improvements might include:
The I-LAJ494P is a common PWM controller found in ATX power supplies and DC-to-DC converters. While many generic schematics exist, finding a "better" version usually means looking for one with clearer annotations, protection circuits, and stable feedback loops. The Architecture of the I-LAJ494P
the fraction with numerator 0.5 and denominator cap R sub t center dot cap C sub t end-fraction (for push-pull). Component Quality low-ESR, temperature-stable film capacitor cap C sub t to prevent frequency drift as the power supply heats up. 3. Implement Proper Dead-Time Control
Check for 19V at the DC-in jack and the first two MOSFETs.