink current (pin 3) Zero duty cycle VO(pin 3)=0.7 V 0.3 4.5 V mA Switching Characteristics trc tfc trf tff Output voltage rise time Output voltage fall time Output voltage rise time Output voltage fall time Common-emitter configuration Common-emitter configuration Emitter-follower configuration Emitter-follower configuration 200 100 200 100 ns ns ns ns A A V Output Section IC(off) IE(off) VSAT Collector off-state current Emitter off-state current Collectoremitter saturation voltage IOCH Commonemitter Emitterfollower VCE=40 V, VCC=40 V VCC=VC=40 V, VE=0 VE=0, IC=200 mA VC=15 V, IE=-200 mA VI=Vref 100 -100 1.3 2.5 3.5 mA Output control input current Total Device ICC Standby supply current All other inputs & outputs open ICCA Average supply current V(pin 4)=2 V VCC=15 V VCC=40 V 10 15 17 mA mA Notes: 1. Duration of the short circuit should not exceed one second. 2. Standard deviation is a measure of the statistical disribution about the mean as derived from the formula N (x - x) n 2 n=1 = N-1 SLS System Logic Semiconductor |
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