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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) 25C Free Air Temperature(note 2) Operating Temperature Range Storage Temperature Range Lead Temperature 1.6mm from Case for 60 Sec. SYMBOL VCC VI VO ICO PD Topr Tstg Tcase VALUE 41 VCC+0.3 41 250 1000 0 TO 70 -65 TO 150 300 UNIT V V V mA mW C C C note 1: All voltage values, except differential voltages are with respect to the network ground terminal. note 2:For operation above 25C free-air temperature, the dissipation derates with 9.2mW/C. UTC UNISONIC TECHNOLOGIES CO., LTD. 1 QW-R103-004,A UTC TL494 BLOCK DIAGRAM LINEAR INTEGRATED CIRCUIT Input control 13 8 C1 Pulse Steering Flip-Flop RT Q T Q1 6 CT oscillator 5 9 E1 11 C2 10 E2 Q Q2 dead time comparator 14 Vref 5V reference regulation 4 dead time control PWM comparator 0.7mA 12 Vcc 1 2 Error Amplifier Error Amplifier 16 15 7 GND 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 MIN Vcc Vi Vo Ic If CT RT fosc Ta 7 -0.3 VALUE MAX 40 Vcc-2 40 200 0.3 10000 500 300 70 UNIT V V V mA mA nF k kHz C 0.47 1.8 1 0 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) Vref=0 CT=0.01F,RT=120k 4.75 5 2 1 0.2 35 10 5.25 25 15 1 V mV mV % mA kHz Oscillator Section Frequency UTC UNISONIC TECHNOLOGIES CO., LTD. 2 QW-R103-004,A UTC TL494 PARAMETER Standard Deviation of Frequency Frequency Change with Voltage Frequency Change with Temperature LINEAR INTEGRATED CIRCUIT TEST CONDITIONS All Values of Vcc CT, RT, TA constant Vcc=7v to 40V,Ta=25C CT=0.01F,RT=12k,TA=MIN to MAX 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 Vcc=40V,TA=25C VID=-15mV to -5V V(pin 3)=0.5V VID=15mV to -5V V(pin 3)=3.5V VCE=40V,Vcc=40V VCC=VC=40V,VE=0 VE=0,Ic=200mA Vc=15V,IE=-200mA Vi=Vref Vi=0 to 5.25V VI(pin 40=0 Zero duty Cycle Maximum duty cycle Zero Duty cycle Vpin 3= 0.7V Vcc=15V Vcc=40V pin 6 at Vref,all other Inputs and outputs open Vpin 4=2V -2 45 3 0 4 0.7 4.5 V mA mA 3.3 MIN TYP 10 0.1 MAX UNIT % % % 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) Output source Current(pin 3) 2 25 0.2 -0.3 to Vcc-2 70 65 0.3 -2 2 1.1 1.5 100 -100 1.3 2.5 3.5 -10 mA A % V 10 250 1 mV nA A V dB kHz dB mA mA A A V Error 95 800 80 0.7 Output Section Collector off-state current Emitter off-state Current Collector -emitter Saturation Voltage Commonemitter EmitterFollower Output Control Input Current Dead Time Control Section Input bias (pin 4) Maximum duty cycle, each output Input threshold Voltage(pin 4) PWM comparator Section Input Threshold Voltage(pin 3) Input Sink Current (pin 3) 0.3 Total Device Standby Supply Current 10 6 9 7.5 15 mA Average supply current Switching Characteristics,Ta=25C 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=25C. 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 N LINEAR INTEGRATED CIRCUIT note 4: Standard deviation is a measure of the statistical distribution the mean as derived from the formula : = N-1 TEST CIRCUIT 2 (xn-x) n=1 Vcc=15V TEST INPUTS 12 4 3 12k 6 5 0.01 F 1 2 16 15 13 2W 150 2W 150 DEAD-TIME FEEDBACK RT CT Vcc C1 E1 8 9 OUTPUT 1 C2 E2 11 10 OUTPUT 2 ERROR AMPLIFIER Vref OUTPUT GND 7 OUTPUT CONTROL 14 50k 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 1 Vin 2 16 Vref 15 ERROR AMPLIFIER FEEDBACK TERMINAL ERROR AMPLIFIER FIG 2. AMPLIFIER CHARACTERISTICS Vcc 90% 90% Vc 15pF 10% tr tf 10% EACH OUTPUT CIRCUIT 68 Q EACH OUTPUT CIRCUIT Vcc 90% Q Ve 10% tr tf 10% 90% 68 15pF FIG. 3 COMMON-EMITTER CONFIGURATION FIG. 4 EMITTER -FOLLOWER CONFIGURATION PIN CONFIGURATIONS NONINV INPUT INV INPUT 1 2 16 15 14 13 12 11 10 9 NONINV INPUT INV INPUT FEEDBACK 3 DEAD-TIME CONTROL CT RT GND C1 Vref OUTPUT CONTROL 4 5 6 7 8 Vcc C2 E2 E1 UTC UNISONIC TECHNOLOGIES CO., LTD. 5 QW-R103-004,A UTC TL494 10 5 LINEAR INTEGRATED CIRCUIT 100 TYPICAL PERFORMANCE CHARACTERISTICS Vcc=15V Ta=0~70XC 80 CT=0.001F Vcc=15V V=3V Ta=25XC Oscillator Frequency (Hz) 10 Voltage Amplification (dB) 4 60 10 3 CT=0.01F 40 CT=0.1F 10 2 CT=1 F 20 10 1 0 3 10 10 4 10 5 10 6 10 2 10 3 10 4 10 5 10 6 RT(Timing Resistance) ( ) 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 |
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