Описание
The iW1699B 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 iW1699B 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 < 30mW at 230VAC along with fast dynamic load response and short turn-on delay in typical 5V2.4A 12W compact adapter/charger applications
- Tight constant-voltage and constant current regulation across line and load range
- Primary-side feedback eliminates opto-isolators and simplifies design
- Intelligent low power management achieves ultra-low operating current 250µA at no-load
- Proprietary optimized 89kHz maximum PWM switching frequency with quasi-resonant operation achieves best size efficiency and common mode noise
- User-configurable 5-level cable drop compensation provides design Àexibility
- EZ-EMI® design enhances manufacturability
- Adaptive multi-mode PWM/PFM control improves efficiency
- Complies with (PA 2.0 energy-efficiency specifications with ample margin
- 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
- On-chip internal over-temperature protection
- No audible noise over entire operating range
