TS1451

TS1451 Dual Channel PWM Controller SOP-16 DIP-16 Supply Voltage Range 3.6 V to 40V Output Driving Current 20mA Oscillator Frequency up to 500KHz General Description The TS1451 integrates dual channel PWM control circuit into a single chip, mainly designs for power supply regulator. All the functions included an on-chip 2.5V reference output, two error amplifiers, and adjustable oscillator, two dead-time comparators, under voltage lock out, short circuit protection, and dual common-emitter output transistor circuit. Recommend the output CE transistors as pre-driver for driving extremely. the dead time control can provide from 0% to 100%. Switching frequency can be adjustable by trimming RT and CT. During low Vcc situation, the under voltage lock out makes sure that the output are off until the internal circuit is operational normally. The TS1451 is offered in SOP-16 and DIP-16 package. Features Dual PWM Power Control Circuitry Operating Voltage Can be up to 50V Adjustable Dead Time Control (DTC) Under Voltage Lock Out protection (UVLO) Short Circuit Protection (SCP) Variable Oscillator Frequency up to 500KHz 2.5V Voltage Reference Output Pin Assignments Applications Backlight Inverter DC to DC Converters in Computers Pin Descriptions Name CT RT EA+ Descriptions Timing Capacitor Timing Resistor Error Amplifier Input (+) Error Amplifier Input (-) Feedback Loop Compensation Dead Time Control Pre-Driver Output Ground Supply Voltage Short Circuit Protection Voltage Reference Ordering Information Part No. TS1451CD TS1451CS EAFB Operating Temp. 0 ~ +70 C o Package DIP-16 SOP-16 DTC Out Gnd Vcc SCP Ref TS1451 1-7 2003/12 rev. A Function Block Diagram Absolute Maximum Rating Rating Power Supply Voltage Collector Output Voltage Collector Output Current Amplifier Input Voltage Range Operating Junction Temperature Storage Temperature Range Lead Temperature 1.6mm from case for 10 sec. Symbol Vcc Vo Io Vin Tj Tstg Tled Value 40 40 21 20 - 20 ~ +85 -65 ~ +150 260 Unit V V mA V o o o C C C Recommended Operating Conditions Rating Power Supply Voltage Collector Output Voltage Collector Output Current (each transistor) Amplifier Input Voltage Current Into Feedback Terminal Feedback Resistor Timing Resistor Timing Capacitor Oscillator Frequency Symbol Vcc Vo Io Vin Ifb Rf RT CT Fosc Min. 3.6 --1.05 -100 5.1 150 1 Max 40 40 20 1.45 45 -100 15000 500 Unit V V mA V uA KΩ KΩ pF KHz TS1451 2-7 2003/12 rev. A Electrical Characteristics (Ta= 25oC, VCC = 6V, f= 200KHz; unless otherwise specified) REFERENCE SECTION Parameter Output voltage (Vref) Line regulation Load regulation Output voltage change with temp. Short-circuit output current UNDERVOLTAGE LOCKOUT SECTION Parameter Upper threshold voltage (Vcc) Lower threshold voltage (Vcc) Hysterics (Vcc) SHORT-CIRCUIT PROTECTION CONTROL SECTION Parameter Input threshold voltage Standby voltage Latched input voltage Input (source) current Comparator threshold voltage (FB) OSCILLATOR SECTION Parameter Frequency Standard deviation of frequency Frequency change with voltage Frequency change with temperature DEAD-TIME CONTROL SECTION Parameter Input bias current Latch mode (source) current Latch input voltage Input threshold voltage at f= 10KHz Io= 40uA Zero duty cycle Maximum duty cycle OUTPUT SECTION Parameter Leakage current Output saturation voltage Short-circuit output current Test Conditions Vo= 40V Io= 10mA Vo= 6V Min ---Typ -1.2 90 Max 10 2 -Unit uA V mA Test Conditions Min -- 80 2.3 -1.2 Typ -- 145 -2.05 1.45 Max 1 --2.25 -V Unit uA Test Conditions CT= 330pF, RT= 10KΩ CT= 330pF, RT= 10KΩ Vcc= 3.6V to 40V ∆Ta= Min to Max Min ----Typ 200 10 1 -Max ---+/- 2 % Unit KHz No pull up No pull up Vin= 0.7V Test Conditions Min 0.65 140 -- 10 -Typ 0.7 185 60 - 15 1.18 Max 0.75 --230 120 - 20 -Unit V mV mV uA V Io(ref)= 0.1mA Test Conditions Min --80 Typ 2.65 2.45 200 Max ---Unit V V mV Test Conditions Io=1mA Vcc= 3.6V to 40V Io= 0.1mA to 1mA ∆Ta=Min to Max Vref= 0 Min 2.45 ---3 Typ 2.5 2.0 1.0 - 0.2 10 Max 2.6 12.5 7.5 +/-1 30 Unit V mV % mA TS1451 3-7 2003/12 rev. A Electrical Characteristics (Continued) ERROR AMPLIFIER SECTION Parameter 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 Maximum output voltage Minimum output voltage Output sink current (FB) Output source current (FB) PWM COMPARATOR SECTION Parameter Input threshold voltage (FB) f= 10KHz Input sink current (pin 3) TOTAL DEVICE Parameter Standby supply current Average supply current Test Conditions Off-state RT= 10KΩ Min --Typ 2.5 2.8 Max 3.0 3.5 Unit mA Maximum duty cycle 1.2 1.45 -mA Test Conditions Zero duty cycle Min -Typ 2.05 Max 2.25 Unit V VID= -0.1, Vo= 1.25V VID= 0.1, Vo= 1.25V Test Conditions Vo(FB)= 1.25V Vo(FB)= 1.25V Vo(FB)= 1.25V Vcc= 3.6V to 40V Rf= 200KΩ 70 -60 Vref-0.1 -0.5 -45 Min ---Typ --160 1.05 to 1.45 80 1.5 80 --1.6 -70 ----1 --Max +/- 6 +/- 100 500 Unit mV nA nA V dB MHz dB V V mA uA TS1451 4-7 2003/12 rev. A Parameter Measurement Information TS1451 5-7 2003/12 rev. A Application Information Fig 3. High Speed Dual Switching Regulator TS1451 6-7 2003/12 rev. A SOP-16 Mechanical Drawing SOP-16 DIMENSION DIM A B C D F G K M F MILLIMETERS MIN 9.80 3.80 1.35 0.35 0.40 MAX 10.00 4.00 1.75 0.49 1.25 INCHES MIN 0.386 0.150 0.054 0.014 0.016 MAX 0.393 0.157 0.068 0.019 0.049 R M 1.27 (typ) 0.10 0.25 0o 5.80 0.25 7o 6.20 0.50 0.05 (typ) 0.004 0.009 0o 0.229 0.010 7o 0.244 0.019 P R DIP-16 Mechanical Drawing A DIP-16 DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX 17.80 18.05 0.701 0.710 6.22 6.48 0.290 0.299 3.18 4.45 0.125 0.135 0.35 0.55 0.019 0.020 1.27 (typ) 0.05 (typ) 0.25 0.31 0.010 0.012 3.25 3.35 0.128 0.132 7.75 8.00 0.305 0.315 10o 10o 16 1 9 B 8 DIM A B C D G J K L M L NC J K G D M TS1451 7-7 2003/12 rev. A