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IW1696 Datasheet(PDF) 1 Page - Dialog Semiconductor |
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IW1696 Datasheet(HTML) 1 Page - Dialog Semiconductor |
1 / 11 page iW1696 Low-Power Off-line Digital Green-Mode PWM Controller Rev. 2.0 iW1696 Page 1 FebRuaRy 13, 2012 1.0 Features ● Primary-side feedback eliminates opto-isolators and simplifies design ● Adaptive multi-mode PWM/PFM control improves efficiency ● Quasi-resonant operation for highest overall efficiency ● EZ-EMI ® design to easily meet global EMI standards ● Direct drive of low-cost BJT switch ● Dynamic base current control ● Very tight constant voltage and constant current regulation with primary-side-only feedback ● No external compensation components required ● Complies with EPA 2.0 energy-efficiency specifications with ample margin ● Able to meet < 30 mW no load power consumption ● Low start-up current (10 μA typical) ● Built-in soft start ● Built-in short circuit protection and output overvoltage protection ● Built-in current sense resistor short protection ● No audible noise over entire operation range Figure 3.1: iW1696 Typical Application Circuit 2.0 Description The iW1696 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. The iW1696 removes the need for secondary feedback circuitry while achieving excellent line and load regulation. It also eliminates the need for loop compensation components while maintaining stability overall 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. The ultra-low start-up power and operating current at light load ensure that the iW1696 is ideal for applications targeting the newest regulatory standards for average efficiency. 3.0 Applications ● Low power AC/DC adapter/chargers for cell phones, PDAs, digital still cameras ● Linear AC/DC replacement L + VOUT GND U1 iW1696 VCC GND VSENSE OUTPUT ISENSE 1 2 5 4 3 N + |
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