TECHNI CAL DATA PWM Control Circuit IL494 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 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 ORDERI NG I NFORM ATI ON Device Operating Temperature Range IL494N IL494D IL494DT 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 2011, February, Rev. 02 I L 494 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 * Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. 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 KΩ 1 300 KHz -20 +85 °C Oscillator Frequency TA Operating Free-Air Temperature 2011, February, Rev. 02 I L 494 ELECTRICAL CHARACTERISTICS (Temperature -20 ∼ 85°C, VCC = 15 V, f=10 kHz)) Symbol Parameter Test Conditions Min Max Unit 4.90 5.10 V Reference Section Vref Output Voltage IO=1 mA Vregin Output regulation VCC=7 V to 40 V, TA=25°C 25 mV Vregout Input regulation IO=1 to 10 mA, TA=25°C 15 mV ∆Vref Output Voltage change with temperature TA= -20°C to 85°C 1 % ISC Short-circuit output current (Note 1) Vref=0 50 mA 14 KHz Oscillator Section fOSC Frequency CT=0.01 µF, RT=12 kΩ δfOSC Standard deviation of frequency (Note 2) All values of VCC, CT, RT, TA Constant 15 % δfOSC(∆V) Frequency change with voltage VCC= 7 V to 40 V, TA=25°C 10 % δfOSC(∆T) Frequency change with temperature CT=0.01 µF, RT=12 kΩ TA= -20°C to 85°C 2 % -10 µA 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 µA 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=25°C 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 2011, February, Rev. 02 I L 494 ELECTRICAL CHARACTERISTICS (Temperature -20 ∼ 85°C, 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 µA IE(off) Emitter off-state current VCC=VC=40 V, VE=0 -100 µA 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 σ= N–1 2011, February, Rev. 02 I L 494 Typical Application Pulse Width Modulated Step-down Converter 2011, February, Rev. 02 I L 494 Parameter Measurement Information 1. Dead time and Feedback Control 2. Error Amplifier Characteristics 3. Common-Emitter Configuration 4. Emitter-Follower Configuration 2011, February, Rev. 02 I L 494 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 2011, February, Rev. 02 I L 494 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 2011, February, Rev. 02 I L 494 N SUFFIX PLASTIC DIP (MS - 001BB) A Dimension, mm 9 16 Symbol MIN MAX A 18.67 19.69 B 6.1 7.11 B 1 8 C F L C 5.33 D 0.36 0.56 F 1.14 1.78 G 2.54 H 7.62 -T- SEATING PLANE N G K M H D J 0.25 (0.010) M T NOTES: 1. Dimensions “A”, “B” do not include mold flash or protrusions. Maximum mold flash or protrusions 0.25 mm (0.010) per side. J 0° 10° K 2.92 3.81 L 7.62 8.26 M 0.2 0.36 N 0.38 D SUFFIX SOIC (MS - 012AC) Dimension, mm A 16 9 H B 1 G P 8 R x 45 C -TK D SEATING PLANE J 0.25 (0.010) M T C M NOTES: 1. Dimensions A and B do not include mold flash or protrusion. 2. Maximum mold flash or protrusion 0.15 mm (0.006) per side for A; for B ‑ 0.25 mm (0.010) per side. F M Symbol MIN MAX A 9.8 10 B 3.8 4 C 1.35 1.75 D 0.33 0.51 F 0.4 1.27 G 1.27 H 5.72 J 0° 8° K 0.1 0.25 M 0.19 0.25 P 5.8 6.2 R 0.25 0.5 2011, February, Rev. 02