Description: The TL494 device 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. Features: 1.Complete PWM power-control circuitry 2.Uncommitted outputs for 200-mA sink or source current 3.Output control selects single-ended or push-pull operation 4.Internal circuitry prohibits double pulse at either output 5.Variable dead time provides control over total range 6.Internal regulator provides a stable 5-V reference supply with 5% tolerance 7.Circuit architecture allows easy synchronization Specifications: 1.Working voltage: DC 7V-40V 2.Operating frequency 500Hz-100kHz (adjustable R6) 3.Maximum output current: 250mA 4.Output voltage: DC 5V 5.Size: 26 x 23mm Applications: 1.Desktop PCs 2.Microwave ovens 3.Power supplies: AC/DC, isolated, with PFC, > 90 W 4.Server PSUs 5.Solar micro-inverters 6.Washing machines: low-end and high-end 7.Power supplies: AC/DC, isolated, No PFC, < 90 W 8.Smoke detectors 9.Solar power inverters