TECHNICAL DATA PWM Control Circuit IL494A 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 5volt 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 emitterfollower output capability. Push-pull or single-ended output operation may be selected through the output-control function. The architecture of the IL494 prohibits the possibility of either output being pulsed twice during push-pull operation. FEATURE PIN ASSIGNMENT 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 Device IL494AN IL494AD IL494ADT Operating Temperature Range TA = -20 to 85 C for all packages Package Plastic DIP-16 SOP-16 SOP-16 Shipping Tube Tube Tape& Reel FUNCTION TABLE Output Control Grounded At Vref Output Function Single-ended or Parallel Output Normal Push-Pull Operation LOGIC DIAGRAM July 2009, Ver.01 IL494A MAXIMUM RATINGS Symbol VCC Parameter Supply Voltage Value Unit 41 V VI Amplifier Input Voltage VCC +0.3 V VO Collector Output Voltage 41 V Collector Output Current 250 mA -65 to +150 C Tstg Storage Temperature RECOMMENDED OPERATING CONDITIONS Symbol VCC Parameter Supply Voltage Min Max Unit 7 40 V -0.3 VCC - 2 V VI Amplifier Input Voltage VO Collector Output Voltage 40 V Collector Output Current (Each Transistor) 200 mA Current Into Feed back Terminal 0.3 mA CT Timing Capacitor 0.47 10.000 nF RT Timing Resistor 1.8 500 K 1 300 KHz -20 +85 C Oscillator Frequency TA Operating Free-Air Temperature July 2009, Ver.01 IL494A ELECTRICAL CHARACTERISTICS (Temperature -20 85C, VCC = 15 V, f=10 kHz)) Symbol Parameter Test Conditions Min Max Unit 4.95 5.05 V Reference Section Vref Output Voltage IO=1 mA Vregin Output regulation VCC=7 V to 40 V, TA=25C 25 mV Vregout Input regulation IO=1 to 10 mA, TA=25C 15 mV Vref Output Voltage change with temperature TA= -20C to 85C 1 % ISC Short-circuit output current (Note 1) Vref=0 50 mA 14 KHz Oscillator Section fOSC Frequency CT=0.01 F, RT=12 k fOSC Standard deviation of frequency (Note 2) All values of VCC, CT, RT, TA Constant 15 % fOSC(V) Frequency change with voltage VCC= 7 V to 40 V, TA=25C 10 % fOSC(T) Frequency change with temperature CT=0.01 F, RT=12 k TA= -20C to 85C 2 % -10 A 6 Dead Time Control Section IIB(2T) Input bias current (pin 4) VI= 0 to 5.25 V DCmax Maximum duty cycle, each output VI(pin 4)=0 V VTHD Input threshold voltage Zero duty cycle (pin 4) Maximum duty cycle 45 % 3.3 V 0 Error Amp Section VIO Input offset voltage VO(pin 3)=2.5 V 10 mV IIO Input offset current VO(pin 3)=2.5 V 250 nA IIB Input bias current VO(pin 3)=2.5 V 1 A Common-mode input VCC= 7 V to 40 V voltage range Avol fb CMRR Open-loop voltage amplification LOW -0.3 HIGH VCC - 2 VO=3 V, VO=0.5 to 3.5 V Unity-gain bandwidth V 70 dB 100 kHz Common-mode rejection ratio VCC=40 V, TA=25C 65 dB IO Output sink current (pin 3) VID=-15 mV to -5 V, VO(pin 3)=0.7 V 0.3 mA IO+ Output source current (pin 3) VID=15 mV to 5 V, VO(pin 3)=3.5 V -2 mA July 2009, Ver.01 IL494A ELECTRICAL CHARACTERISTICS (Temperature -20 85C, VCC = 15 V, f=10 kHz)) Symbol Parameter Test Conditions Min Max Unit 4.5 V PWM Comparator Section VTHP II Input threshold voltage (pin 3) Zero duty cycle Input sink current (pin 3) VO(pin 3)=0.7 V 0.3 mA Switching Characteristics trc Output voltage rise time Common-emitter configuration 200 ns tfc Output voltage fall time Common-emitter configuration 100 ns trf Output voltage rise time Emitter-follower configuration 200 ns tff Output voltage fall time Emitter-follower configuration 100 ns Output Section IC(off) Collector off-state current VCE=40 V, VCC=40 V 100 A IE(off) Emitter off-state current VCC=VC=40 V, VE=0 -100 A VSAT Collectoremitter Commonemitter VE=0, IC=200 mA 1.3 V saturation voltage Emitterfollower VC=15 V, IE=-200 mA 2.5 VI=Vref 3.5 mA mA IOCH Output control input current Total Device ICC ICCA Standby supply current Average supply current All other inputs & VCC=15 V 10 outputs open VCC=40 V 15 V(pin 4)=2 V 17 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 (xn - x)2 n=1 = N–1 July 2009, Ver.01 IL494A Typical Application Pulse Width Modulated Step-down Converter July 2009, Ver.01 IL494A Parameter Measurement Information 1. Dead time and Feedback Control 2. Error Amplifier Characteristics 3. Common-Emitter Configuration 4. Emitter-Follower Configuration July 2009, Ver.01 IL494A Typical Performance Curves FIGURE 1 – OSCILLATOR FREQUENCY vs. TIMING RESISTANCE FIGURE 2 – OPEN LOOP VOLTAGE GAIN AND PHASE vs. FREQUENCY FIGURE 3 – PERCENT DEAD TIME vs.OSCILLATOR FREQUENCY FIGURE 4 – PERCENT DUTY CYCLE vs. DEAD-TIME CONTROL VOLTAGE July 2009, Ver.01 IL494A FIGURE 5 – EMITTER-FOLLOWER CONFIGURATION OUTPUT-SATURATION VOLTAGE vs. EMITTER CURRENT FIGURE 6 – COMMON-EMITTER CONFIGURATION OUTPUT-SATURATION VOLTAGE vs. COLLECTOR CURRENT FUGURE 7 – STANDBY-SUPPLY CURRENT vs. SUPPLY VOLTAGE July 2009, Ver.01 IL494A July 2009, Ver.01