IW1700-00

iW1700 Product Brief Zero Power No-Load Off-Line Digital PWM Controller 1.0 Features Intelligent AC-DC and LED Power™ 2.0 Description ● Zero power consumption at no-load with lowest system cost (< 5 mW at 230 Vac with typical application circuit) ● Intelligent low power management achieves ultra-low operating current at no-load ● Adaptive load transient detection and fast response ● Very tight constant voltage and constant current regulation over entire operating range ● Primary-side feedback eliminates opto-isolators and simplifies design ● EZ-EMI ® design enhances manufacturability ● Intrinsically low common mode noise ● Optimized 72 kHz maximum PWM switching frequency achieves best size and efficiency ● Active start-up scheme enables fastest possible start-up ● Adaptive multi-mode PWM/PFM control improves efficiency ● Quasi-resonant operation for highest overall efficiency ● Direct drive of low-cost BJT switch ● No external compensation components required ● Complies with EPA 2.0 energy-efficiency specifications with ample margin ● Built-in soft start ● Built-in short circuit protection and output overvoltage protection The iW1700 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 together with an external active device (depletion mode NFET or NPN BJT) provides a fast start-up meanwhile achieving ultra-low no-load power consumption. 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 iW1700 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 much faster than traditional solutions, resulting in improved dynamic load response, for both one-time and repetitive load transient. The built-in power limit function enables 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 iW1700 can achieve both highest average efficiency and zero no-load power consumption, and have fast load transient response in a compact form factor. The active start-up scheme enables shortest possible start-up time without sacrificing no-load power loss. 3.0 Applications ● Built-in current sense resistor short circuit protection ● Compact AC/DC adapter/chargers for cell phones, PDAs, digital still cameras ● No audible noise over entire operating range ● Linear AC/DC replacement L + VOUT + GND N U1 iW1700 1 VCC 2 VSENSE 3 ASU OUTPUT 6 GND 5 ISENSE 4 Figure 3.1: iW1700 Typical Application Circuit (Achieving < 5 mW No-load Power Consumption. Using Depletion Mode NFET as the Active Start-up Device) REV. 0.1 Preliminary iW1700 February 1, 2011 PAGE 1 iW1700 Product Brief Zero Power No-Load Off-Line Digital PWM Controller Intelligent AC-DC and LED Power™ L + VOUT + GND N U1 iW1700 1 VCC 2 VSENSE 3 ASU OUTPUT 6 GND 5 ISENSE 4 Figure 3.2: iW1700 Typical Application Circuit (Alternative Circuit Using NPN BJT as the Active Start-up Device) 4.0 Pinout Description iW1700 1 VCC 2 VSENSE 3 ASU OUTPUT 6 GND 5 ISENSE 4 Figure 4.1: 6 Lead SOT-23 Package Pin # Name Type 1 VCC Power Input 2 VSENSE 3 ASU 4 ISENSE 5 GND Ground Ground. 6 OUTPUT Output Base drive for BJT. REV. 0.1 Preliminary Pin Description Power supply for control logic. Analog Input Auxiliary voltage sense (used for primary regulation). Output Control signal for active start-up device (BJT or depletion NFET). Analog Input Primary current sense. Used for cycle-by-cycle peak current control and limit. iW1700 February 1, 2011 PAGE 2 iW1700 Product Brief Zero Power No-Load Off-Line Digital PWM Controller Intelligent AC-DC and LED Power™ 5.0 Absolute Maximum Ratings Absolute maximum ratings are the parameter values or ranges which can cause permanent damage if exceeded. Parameter Symbol Value Units VCC -0.3 to 18 V ICC 20 mA ASU output (pin 3) -0.3 to 18 V Output (pin 6) -0.3 to 4.0 V VSENSE input (pin 2, IVsense ≤ 10 mA) -0.7 to 4.0 V ISENSE input (pin 4) -0.3 to 4.0 V TJ MAX 125 °C Storage temperature TSTG –65 to 150 °C Lead temperature during IR reflow for ≤ 15 seconds TLEAD 260 °C θJA 190 °C/W ESD rating per JEDEC JESD22-A114 2,000 V Latch-up test per JEDEC 78 ±100 mA DC supply voltage range (pin 1, ICC = 20mA max) Continuous DC supply current at VCC pin (VCC = 15 V) Maximum junction temperature Thermal resistance junction-to-ambient REV. 0.1 Preliminary iW1700 February 1, 2011 PAGE 3 iW1700 Product Brief Zero Power No-Load Off-Line Digital PWM Controller Intelligent AC-DC and LED Power™ 6.0 Physical Dimensions 6-Lead SOT Package 5 6 4 E E1 1 2 3 e e1 A1 A2 B A SEATING PLANE COPLANARITY 0.10  Symbol D MIN A - 1.45 A1 0.00 0.15 A2 0.90 1.30 B 0.30 0.50 C D 0.08 0.22 2.90 BSC 2.80 3.00 C MAX E 2.80 BSC E1 1.60 BSC e 0.95 BSC e1 L Millimeters 1.90 BSC L 0.30 0.60  0° 8° Figure 6.1 : Physical dimensions, 6-lead SOT-23 package Compliant to JEDEC Standard MO-178AB Controlling dimensions are in millimeters This package is RoHS compliant and Halide free. Soldering Temperature Resistance: [a] Package is IPC/JEDEC Std 020D Moisture Sensitivity Level 1 [b] Package exceeds JEDEC Std No. 22-A111 for Solder Immersion Resistance; packages can withstand 10 s immersion < 270ºC Dimension D does not include mold flash, protrusions or gate burrs. Mold flash, protrusions or gate burrs shall not exceed 0.25 mm per side. D and E1 dimensions are determined at datum H. The package top may be smaller than the package bottom. Dimensions D and E1 are are determined at the outermost extremes of the plastic body exclusive of mold flash, tie bar burrs and interlead flash, but including any mismatch between top and bottom of the plastic body. D and E1 dimensions are determined at datum H. 7.0 Ordering Information Part Number Options Package Description iW1700-00 Cable Comp = 0 mV SOT-23 Tape & Reel1 iW1700-01 Cable Comp = 300 mV SOT-23 Tape & Reel1 Note 1: Tape & Reel packing quantity is 3,000 per reel. Minimum ordering quantity is 3,000. REV. 0.1 Preliminary iW1700 February 1, 2011 PAGE 4 iW1700 Product Brief Zero Power No-Load Off-Line Digital PWM Controller Intelligent AC-DC and LED Power™ 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 pulseTrain™ technology, the industry’s first truly digital approach to power system regulation, is revolutionizing power supply design. Trademark Information © 2009 iWatt, Inc. All rights reserved. iWatt, EZ-EMI 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 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 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. REV. 0.1 Preliminary iW1700 February 1, 2011 PAGE 5