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PJ494CS Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers |
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PJ494CS Datasheet(HTML) 1 Page - List of Unclassifed Manufacturers |
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1 / 11 page  PJ494 Switchmode Pulse Width Modulation Control Circuit 1-11 2002/11.rev.A DIP-16 SOP-16 he PJ494 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 PJ494 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 –0.3 volts to Vcc –2 volts. 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 uncommited 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. • 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, 5% • Circuit Architecture Allows Easy Synchronization (unless otherwise noted) T Device OperatingTemperature (Ambient) Package PJ494CD DIP-16 PJ494CS -20℃ to +85℃ SOP-16 Rating Symbol Value Unit Supply voltage Vcc 41 Amplifier input voltage Vi Vcc+0.3 Collector output voltage Vo 41 V Collector output current 250 mA Operating free-air temperature range -20 to 85 Storage temperature range Tstg -25 to 125 Operating Junction Temperature TJ 125 Lead temperature 1,6mm from case for 10 seconds 260 ℃ Power Dissipation @TA≦45℃ PD 1000 mW FEATURES ORDERING INFORMATION Pin 1.Noninv Input 2.Inv Input 3.Feedback 4.Dead-Time Control 5.CT 6.RT 7.Gnd 8.C1 9.E1 10.E2 11.C2 12.Vcc 13.Output Control 14.Ref Out 15. Inv Input 16. Noninv Input ABSOLUTE MAXIMUM RATINGS OVER OPERATING FREE-AIR TEMPERATURE RANGE ﹜Error Amp2 ﹜Error Amp1 |
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