Circuit Diagram — Tl494

The TL494's two error amplifiers make it perfect for building high-performance battery chargers with constant-current (CC) and constant-voltage (CV) charging stages. A good charger will first charge with a constant current until the battery reaches a set voltage, then switch to a constant voltage "float" charge.

Generates a linear sawtooth wave across the capacitor ( CTcap C sub cap T ) connected to Pin 5. The frequency is dictated by RTcap R sub cap T CTcap C sub cap T tl494 circuit diagram

: This determines the operation mode. Grounding this pin sets it to "single-ended" mode (both transistors pulse together), while connecting it to the internal 5V reference (Pin 14) enables "push-pull" mode (alternating pulses). Pin 14 (REF) The TL494's two error amplifiers make it perfect

[+12V to +24V Input] | +------+-----------------------+-------------------+ | | | | [C1] [Pin 12: VCC] [Pin 11: C2] [Pin 8: C1] (100uF) | | | | +---[R_T]---(Pin 6) +--------+----------+ [GND] | | +---[C_T]---(Pin 5) | (PWM Output Drive) | v +------+ +-----------+ | | Base (B) | [Pin 14: REF] (5V) | | | | [TIP31] (NPN Power Pass) +---[Resistor Divider]--->(Pin 2) | Collector| | | (C) | [Pin 13: OUTPUT CTRL] +-----+-----+ | | Emitter (E) [GND] | +------+--------+-----> [+5V Out] | | | [D1] [L1] [C2] (1N5822) (100uH) (470uF) | | | | +--[R_F]-+ | | | (Pin 1) Feedback | | [GND] [GND] Detailed Assembly and Design Steps: The frequency is dictated by RTcap R sub