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| TECHNICAL DATA IL494 PWM Control Circuit The IL494 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 IL494 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 IL494N Plastic IL494D 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 1 IL494 MAXIMUM RATINGS Symbol VCC VI VO Tstg Supply Voltage Amplifier Input Voltage Collector Output Voltage Collector Output Current 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 TA Timing Capacitor Timing Resistor Oscillator Frequency 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 2 IL494 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) Frequency Standard deviation of frequency (Note 2) Frequency change with voltage Frequency change with temperature 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) 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 VI= 0 to 5.25 V VI(pin 4)=0 V Zero duty cycle Maximum duty cycle 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 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 65 0.3 -2 dB kHz dB mA mA 0 10 250 1 mV nA A V 45 3.3 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 Avol 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) -10 A % V 3 IL494 ELECTRICAL CHARACTERISTICS(Temperature -20 85C, VCC = 15 V, f=10 kHz)) Symbol VTHP II trc tfc trf tff IC(off) IE(off) VSAT Parameter Input threshold voltage (pin 3) Input sink current (pin 3) Output voltage rise time Output voltage fall time Output voltage rise time Output voltage fall time Collector off-state current Emitter off-state current Collectoremitter saturation voltage IOCH ICC ICCA Total Device Standby supply current Average supply current All other inputs & outputs open V(pin 4)=2 V VCC=15 V VCC=40 V 10 15 17 mA mA Commonemitter Emitterfollower Test Conditions Zero duty cycle VO(pin 3)=0.7 V Common-emitter configuration Common-emitter configuration Emitter-follower configuration Emitter-follower configuration 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 0.3 200 100 200 100 100 -100 1.3 2.5 3.5 mA Min Max 4.5 Unit V mA ns ns ns ns A A V PWM Comparator Section Switching Characteristics Output Section Output control input current 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 (xn - x)2 n=1 = N-1 4 |
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