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| 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 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 Pin Assignment Applications Charger DC to DC converters Ordering Information Part No. TS494CD TS494CS Operating Temp. 0 ~ +70 oC Package DIP-16 SOP-16 TS494 1-7 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 Power Dissipation @ Ta<=45 C Thermal Resistance, Junction to Ambient Operating Junction Temperature Storage Temperature Range Operating Ambient Temperature Range Derating Ambient Temperature o Symbol Vcc Vc1, Vc2 Ic1, Ic2 VIR Pd RJA Tj Tstg Ta Ta Value 40 40 250 - 30 ~ +40 1 80 125 -55 ~ +125 0 ~ +70 45 Unit V V mA V W o C/W o o o o C 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 Reference Output Current Timing Resistor Timing Capacitor Oscillator Frequency Symbol Vcc Vc1, Vc2 Ic1, Ic2 Vin Ifb Iref RT CT Fosc Min. 7 --- 0.3 --1.8 0.0047 1 Typ. 15 30 ----30 0.001 40 Max 40 40 200 Vcc-2.0 0.3 10 500 10 200 Unit V V mA V mA mA K uF KHz TS494 2-7 2003/12 rev. A Electrical Characteristics (Ta=25 oC, VCC = 15V, CT= 0.01uF, RT= 12k; unless otherwise specified.) REFERENCE SECTION Parameter Output voltage (Vref) Line regulation Load regulation Output voltage change with temp. Short-circuit output current*** OSCILLATOR SECTION Frequency Standard deviation of frequency**** Frequency change with voltage Frequency change with temperature*** CT= 0.001F, RT= 30K CT= 0.001F, RT= 30K Vcc= 7V to 40V CT= 0.001F, RT= 30K Ta= Min to Max 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 Power Supply Rejection Ratio Output sink current (pin 3) Output source current (pin 3) Vo= (pin 3)= 2.5V Vo= (pin 3)= 2.5V Vo= (pin 3)= 2.5V Vcc= 7V to 40V Vo= 3V, RL=2K, Vo= 0.5 to 3.5V RL= 2K, Vo= 0.5 to 3.5V Vo= 40V Vcc= 33V, Vo= 2.5V, RL= 2K VID= -15mV to -5V, V(pin3)= 0.7V VID= 15mV to 5V, V(pin3)= 3.5V OUTPUT SECTION Collector off-state current Emitter off-state current Collector-emitter saturation voltage Common-emitter Emitter-follower VCE= 40V, VCC= 40V Vcc= 40V, VE= 0 VE= 0, Ic= 200mA Vc= 15V, IE= -200mA VI= Vref VI= 0 to 5.25V Vi(pin 4)= 0, CT= 0.1F, RT= 12K Input threshold voltage(pin 4) Zero duty cycle Maximum duty cycle -0 3.0 -3.3 -V -----2.0 -1.1 1.5 -100 -100 1.3 2.5 3.5 mA A % V A 2.0 -4.0 -mA 0.3 0.7 -mA -65 -800 90 100 ---KHz dB dB 70 ---2.0 5.0 -0.1 -0.3 toVcc-2 95 -10 250 -1.0 mV nA A V dB ----40 3.0 0.1 ----12 % KHz Test Conditions* Io=1mA Vcc= 7V to 40V Io= 1mA to 10mA Ta=Min to Max Vref= 0 Min 4.75 ---15 Typ 5 2.0 3.0 0.2 35 Max 5.25 25 15 1 75 Unit V mV % mA Output control input current DEAD-TIME CONTROL SECTION Input bias current (pin 4) Maximum duty cycle, each output --- -2.0 45 -10 50 TS494 3-7 2003/12 rev. A Electrical Characteristics (continues) PWM COMPARATOR SECTION Parameter Input threshold voltage (pin 3) Input sink current (pin 3) TOTAL DEVICE Standby supply current pin 6 at Vref, all other inputs and outputs open Average supply current SWITCHING CHARACTERISTICS Output voltage rise time Output voltage fall time Output voltage rise time Output voltage fall time UNDERVOLTAGE LOCKOUT SECTION Turn-on Threshold Vcc increasing Iref = 1.0mA 5.5 6.43 7.0 V Common-emitter configuration, See Figure 3 Emitter-follower configuration, See Figure 4 ----100 25 100 40 200 100 200 100 ns Vi (pin4)= 2V, See Figure 1 -7.5 -Vcc=15V Vcc=40V --6.0 9.0 10 15 mA Test Conditions* Zero duty cycle V (pin 3)=0.7V Min -0.3 Typ 4.0 0.7 Max 4.5 -Unit V mA Remark: o All typical value except for temperature coefficient are at Ta= 25 C For conditions shown as Min or Max, use the appropriate value specified under recommended operating conditions. All typical values except for parameter changes with temperature are at Ta= 25 oC Duration of the short-circuit should not exceed one second Standard deviation is a measure of the statistical distribution about the mean as derived from the formula N ( x - x) 2 = n n =1 N - 1 1 2 Temperature coefficient of timing capacitor and timing resistor not taken into account TS494 4-7 2003/12 rev. A 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 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 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 16 1 9 B 8 DIM A B C D G J K L M L NC J K G D M TS494 7-7 2003/12 rev. A |
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