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UTC494 Dataheets PDF



Part Number UTC494
Manufacturers YOUWANG
Logo YOUWANG
Description VOLTAGE MODE PWM CONTROL CIRCUITS
Datasheet UTC494 DatasheetUTC494 Datasheet (PDF)

UTC494 LINEAR INTEGRATED CIRCUIT VOLTAGE MODE PWM CONTROL CIRCUITS DESCRIPTION The UTC494 incorporate 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, the device offers the systems engineer the flexibility to tailor the power supply control circuitry to its application. The UTC494 contains an error amplifier,current-limiting amplifier, an on-chip adjustable oscillator, a dead tim.

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UTC494 LINEAR INTEGRATED CIRCUIT VOLTAGE MODE PWM CONTROL CIRCUITS DESCRIPTION The UTC494 incorporate 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, the device offers the systems engineer the flexibility to tailor the power supply control circuitry to its application. The UTC494 contains an error amplifier,current-limiting amplifier, an on-chip adjustable oscillator, a dead time control com parator,pulse-steering control flip-flop,a 5volt ,1% precision supply regulator,and output control circuits. The error amplifier exhibits a common-mode Voltage range from -0.3V to VCC-2V.The current-limit amplifier exhibits a common-mode Voltage range from -0.3V to 3V with an offset Voltage of approximately 80 mV in series with the inverting input to ease circuit design requirements. The dead-time control comparator has a fixed offset that provides approximately 5% dead time when externally altered. The onchip oscillator may be bypassed by terminating RT(pin 6) to the reference output and providing a sawtooth Input to CT(pin 5),or it m ay be used to drive the common circuits in synchronous multiple-rail power supplies. The Uncommitted output transistors provide either commonem itter or em itter-follower output capability.Each device provides for push-pull or single-ended output operation,which m ay be selected through the output-control function. the architecture of these devices prohibits the possibility of either being pulsed twice during push-pull operation. DIP-16 SOP-16 FEATURES *Complete PWM Power Control Circuitry *Uncommitted Outputs for 200 mA Sink or Source Current *Output Control Selects single-Ended or Push- Pull Operation *Internal Circuitry Prohibits Double control Over Total Range *Circuit architecture Allows easy Synchron - Ization *Undervoltage Lockout ABSOLUTE MAXIMUM RATINGS (Unless otherwise noted ,all is over operating free-air temperature Range) Characteristic Symbol Supply Voltage(note 1) Vcc Amplifier Input Voltage Vi Collector Output Voltage Vo Collector Output Current Ico Continuous total dissipation at(or for below) 25 free air temperature(note 2) PD Operating Temperature Range Topr Storage Temperature Range Tstg lead Temperature 1.6mm from case for 60 sec. Tcase Value 40 Vcc+0.3 41 250 1000 0 to 70 -65 to 150 300 Unit V V V mA mW °C °C °C note1: All voltage values,except differential voltages are with respect to the network ground terminal. note 2:For operation above 25°C free-air temperature,The dissipation derates with 9.2mW/°C. YOUWANG ELECTRONICS CO.LTD 1 2010.09.26 V1.4 UTC494 BLOCK DIAGRAM LINEAR INTEGRATED CIRCUIT RECOMMENDED OPERATING CONDITIONS Characteristic Symbol Supply Voltage Amplifier Input Voltage Collector Output Voltage Collector Output Current(each Transistor) Current into feedback Timing capacitor Timing Resistor Oscillator frequency Operating free-air temperature.


ZM1325 UTC494 BZD27C3V6P


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