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IW1696 Datasheet(PDF) 5 Page - Dialog Semiconductor |
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IW1696 Datasheet(HTML) 5 Page - Dialog Semiconductor |
5 / 11 page iW1696 Low-Power Off-line Digital Green-Mode PWM Controller Rev. 2.0 iW1696 Page 5 FebRuaRy 13, 2012 8.0 Functional Block Diagram 1 5 2 4 GND Output Start-up Digital Logic Control Signal Conditioning DAC 1.1 V BJT Base Drive Enable 3 OCP = 1.538 V VCC VFB VSENSE(NOM) VSENSE ISENSE VIPK IPK Figure 8.1: iW1696 Functional Block Diagram 9.0 Theory of Operation The iW1696 is a digital controller which uses a new, proprietary primary-side control technology to eliminate the opto-isolated feedback and secondary regulation circuits required in traditional designs. This results in a low-cost solution for low power AC/DC adapters. The core PWM processor uses fixed-frequency Discontinuous Conduction Mode (DCM) operation at higher power levels and switches to variable frequency operation at light loads to maximize efficiency. Furthermore, iWatt’s digital control technology enables fast dynamic response, tight output regulation, and full featured circuit protection with primary-side control. Referring to the block diagram in Figure 8.1, the digital logic control block generates the switching on-time and off-time information based on the output voltage and current feedback signal and provides commands to dynamically control the external BJT base current. The system loop is automatically compensated internally by a digital error amplifier. Adequate system phase margin and gain margin are guaranteed by design and no external analog components are required for loop compensation. The iW1696 uses an advanced digital control algorithm to reduce system design time and increase reliability. Furthermore, accurate secondary constant-current operation is achieved without the need for any secondary-side sense and control circuits. The iW1696 uses adaptive multi-mode PWM/PFM control to dynamically change the BJT switching frequency for efficiency, EMI, and power consumption optimization. In addition, it achieves unique BJT quasi-resonant switching to further improve efficiency and reduce EMI. Built-in protection features include overvoltage protection (OVP), output short circuit protection (SCP), over current protection (OCP), single pin fault protection and I SENSE fault detection. iWatt’s digital control scheme is specifically designed to address the challenges and trade-offs of power conversion design. This innovative technology is ideal for balancing new regulatory requirements for green mode operation with more practical design considerations such as lowest possible cost, smallest size and high performance output control. |
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