Описание
The iW1760B 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 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. The iW1760B removes the need for secondary feedback circuit while achieving excellent line and load regulation. It also eliminates the need for loop compensation components while maintaining stability over all operating conditions. Pulse-by-pulse waveform analysis allows for a loop response that is much faster than traditional solutions, resulting in improved dynamic load response. The built-in power limit function enables optimized transformer design in universal off-line applications and allows for a wide input voltage range.
- No-load power consumption < 50mW at 230VAC along with fast dynamic load response and short turn-on delay in typical 20W and above adapter applications
- Primary-side feedback eliminates opto-isolators and simplifies design
- Adaptively controlled soft-start enables fast and smooth start-up for a wide range of capacitive loads (from 330µF to 6,000µF) with output voltage of 12V and above
- Tight constant-voltage regulation across line and load range
- Intelligent low power management achieves ultra-low operating current (250µA) at no-load
- Proprietary optimized 79kHz maximum PWM switching frequency with quasi-resonant operation achieves best size, efficiency and common mode noise
- User-configurable 5-level cable drop compensation
- EZ-EMI® design enhances manufacturability
- Adaptive multi-mode PWM/PFM control improves efficiency
- Built-in single-point fault protections against output short-circuit, output over-voltage and output over-current
- Dedicated pins for external over-temperature protection and over-voltage protection, with latch function available
- Tight constant current control enables output current limit and over-load protection
- On-chip internal over-temperature protection
- No audible noise over entire operating range
