The TL494IDR device incorporates all the functio關討ns required in the constructi哥銀on of a pulse-width-modu愛北lation (PWM) control circuit on a s樂船ingle chip. Designed p子這rimarily for power-supply co懂個ntrol, this device of匠火fers the flexibility to 女影tailor the power-suppl場通y control circuitry to a specific ap唱鄉plication.

The TL494IDR device contains two error amplifiers,年體 an on-chip adjustable os遠爸cillator, a dead-time control (DTC) c分日omparator, a pulse-steering con外紙trol flip-flop, a 5-V, 5%-p為水recision regulator, and ou理不tput-control circuits.

The error amplifiers exhibit a commo腦做n-mode voltage range from –0.3 司謝V to VCC – 2 V. The dead-time control c身知omparator has a fixed offset that p購什rovides approximately我輛 5% dead time. The on-chip oscillat也關or can be bypassed by terminating R相懂T to the reference output靜新 and providing a sawt好火ooth input to CT, or it can drive the c男身ommon circuits in synchr我上onous multiple-rail power s東答upplies.

The uncommitted output河要 transistors provide請事 either common-emitter or emitter-f拿間ollower output capability.自購 The TL494 device provides for 區校push-pull or single-ended output operat開劇ion, which can be selected through大醫 the output-control fu來要nction. The architecture of this devi得間ce prohibits the possibility o美爸f either output being pulsed twic上近e during push-pull operation.

The TL494C device is鐘金 characterized for oper請船ation from 0°C to 70°C. The TL494IDR device is characterized for票技 operation from –40°C t答廠o 85°C.