UTC TL494 LINEAR INTEGRATED CIRCUIT VOLTAGE MODE PWM CONTROL CIRCUIT DESCRIPTION The UTC TL494 incorporates all the functions required in the construction of a pulse-width modulation switching circuit. Designed primarily for switching power supply control or DCDC convectors, it offers the systems engineer the flexibility to tailor control circuitry to its own application. SOP-16 FEATURES *Complete PWM power control circuitry *Uncommitted outputs for 200 mA sink or source current *Output control selects single ended or push pull operation *Internal circuitry prohibits double pulses over total range *Easy synchronization DIP-16 ABSOLUTE MAXIMUM RATINGS(Unless otherwise noted all is over operating free air temperature range) PARAMETER Supply Voltage(note 1) Amplifier Input Voltage Collector Output Voltage Collector Output Current Continuous Total Dissipation at(or for below) 25°C Free Air Temperature(note 2) Operating Temperature Range Storage Temperature Range Lead Temperature 1.6mm from Case for 60 Sec. SYMBOL VALUE UNIT VCC VI VO ICO PD 41 VCC+0.3 41 250 1000 V V V mA mW Topr Tstg Tcase 0 TO 70 -65 TO 150 300 °C °C °C note 1: All voltage values, except differential voltages are with respect to the network ground terminal. note 2:For operation above 25°C free-air temperature, the dissipation derates with 9.2mW/°C. UTC UNISONIC TECHNOLOGIES CO., LTD. 1 QW-R103-004,A UTC TL494 LINEAR INTEGRATED CIRCUIT BLOCK DIAGRAM Input control Pulse Steering Flip-Flop 13 8 C1 RT 6 Q Q1 Q Q2 T CT oscillator 5 9 E1 11 C2 10 E2 dead time comparator 14 4 Vref dead time control 5V reference regulation PWM comparator 12 Vcc 0.7mA 1 16 7 2 15 GND Error Amplifier Error Amplifier 3 RECOMMENDED OPERATING CONDITIONS PARAMETER Supply Voltage Amplifier Input Voltage Collector Output Voltage Collector Output Current(each Transistor) Current into Feedback Timing Capacitor Timing Resistor Oscillator Frequency Operating Free-Air Temperature SYMBOL VALUE Vcc Vi Vo Ic If CT RT fosc Ta UNIT MIN MAX 7 -0.3 40 Vcc-2 40 200 0.3 10000 500 300 70 0.47 1.8 1 0 V V V mA mA nF kΩ kHz °C ELECTRICAL CHARACTERISTICS (Over recommended operating free-air temperature range,VCC=15V,f=1kHz,Unless otherwise specified) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Reference Section Output Voltage Input Regulation Output Regulation Output Voltage Change with Temperature Short-Circuit Output Current Io=1mA Vcc=7V to 40V Io=1 to 10mA ∆TA=MIN to MAX(note 2) 4.75 5 2 1 0.2 5.25 25 15 1 V mV mV % Vref=0 35 mA CT=0.01µF,RT=120kΩ 10 kHz Oscillator Section Frequency UTC UNISONIC TECHNOLOGIES CO., LTD. 2 QW-R103-004,A UTC TL494 LINEAR INTEGRATED CIRCUIT PARAMETER TEST CONDITIONS Standard Deviation of Frequency MIN All Values of Vcc CT, RT, TA constant Vcc=7v to 40V,Ta=25°C CT=0.01µF,RT=12kΩ,∆TA=MIN to MAX Frequency Change with Voltage Frequency Change with Temperature TYP MAX 10 UNIT % 0.1 12 % % Amplifier Section Input Offset Voltage Input Offset Current Input Bias Current Common-Mode Input Voltage Range Open-Loop Voltage Amplification Unity-Gain Bandwidth Common-Mode Rejection Ratio Output Sink Current(pin 3) Error Error Vo(pin 3)=2.5V Vo(pin 3)=2.5V Vo(pin 3)=2.5V Vcc=7V to 40 V ∆Vo=3V, Vo=0.5V to 3.5V Error Output source Current(pin 3) Vcc=40V,TA=25°C VID=-15mV to -5V V(pin 3)=0.5V VID=15mV to -5V V(pin 3)=3.5V 2 25 0.2 -0.3 to Vcc-2 70 65 0.3 10 250 1 95 800 80 0.7 mV nA µA V dB kHz dB mA -2 mA Output Section Collector off-state current Emitter off-state Current Collector -emitter Saturation Voltage Commonemitter EmitterFollower Output Control Input Current VCE=40V,Vcc=40V VCC=VC=40V,VE=0 VE=0,Ic=200mA 2 1.1 100 -100 1.3 Vc=15V,IE=-200mA 1.5 2.5 Vi=Vref µA µA V 3.5 mA -2 -10 3 3.3 µA % V 4 0.7 4.5 V mA 10 mA Dead Time Control Section Input bias (pin 4) Maximum duty cycle, each output Input threshold Voltage(pin 4) Vi=0 to 5.25V VI(pin 40=0 Zero duty Cycle Maximum duty cycle 45 0 PWM comparator Section Input Threshold Voltage(pin 3) Input Sink Current (pin 3) Zero Duty cycle Vpin 3= 0.7V 0.3 Total Device Standby Supply Current Vcc=15V pin 6 at Vref,all other Inputs and outputs open Vcc=40V Average supply current Vpin 4=2V 6 9 7.5 15 mA Switching Characteristics,Ta=25°C Output Voltage Rise Time Common-emitter configuration 100 200 ns Output Voltage Fall Time 25 100 ns Output Voltage Rise Time Emitter-follower configuration 100 200 ns Output Voltage Fall Time 40 100 ns note 1:All typical Values except for temperature coefficient are at Ta=25°C. note 2:For conditions shown as MIN or MAX, use appropriate value under recommended operating conditions. note 3:Duration of the short-circuit should not exceed one second. UTC UNISONIC TECHNOLOGIES CO., LTD. 3 QW-R103-004,A UTC TL494 LINEAR INTEGRATED CIRCUIT note 4: Standard deviation is a measure of the statistical distribution the mean as derived from the formula : N σ= ΣN-1 2 (xn-x) n=1 TEST CIRCUIT Vcc=15V 2W 150 Ω 12 TEST INPUTS 12kΩ 0.01 µF 4 DEAD-TIME 3 FEEDBACK 6 RT 5 CT Vcc 1 C1 8 E1 9 2W 150 Ω OUTPUT 1 C2 11 E2 10 OUTPUT 2 2 ERROR AMPLIFIER 16 15 13 Vref OUTPUT OUTPUT CONTROL 14 GND 50kΩ 7 VOLTAGE at C1 VOLTAGE at C2 VOLTAGE at CT DEAD-TIME CONTROL INPUT THRESHOLD VOLTAGE THRESHOLD VOLTAGE FEEDBACK FIG 1. OPERATIONAL TEST CIRCUIT AND WAVEFORMS UTC UNISONIC TECHNOLOGIES CO., LTD. 4 QW-R103-004,A UTC TL494 LINEAR INTEGRATED CIRCUIT ERROR AMPLIFIER 1 Vin FEEDBACK TERMINAL 2 16 Vref 15 ERROR AMPLIFIER FIG 2. AMPLIFIER CHARACTERISTICS Vcc 90% EACH OUTPUT CIRCUIT 68Ω Vcc 90% 90% Q Vc Q 15pF 10% Ve 10% tr FIG. 3 EACH OUTPUT CIRCUIT 90% 68Ω 15pF 10% 10% tr tf tf COMMON-EMITTER CONFIGURATION FIG. 4 EMITTER -FOLLOWER CONFIGURATION PIN CONFIGURATIONS NONINV INPUT 1 16 NONINV INPUT INV INPUT 2 15 INV INPUT FEEDBACK 3 14 Vref 4 13 OUTPUT CONTROL CT 5 12 Vcc RT 6 11 C2 GND 7 10 E2 C1 8 9 E1 DEAD-TIME CONTROL UTC UNISONIC TECHNOLOGIES CO., LTD. 5 QW-R103-004,A UTC TL494 LINEAR INTEGRATED CIRCUIT TYPICAL PERFORMANCE CHARACTERISTICS 100 5 10 Vcc=15V Ta=0~70¢XC Vcc=15V ∆V=3V Ta=25¢XC 4 CT=0.001µF 10 CT=0.01µF 3 10 CT=0.1µF 2 10 CT=1 µF 1 Voltage Amplification (dB) Oscillator Frequency (Hz) 80 60 40 20 0 10 3 10 4 10 10 5 6 10 2 10 3 10 4 10 5 10 6 10 RT(Timing Resistance) ( Ω ) Frequency (Hz) FIG 5. Oscillator Frequency and Frequency Variation Vs Timing Resistance Fig.6 Amplifier Voltage Amplification UTC UNISONIC TECHNOLOGIES CO., LTD. 6 QW-R103-004,A