TS1451 Dual Channel PWM Controller DIP-16 SOP-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 Pin Assignments 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 Applications Pin Descriptions Backlight Inverter DC to DC Converters in Computers Name CT Timing Capacitor RT Timing Resistor EA+ Ordering Information Part No. TS1451CD TS1451CS TS1451 Operating Temp. o 0 ~ +70 C Descriptions Error Amplifier Input (+) EA- Error Amplifier Input (-) FB Feedback Loop Compensation DTC Dead Time Control DIP-16 Out Pre-Driver Output SOP-16 Gnd Ground Vcc Supply Voltage SCP Short Circuit Protection Ref Voltage Reference Package 1-7 2003/12 rev. A Function Block Diagram Absolute Maximum Rating Rating Symbol Value Unit Power Supply Voltage Vcc 40 V Collector Output Voltage Vo 40 V Collector Output Current Io 21 mA Vin 20 Amplifier Input Voltage Range Operating Junction Temperature Tj Storage Temperature Range Tstg Lead Temperature 1.6mm from case for 10 sec. Tled V - 20 ~ +85 o C -65 ~ +150 o C 260 o C Recommended Operating Conditions Rating Symbol Min. Max Unit Power Supply Voltage Vcc 3.6 40 V Collector Output Voltage Vo -- 40 V Collector Output Current (each transistor) Io -- 20 mA Amplifier Input Voltage Vin 1.05 1.45 V Current Into Feedback Terminal Ifb -- 45 uA Feedback Resistor Rf 100 -- KΩ Timing Resistor RT 5.1 100 KΩ Timing Capacitor CT 150 15000 pF Fosc 1 500 KHz Oscillator Frequency TS1451 2-7 2003/12 rev. A Electrical Characteristics (Ta= 25oC, VCC = 6V, f= 200KHz; unless otherwise specified) REFERENCE SECTION Parameter Test Conditions Min Typ Max Unit 2.45 2.5 2.6 V Output voltage (Vref) Io=1mA Line regulation Vcc= 3.6V to 40V -- 2.0 12.5 Load regulation Io= 0.1mA to 1mA -- 1.0 7.5 Output voltage change with temp. ∆Ta=Min to Max -- - 0.2 +/-1 % Short-circuit output current Vref= 0 3 10 30 mA Min Typ Max Unit -- 2.65 -- V -- 2.45 -- V 80 200 -- mV Min Typ Max Unit 0.65 0.7 0.75 V mV UNDERVOLTAGE LOCKOUT SECTION Parameter Test Conditions Upper threshold voltage (Vcc) Lower threshold voltage (Vcc) Io(ref)= 0.1mA Hysterics (Vcc) SHORT-CIRCUIT PROTECTION CONTROL SECTION Parameter Test Conditions Input threshold voltage Standby voltage No pull up 140 185 --230 mV Latched input voltage No pull up -- 60 120 mV Input (source) current Vin= 0.7V - 10 - 15 - 20 uA -- 1.18 -- V Min Typ Max Unit KHz Comparator threshold voltage (FB) OSCILLATOR SECTION Parameter Test Conditions Frequency CT= 330pF, RT= 10KΩ -- 200 -- Standard deviation of frequency CT= 330pF, RT= 10KΩ -- 10 -- Frequency change with voltage Vcc= 3.6V to 40V -- 1 -- Frequency change with temperature ∆Ta= Min to Max -- -- +/- 2 Min Typ Max Unit -- -- 1 uA - 80 - 145 -- 2.3 -- -- -- 2.05 2.25 1.2 1.45 -- Min Typ Max Unit % DEAD-TIME CONTROL SECTION Parameter Test Conditions Input bias current Latch mode (source) current Latch input voltage Io= 40uA Input threshold voltage at f= 10KHz Zero duty cycle Maximum duty cycle V OUTPUT SECTION Parameter Test Conditions Leakage current Vo= 40V -- -- 10 uA Output saturation voltage Io= 10mA -- 1.2 2 V Short-circuit output current Vo= 6V -- 90 -- mA TS1451 3-7 2003/12 rev. A Electrical Characteristics (Continued) ERROR AMPLIFIER SECTION Parameter Test Conditions Min Typ Max Unit Input offset voltage Vo(FB)= 1.25V -- -- +/- 6 mV Input offset current Vo(FB)= 1.25V -- -- +/- 100 nA Input bias current Vo(FB)= 1.25V -- 160 500 nA Common-mode input voltage range Vcc= 3.6V to 40V Open-loop voltage amplification Rf= 200KΩ 1.05 to 1.45 V 70 80 -- dB Unity-gain bandwidth -- 1.5 -- MHz Common-mode rejection ratio 60 80 -- dB Maximum output voltage Vref-0.1 -- -- V Minimum output voltage -- -- 1 V Output sink current (FB) VID= -0.1, Vo= 1.25V 0.5 1.6 -- mA Output source current (FB) VID= 0.1, Vo= 1.25V -45 -70 -- uA Min Typ Max Unit -- 2.05 2.25 V 1.2 1.45 -- mA Min Typ Max Unit mA PWM COMPARATOR SECTION Parameter Input threshold voltage (FB) Test Conditions Zero duty cycle f= 10KHz Input sink current (pin 3) Maximum duty cycle TOTAL DEVICE Parameter Test Conditions Standby supply current Off-state -- 2.5 3.0 Average supply current RT= 10KΩ -- 2.8 3.5 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 R M F MILLIMETERS INCHES A MIN 9.80 MAX 10.00 MIN 0.386 MAX 0.393 B 3.80 4.00 0.150 0.157 C D 1.35 0.35 1.75 0.49 0.054 0.014 0.068 0.019 F 0.40 1.25 0.016 0.049 G K 1.27 (typ) 0.10 0.25 0.05 (typ) 0.004 0.009 M 0o 7o 0o 7o P R 5.80 0.25 6.20 0.50 0.229 0.010 0.244 0.019 DIP-16 Mechanical Drawing A 16 DIM 9 B 1 8 L N C J K G TS1451 D A B C D G J K L M 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 M 7-7 2003/12 rev. A