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| UTC TL1451 LINEAR INTEGRATED CIRCUIT DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS DESCRIPTION The UTC TL1451 incorporates on a single monolithic chip all the functions required in the construction of two pulsewidth-modulation (PWM) control circuits. Designed primarily for power supply control, the TL1451 contains an on-chip 2.5V regulator, two error amplifiers, an adjustable oscillator, two dead-time comparators, undervoltage lockout circuitry, and dual common -emitter output transistor circuits. SOP-16 FEATURES *Complete PWM Power control Circuitry *Completely Synchronized Operation *Internal Undervoltage Lockout Protection *Wide Supply Voltage Range *Internal Short-Circuit Protection *Oscillator Frequency ... 500kHz Max *Variable Dead Time Provides Control Over Total Range *Internal Regulator Provides a Stable 2.5V Reference Supply DIP-16 PIN CONFIGURATIONS CT RT ERROR AMPLIFIER 1 1 IN+ 1 IN- 1 2 3 4 5 6 7 8 16 15 REF SCP ERROR AMPLIFIER 2 14 2 IN+ 13 12 11 10 9 2 IN- 1 FEEDBACK 1 DTC 1 OUT GND 2 FEEDBACK 2 DTC 2 OUT Vcc UTC UNISONIC TECHNOLOGIES CO., LTD. 1 QW-R103-011,A UTC TL1451 BLOCK DIAGRAM LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO., LTD. 2 QW-R103-011,A UTC TL1451 range) LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS(Unless otherwise noted all is over operating free air temperature PARAMETER Supply Voltage Amplifier Input Voltage Collector Output Voltage Collector Output Current Power Dissipation : TA25C DIP SOP Operating free-air Temperature Range Storage Temperature Range Lead Temperature 1.6mm from Case for 10 Sec. SYMBOL VCC VI VO IO VALUE 51 20 51 21 1000 500 -20 TO 85 -65 TO 150 260 UNIT V V V mA mW TA Tstg Tcase C C C RECOMMENDED OPERATING CONDITIONS PARAMETER Supply Voltage Amplifier Input Voltage Collector Output Voltage Collector Output Current(each Transistor) Current into Feedback Terminal Feedback Resistor Timing Capacitor Timing Resistor Oscillator frequency Operating Free-Air Temperature SYMBOL MIN Vcc Vi Vo Io RF CT RT TA 3.6 1.05 VALUE MAX 50 1.45 50 20 45 15000 100 500 85 UNIT V V V mA A k pF k kHz C 100 150 5.1 1 -20 ELECTRICAL CHARACTERISTICS (Over recommended operating free-air temperature range,VCC=6V,f=200kHz,TA=25C ,Unless otherwise specified) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Reference Section Output Voltage Output Voltage Change with Temperature Input Voltage Regulation Output Voltage Regulation Short-Circuit Output Current Io=1mA TA=-20C to 25C TA=25C to 85C Vcc=3.6V to 40V Io=0.1mA to 1mA Vo=0 2.4 2.5 -0.1 -0.2 2 1 10 2.72 2.6 120 1.9 0.7 0.75 2.6 1% 1% 12.5 7.5 30 V 3 mV mV mA V V mV V V Undervoltage Lockout Section Upper Threshold Voltage (Vcc) Lower Threshold Voltage (Vcc) Hysteresis (Vcc) Reset Threshold voltage (Vcc) Io(ref)=0.1mA, TA=25C 80 1.5 0.65 Short-Circuit Protection Control Section Input Threshold Voltage(SCP) TA=25C UTC UNISONIC TECHNOLOGIES CO., LTD. 3 QW-R103-011,A UTC TL1451 PARAMETER LINEAR INTEGRATED CIRCUIT TEST CONDITIONS No pullup No pullup VI=0.7V,TA=25C MIN 140 -10 TYP 185 60 -15 1.18 200 10% 1% -0.4% -0.2% MAX 230 120 -20 UNIT mV mV A V kHz Standby Voltage(SCP) Latched Input Voltage (SCP) Input (source) Current Comparator Threshold Voltage (FEEDBACK) Oscillator Section Frequency Standard deviation of frequency Frequency Change with Voltage Frequency Change with Temperature CT=330pF, RT=10k CT=330pF, RT=10k Vcc=3.6V to 40V TA=-20C to 25C TA=25C to 85C 2% 2% 1 A A V V Dead-Time Control Section Input bias Current (DTC) Latch mode (source) Current (DTC) Latched Input Voltage (DTC) Input threshold Voltage at f=10kHz (DTC) Error-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 Positive Output Voltage Swing Negative Output Voltage Swing Output (sink) Current (FEEDBACK) Output (source) Current (FEEDBACK) Output Section Collector off-state Current Output Saturation Voltage Short-Circuit Output Current TA=25C Io=40A Zero duty cycle Maximum duty cycle Vo (FEEDBACK)=1.25V Vo (FEEDBACK)=1.25V Vo (FEEDBACK)=1.25V Vcc=3.6V to 40V RF=200k -80 2.3 1.2 -145 2.05 1.45 2.25 160 1.05 to 1.45 70 60 Vref0.1 6 100 500 mV nA nA V dB MHz dB V 80 1.5 80 1 VID=-0.1V,Vo=1.25V VID=-0.1V,Vo=1.25V Vo=50V Io=10mA Vo=6V Zero duty cycle Maximum duty cycle Off-state RT=10k 0.5 -45 1.6 -70 10 2 V mA A A V mA V 1.2 90 2.05 1.45 1.3 1.7 PWM Comparator Section Input Threshold Voltage at f=10kHz (FEEDBACK) TOTAL DEVICE Standby Supply Current Average Supply Current 2.25 1.2 1.8 2.4 mA mA UTC UNISONIC TECHNOLOGIES CO., LTD. 4 QW-R103-011,A UTC TL1451 TEST CIRCUIT LINEAR INTEGRATED CIRCUIT TIMING DIAGRAM UTC UNISONIC TECHNOLOGIES CO., LTD. 5 QW-R103-011,A |
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