Dialog Semiconductor iW1699

Description

The iW1699 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 featureswhile minimizing the external component count, simplifying EMI design and lowering the total bill of material cost. The iW1699 removes the need for secondary feedback circuit while achieving excellent line and load regulation. It also eliminates the need for loop compensation componentswhile 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 for both one-time and repetitive load transients. The built-in power limit functionenables optimized transformer design in universal off-line applications and allows for a wide input voltage range.

iWatt’s innovative proprietary technology ensures that power supplies built with the iW1699 can achieve both highest average active efficiency and less than 30mW no-load power consumption, and have fast dynamic loadresponse in a compact form factor in typical 12W and above applications. The active start-up scheme ena bles shortest possible start-up time without sacrificing no-load power loss.

Features

• No-load power consumption < 30mW at 230VAC along with fast dynamic load response and short turn-on delay time in typical 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
• 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 flexibility
• EZ-EMI® design enhances manufacturability
• Adaptive multi-mode PWM/PFM control improves efficiency
• No external loop compensation components required
• Complies with EPA 2.0 energy-efficiency specifications with ample margin
• Built-in single-point fault protection features: output short-circuit protection, output over-voltage protection,over-current protection and current-sense-resistor fault protection
• Dedicated pins for external over-temperature protection and over-voltage protection, with latch function available
• No audible noise over entire operating range

Typical applications

• Consumer Electronics Power Supplies
• Power Adapters for Portable Electronics
• Linear AC/DC Power Supply Replacement

More information

• Datasheet
• IC product information