I Laj494p Schematic Better Hot!

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: Use a high-precision resistor divider connected to the 5V Reference (Pin 14) to set your target voltage. Avoid using the Vcc line directly as it may fluctuate. 2. Optimize the Timing Components (Oscillator) The switching frequency is determined by the resistor ( cap R sub t on Pin 6) and capacitor ( cap C sub t on Pin 5). Frequency Formula (for single-ended) or

• Better approach: Use Op-Amp 1 for voltage regulation and Op-Amp 2 for current limiting.
• The upgrade: Add a Type 2 compensation network (a resistor and capacitor in series across the output of the error amp). For the LAJ494P, a 10k resistor with a 100nF capacitor kills high-frequency oscillation.

• Oscillator section – Pins 5, 6, and 7. Frequency = ( 1.1 / (R_T \times C_T) ).
• Error amplifier configuration – Pins 1–3 and 15–16. Resistor networks set voltage regulation and current limiting.
• Dead-time control – Pin 4. Often a voltage divider to set maximum duty cycle (e.g., 48% for push-pull).
• Output stage – Pins 8–11. In push-pull mode, two transistors drive a transformer; in single-ended, both are paralleled.
• Feedback loop – From output voltage (via optocoupler or resistor divider) to pin 1 or 2.
• Soft-start – Capacitor from pin 4 to GND (sometimes with a resistor to REF).