(often labeled as GPC56 LA-J494P) is a Compal OEM motherboard used in HP Envy x360 15-ED
: Keep the low-power signal ground (for the IC and timing components) separate from the high-power ground (for the transformer and output). Connect them at a single "star" point. Decoupling i laj494p schematic better
| Pin | Name | Purpose in Circuit | |-----|------------|--------------------------------------------------| | 1 | 1IN+ | Non-inverting input of error amp 1 | | 2 | 1IN- | Inverting input of error amp 1 (often feedback) | | 3 | FEEDBACK | Common input for PWM comparator (compensation) | | 4 | DTC | Dead-time control (voltage sets max duty cycle) | | 5 | CT | Timing capacitor (sets oscillator frequency) | | 6 | RT | Timing resistor (with CT sets freq) | | 7 | GND | Ground | | 8 | C1 | Output transistor 1 collector | | 9 | E1 | Output transistor 1 emitter | | 10 | E2 | Output transistor 2 emitter | | 11 | C2 | Output transistor 2 collector | | 12 | VCC | IC supply voltage (typically 7V–40V) | | 13 | OUTPUT CTRL| Selects single-ended (high) or push-pull (low) | | 14 | REF | 5V reference output | | 15 | 2IN- | Inverting input of error amp 2 (often current limit) | | 16 | 2IN+ | Non-inverting input of error amp 2 | (often labeled as GPC56 LA-J494P) is a Compal
The IL494P has two error amplifiers. A high-quality schematic will use one for and the other for current limiting . A high-quality schematic will use one for and