G5177
Overview
The G5177 is a high performance AC/DC power supply controller which uses digital control technology to build peak current mode PWM flyback power supplies. The device directly drives a power BJT and operates in quasi-resonant mode to provide high efficiency along with a number of key built-in protection features while minimizing the external component count, simplifying EMI design and lowering the total bill of material cost.
- Very tight constant voltage and constant current regulation over entire operating range
- No-load power consumption < 20mW at 230Vac with typical application circuit
- Fast dynamic load response for both one-time and repetitive load transients
- Optimized 72 kHz maximum PWM switching frequency achieves best size and efficiency
- Primary-side feedback eliminates opto-isolators and simplifies design
- Low supply current during normal operation（typically 0.4mA without load）
- Good EMI des
