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| www..com IW1688 Low-Power Off-line Digital PWM Controller 1.0 Features * * * * * * * * * * * Primary-side feedback eliminates opto-isolators and simplifies design Multi-mode operation for highest overall efficiency 4% typical output voltage regulation No external compensation components required Complies with CEC/EPA no load power consumption and average efficiency regulations Built-in output constant-current control with foldback Low start-up current (8 A typical) Built-in soft start Built-in short circuit protection AC line under/overvoltage and output overvoltage protection Fixed 40 kHz switching frequency 2.0 Description The IW1688 is a high performance power supply controller which uses digital control technology to build sensorless peak current mode PWM flyback power supplies. The device provides high efficiency along with a number of key built-in protection features while minimizing the external component count and bill of material cost. The IW1688 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 over all operating conditions. Pulse-by-pulse waveform analysis allows for a loop response that is typically much faster than traditional solutions, resulting in significantly better 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 IW1688 is ideal for applications targeting the newest Agency standards for average efficiency and standby power. 3.0 Applications DataShee * Low .com power AC/DC adapter/chargers for cell phones, PDAs, digital still cameras - (up to 20W) * Standby supplies for televisions, DVDs, set-top boxes and other consumer electronics L N + + + + +5V RTN + 4 VCC OUTPUT GND 3 2 1 5 VIN VSENSE U1 IW1688 .com Figure 2.0.1 IW1688 Typical Application Circuit MK-4004-NR 04/03/06 PAGE 1 .com DataSheet 4 U .com www..com IW1688 Low-Power Off-line Digital PWM Controller 4.0 Pinout Description IW1688 1 2 3 VSENSE GND OUTPUT VIN 5 VCC 4 Pin # 1 2 3 4 5 Name VSENSE GND OUTPUT VCC VIN Type Input Ground Output Input Input Pin Description Voltage sense input from the auxiliary winding. Analog signal and power ground connection. Gate drive output for the external power MOSFET switch. Supply voltage. Average AC line voltage sense, rectified and attenuated. This pin also serves as the supply for the IC during start-up. t4U.com DataShee 5.0 Absolute Maximum Ratings .com Absolute maximum ratings are the parameteic values or ranges which can cause permanent damage if exceeded. For maximum safe operating conditions, refer to Electrical Characteristics in Section 6.0. Parameter DC supply voltage range (pin 4, ICC = 20mA max) DC supply current at VCC pin Low voltage output (pin 3) VSENSE input (pin 1) VIN input (pin 5) Power dissipation at TA 25C Maximum junction temperature Storage temperature Lead temperature during IR reflow for 15 seconds Thermal Resistance Junction-to-Ambient ESD rating per JEDEC JESD22-A114 (HBM) Latch-Up test per JEDEC 78 Symbol VCC ICC Value -0.3 to 18 20 -0.3 to 18 -0.3 to 4.0 -0.3 to 18 Units V mA V V V mW C C C C/W V mA PD TJ MAX TSTG TLEAD 526 125 -65 to 150 260 190 2,000 100 JA .com MK-4004-NR 04/03/06 PAGE 2 .com DataSheet 4 U .com www..com IW1688 Low-Power Off-line Digital PWM Controller 12.0 Physical Dimensions 5-Lead Small Outline Transistor Package D Symbol Millimeters MIN 0.00 0.90 0.30 0.08 MAX 1.45 0.15 1.30 0.50 0.22 5 4 E1 1 2 3 E A A1 A2 B C D E e e1 A1 2.90 BSC 2.80 BSC 1.65 BSC 0.95 BSC 1.90 BSC 0.30 0 0.60 8 A2 A L C E1 e e1 L B COPLANARITY 0.10 SEATING PLANE t4U.com JEDEC Registered Outline: Drawing # MO-178, Variation AA Controlling dimensions are in millimeters DataShee .com Figure 12.0.1. Physical dimensions, 5-lead SOT-23 package 13.0 Ordering Information Part Number IW1688-05ST-TR Package SOT-23-5 Operating Temp. Range -40C TA 85C Description IW1688 PWM Controller -Tape & Reel1 Note 1: Tape & Reel packing quantity is 3,000 units. .com MK-4004-NR 04/03/06 PAGE 16 .com DataSheet 4 U .com www..com IW1688 Low-Power Off-line Digital PWM Controller About iWatt iWatt Inc. is a fabless semiconductor company that develops intelligent power management ICs for computer, communication, and consumer markets. The company's patented pulseTrainTM technology, the industry's first truly digital approach to power system regulation, is revolutionizing power supply design. Trademark Information (c) 2005 iWatt, Inc. All rights reserved. iWatt, the iW light bulb, and pulseTrain are trademarks of iWatt, Inc. All other trademarks and registered trademarks are the property of their respective companies. Contact Information Web: http://www.iwatt.com E-mail: info@iwatt.com Phone: 408-374-4200 Fax: 408-341-0455 iWatt Inc. 101 Albright Way Los Gatos CA 95032-1827 Disclaimer iWatt reserves the right to make changes to its products and to discontinue products without notice. The applications t4U.com information, schematic diagrams, and other reference information included herein is provided as a design aid only and are therefore provided as-is. iWatt makes no warranties with respect to this information and disclaims any implied warranties of .com merchantability or non-infringement of third-party intellectual property rights. Certain applications using semiconductor products may involve potential risks of death, personal injury, or severe property or environmental damage ("Critical Applications"). IWATT SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED, OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT APPLICATIONS, DEVICES OR SYSTEMS, OR OTHER CRITICAL APPLICATIONS. Inclusion of iWatt products in critical applications is understood to be fully at the risk of the customer. Questions concerning potential risk applications should be directed to iWatt, Inc. iWatt semiconductors are typically used in power supplies in which high voltages are present during operation. High-voltage safety precautions should be observed in design and operation to minimize the chance of injury. .com MK-4004-NR 04/03/06 PAGE 20 .com DataSheet 4 U .com |
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