TS494 Voltage Mode PWM Controller SOP-16 DIP-16 Supply Voltage Range 7 V to 40V Output Driving Current 200mA Oscillator Frequency up to 200KHz General Description The TS494 incorporates on a single monolithic chip all the functions required in the construction of a pulse-width-modulation control circuit. Designed primarily for power supply control, these devices offer the systems engineer the flexibility to tailor the power supply control circuitry to his application. The TS494 contains an error amplifier, an on-chip adjustable oscillator, a deed-time control comparator, pulse-steering control flip-flop, a 5-volt, 5% precision regulator, and output-control circuits. The error amplifier exhibits a common-mode voltage from –0.3V to Vcc –2V. The dead-time control comparator has a fixed offset that provides approximately 5% dead time when externally altered. The on-chip oscillatory be bypassed by terminating RT (pin 6) to the reference output and providing a sawtooth input to CT (pin 5), or it may be used to drive the common circuits in synchronous multiple-rail power supplies. The uncommitted output transistor provide either common-emitter or emitter-follower output capability. Each device provides for push-pull or single-ended output operation, which may be selected through the output-control function. The architecture of these devices prohibits the possibility of either output being pulsed twice during push-pull operation. The TS494 is offered in SOP-16 and DIP-16 package. Features Pin Assignment Complete PWM Power Control Circuitry Uncommitted Outputs for 200mA Sink or Source Current Output Control Selects Single-Ended or Push –Pull Operation Internal Circuitry Prohibits Double Pulse at Either Output Variable Dead-Time Provides Control over Total Range Internal Regulator Provides a Stable 5-V Reference Supply with 5% Tolerance Circuit Architecture Allows Easy Synchronization Ordering Information Applications Charger DC to DC converters Part No. TS494CD Operating Temp. 0 ~ +70 oC TS494CS TS494 1-7 Package DIP-16 SOP-16 2003/12 rev. A Function Block Diagram Absolute Maximum Rating Rating Power Supply Voltage Collector Output Voltage Collector Output Current (each transistor) Amplifier Input Voltage Range o Power Dissipation @ Ta<=45 C Thermal Resistance, Junction to Ambient Operating Junction Temperature Storage Temperature Range Operating Ambient Temperature Range Derating Ambient Temperature Symbol Value Unit Vcc 40 V Vc1, Vc2 40 V Ic1, Ic2 250 mA VIR - 30 ~ +40 V Pd 1 W RθJA 80 Tj 125 o C Tstg -55 ~ +125 o C Ta 0 ~ +70 o C 45 o C Ta o C/W Recommended Operating Conditions Rating Power Supply Voltage Symbol Min. Typ. Max Unit Vcc 7 15 40 V Vc1, Vc2 -- 30 40 V Ic1, Ic2 -- -- 200 mA Amplifier Input Voltage Vin - 0.3 -- Vcc-2.0 V Current Into Feedback Terminal Ifb -- -- 0.3 mA Reference Output Current Iref -- -- 10 mA Timing Resistor RT 1.8 30 500 KΩ CT 0.0047 0.001 10 uF Fosc 1 40 200 KHz Collector Output Voltage Collector Output Current (each transistor) Timing Capacitor Oscillator Frequency TS494 2-7 2003/12 rev. A Electrical Characteristics (Ta=25 oC, VCC = 15V, CT= 0.01uF, RT= 12kΩ; unless otherwise specified.) REFERENCE SECTION Parameter Test Conditions* Min Typ Max Unit 4.75 5 5.25 V Output voltage (Vref) Io=1mA Line regulation Vcc= 7V to 40V -- 2.0 25 Load regulation Io= 1mA to 10mA -- 3.0 15 Output voltage change with temp. ∆Ta=Min to Max -- 0.2 1 % Short-circuit output current*** Vref= 0 15 35 75 mA Frequency CT= 0.001µF, RT= 30KΩ -- 40 -- KHz Standard deviation of frequency**** CT= 0.001µF, RT= 30KΩ -- 3.0 -- Frequency change with voltage Vcc= 7V to 40V -- 0.1 -- Frequency change with temperature*** CT= 0.001µF, RT= 30KΩ -- -- 12 mV OSCILLATOR SECTION % ∆Ta= Min to Max ERROR AMPLIFIER SECTION Input offset voltage Vo= (pin 3)= 2.5V -- 2.0 10 mV Input offset current Vo= (pin 3)= 2.5V -- 5.0 250 nA Input bias current Vo= (pin 3)= 2.5V -- -0.1 -1.0 µA Common-mode input voltage range Vcc= 7V to 40V Open-loop voltage amplification ∆Vo= 3V, RL=2KΩ, -0.3 toVcc-2 V 70 95 -- dB Vo= 0.5 to 3.5V Unity-gain bandwidth RL= 2KΩ, Vo= 0.5 to 3.5V -- 800 -- KHz Common-mode rejection ratio ∆Vo= 40V 65 90 -- dB Power Supply Rejection Ratio ∆Vcc= 33V, Vo= 2.5V, -- 100 -- dB 0.3 0.7 -- mA 2.0 -4.0 -- mA µA RL= 2KΩ Output sink current (pin 3) VID= -15mV to -5V, V(pin3)= 0.7V Output source current (pin 3) VID= 15mV to 5V, V(pin3)= 3.5V OUTPUT SECTION Collector off-state current VCE= 40V, VCC= 40V -- 2.0 100 Emitter off-state current Vcc= 40V, VE= 0 -- -- -100 Collector-emitter Common-emitter VE= 0, Ic= 200mA -- 1.1 1.3 saturation voltage Emitter-follower Vc= 15V, IE= -200mA -- 1.5 2.5 VI= Vref -- -- 3.5 mA Input bias current (pin 4) VI= 0 to 5.25V -- -2.0 -10 µA Maximum duty cycle, each output Vi(pin 4)= 0, CT= 0.1µF, -- 45 50 % Input threshold voltage(pin 4) Zero duty cycle -- 3.0 3.3 Maximum duty cycle 0 -- -- Output control input current V DEAD-TIME CONTROL SECTION RT= 12KΩ TS494 3-7 2003/12 rev. A V Electrical Characteristics (continues) PWM COMPARATOR SECTION Parameter Test Conditions* Min Typ Max Unit Input threshold voltage (pin 3) Zero duty cycle -- 4.0 4.5 V Input sink current (pin 3) V (pin 3)=0.7V 0.3 0.7 -- mA mA TOTAL DEVICE Standby supply current pin 6 at Vref, all Vcc=15V -- 6.0 10 other inputs and Vcc=40V -- 9.0 15 Vi (pin4)= 2V, See Figure 1 -- 7.5 -- Output voltage rise time Common-emitter configuration, -- 100 200 Output voltage fall time See Figure 3 -- 25 100 Output voltage rise time Emitter-follower configuration, -- 100 200 Output voltage fall time See Figure 4 -- 40 100 5.5 6.43 7.0 outputs open Average supply current SWITCHING CHARACTERISTICS ns UNDERVOLTAGE LOCKOUT SECTION Turn-on Threshold Vcc increasing Iref = 1.0mA Remark: o z All typical value except for temperature coefficient are at Ta= 25 C z For conditions shown as Min or Max, use the appropriate value specified under recommended operating conditions. z All typical values except for parameter changes with temperature are at Ta= 25 oC z Duration of the short-circuit should not exceed one second z Standard deviation is a measure of the statistical distribution about the mean as derived from the formula ⎡ N ( x − x) 2 ⎤ ⎥ σ = ⎢∑ n ⎢⎣ n =1 N − 1 ⎥⎦ z 1 2 Temperature coefficient of timing capacitor and timing resistor not taken into account TS494 4-7 2003/12 rev. A V Parameter Measurement Information TS494 5-7 2003/12 rev. A Parameter Measurement Information (continues) TS494 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 TS494 D A B C D G J K L M SOP-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