TL494CN PULSE-WIDTH-MODULATION CONTROL CIRCUITS chip in electronics computer microchip
chip in electronics
,integrated components
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
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 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
DESCRIPTION
The TL494 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 flexibility to tailor the power-supply control circuitry to a specific application.
The TL494 contains two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, a 5-V, 5%-precision regulator, and output-control circuits.
The error amplifiers exhibit a common-mode voltage range from –0.3 V to VCC – 2 V. The dead-time control 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 drive the common circuits in synchronous multiple-rail power supplies.
FUNCTION TABLE
| INPUT TO OUTPUT CTRL | OUTPUT CTRL |
| VI = GND S | Single-ended or parallel output |
| VI = Vref | Normal push-pull operation |
FUNCTIONAL BLOCK DIAGRAM
STOCK LIST
| 6AM15 | 1200 | HIT | 16+ | ZIP-12 |
| AMP01FX | 1600 | AD | 15+ | DIP-18 |
| HEF4021BT | 1520 | 16+ | SOP | |
| AD8138ARZ | 2450 | AD | 15+ | SOP |
| F9209L | 1950 | FUJI | 16+ | TO-3P |
| HEF4093BT | 1520 | 15+ | SOP | |
| HV5222PJ | 2460 | SUPERTEX | 16+ | PLCC44 |
| 2SB772 | 3000 | NEC | 16+ | TO-126 |
| 3296W-1-101LF | 3000 | BOURNS | 16+ | DIP |
| 3296W-1-102LF | 3000 | BOURNS | 15+ | DIP |
| CM100DY-24A | 170 | MITSUBISH | 13+ | MODULE |
| CM150DY-24H | 170 | MITSUBISH | 16+ | MODULE |
| ATMEGA8-16AU | 2500 | ATMEL | 13+ | QFP-32 |
| BU508AF | 2100 | PHI | 15+ | TO-3P |
| IRF740B | 1500 | FSC | 16+ | TO-220 |
| BTS141 | 2100 | 16+ | TO-220 | |
| BZT03C82 | 9000 | VISHAY | 15+ | SOD-57 |
| ADM3053BRWZ | 2000 | AD | 16+ | SOP-20 |
| ADUM1251ARZ | 2000 | AD | 15+ | SOP |
| FB10R06KL4G | 250 | 15+ | MODULE | |
| AT24C256C-PU | 2300 | ATMEL | 15+ | DIP |
| ACPL-064L-500E | 2450 | AVAGO | 14+ | SOP-8 |
| 74LVX4245MTCX | 7500 | FAIRCHILD | 15+ | TSSOP |
| AD8051AR | 2450 | AD | 16+ | SOP |
| DS2501 | 5040 | DALLAS | 15+ | TO-92 |
| 74VCX163245MTDX | 7500 | FAIRCHILD | 16+ | TSSOP48 |
| 2SC3148 | 3000 | TOSHIBA | 15+ | TO-220 |
| ADM2486BRWZ | 2000 | AD | 16+ | SOP |
| IS61LV5128AL-10TLI | 2200 | ISSI | 16+ | TSOP-44 |
| ATMEGA88PA-PU | 2500 | ATMEL | 15+ | DIP-28 |
| 3296W-1-500LF | 3000 | BOURNS | 16+ | DIP |
| 3296W-1-202LF | 3000 | BOURNS | 15+ | DIP |
| 20N60C3 | 3000 | 14+ | TO-220 | |
| AN6912 | 1600 | PANASONIC | 13+ | DIP-14 |
| CA1458E | 1380 | INTERSIL | 15+ | DIP |
| 7MBR50NF060 | 500 | FUJI | 16+ | MODULE |
| AD517JH | 2450 | AD | 13+ | CAN |
| 2N6394 | 3000 | ON | 14+ | TO-220 |
| 2SA1385-Z-E1 | 3000 | NEC | 16+ | TO-252 |
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