TL594: PWM Controller

The TL594 PWM Controller incorporates all the functions required in the construction of a pulse width modulation (PWM) control circuit on a single chip. Designed primarily for power-supply control, this device offers the systems engineer the flexibility to tailor the power-supply control circuitry to a specific application.The TL594 PWM Controller contains two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, a 5-V regulator with a precision of 1.5%, an undervoltage lockout control circuit, and output control circuitry.The error amplifiers have a common-mode voltage range of -0.3 V to VCC-2 V. The DTC comparator has a fixed offset that provides approximately 5% dead time. The on-chip oscillator can be bypassed by terminating RT to the reference output and providing a sawtooth input to CT, or it can be used to drive the common circuitry in synchronous multiple-rail power supplies.The uncommitted output transistors provide either common-emitter or emitter-follower output capability. Each device provides for push-pull or single-ended output operation, with selection by means of the output-control function. The architecture of these devices prohibits the possibility of either output being pulsed twice during push-pull operation. The undervoltage lockout control circuit locks the outputs off until the internal circuitry is operational.The TL594CD, CN, CDTB are characterized for operation from -40C to 85C.

Features
  • PWM Buck Controller Configuration
  • Variable Frequency Operation (up to 300 KHz)
  • Complete Pulse Width Modulation Control Circuitry
  • On-Chip Oscillator with Master or Slave Operation
  • On-Chip Error Amplifiers
  • On-Chip 5.0 V Reference, 1.5% Accuracy
  • Adjustable Deadtime Control
  • Uncommitted Output Transistors Rated to 500 mA Source or Sink
  • Output Control for Push-Pull or Single-Ended Operation
  • Undervoltage Lockout
  • Pb-Free Packages are Available
Benefits
  • Simple to use in buck configuration
  • Optimize system size and efficiency
Applications
  • Off-line power supply
  • Buck converter
End Products
  • VPA (Vehicle Power Adapter)
  • LED Lighting
Data Sheets (1)
Document TitleDocument ID/SizeRevisionRevision Date
PWM Control Circuit (up to 300 kHz)TL594/D (145.0kB)5
Package Drawings (3)
Document TitleDocument ID/SizeRevision
PDIP-16648-08 (34.2kB)V
SOIC 16 LEAD751B-05 (38.2kB)K
TSSOP-16948F-01 (41.7kB)B
Order Information
ProductStatusCompliancePackageMSL*ContainerBudgetary Price/Unit
TL594CDGLast ShipmentsPb-freeSOIC-16751B-051Tube48
TL594CDR2GActivePb-freeSOIC-16751B-051Tape and Reel2500$0.56
TL594CDTBGLast ShipmentsPb-free Halide freeTSSOP-16948F-011Tube96
TL594CDTBR2GActivePb-free Halide freeTSSOP-16948F-011Tape and Reel2500Contact BDTIC
TL594CNGLast ShipmentsPb-free Halide freePDIP-16648-08NATube500
Specifications
ProductTopologyPhasesControl ModeVCC Min (V)VCC Max (V)fSW Typ (kHz)tres Typ (ns)
TL594CDR2GFlyback Push-Pull Forward1Voltage Mode642Up to 300100
TL594CDTBR2GPush-Pull Forward Flyback1Voltage Mode642Up to 300100
PWM Control Circuit (up to 300 kHz) (145.0kB) TL594
SOIC 16 LEAD MC14504B
TSSOP-16 MC14504B
PDIP-16 MC10H350