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IW1692
Low-Power Off-line Digital PWM Controller
1.0 Features 2.0 Description
* Primary-side feedback eliminates opto-isolators and The IW1692 is a high performance AC/DC power supply simplifies design controller which uses digital control technology to build peak current mode PWM flyback power supplies. The device * Multi-mode operation for highest overall efficiency provides high efficiency along with a number of key built-in * Built-incabledropcompensation protection features while minimizing the external component count and bill of material cost. The IW1692 removes the need * Very tight output voltage regulation for secondary feedback circuitry while achieving excellent * Noexternalloopcompensationcomponentsrequired line and load regulation. It also eliminates the need for loop compensation components while maintaining stability over * ComplieswithCEC/EPA/IECnoloadpowerconsumption all operating conditions. Pulse-by-pulse waveform analysis www..com and average efficiency regulations allowsforaloopresponsethatismuchfasterthantraditional * Built-inoutputconstant-currentcontrolwithprimary-side solutions, resulting in improved dynamic load response. The feedback built-in power limit function enables optimized transformer design in universal off-line applications and allows for a wide * Lowstart-upcurrent(10Atypical) input voltage range. * Built-insoftstart The low start-up power and PFM operation at light load * Built-inshortcircuitprotection ensure that the IW1692 is ideal for applications targeting the * AC line under/overvoltage and output overvoltage newest regulatory standards for standby power. protection * * * 40 kHz PWM switching frequency PFM operation at light load Space-saving SOT-23 package
3.0 Applications
* *
* Built-inISENSEpinshortprotection
Low power AC/DC adapter/chargers for cell phones, PDAs, digital still cameras Standby supplies for televisions, DVDs, set-top boxes andotherconsumerelectronics
L N + + + VOUT RTN
+
4 5 6
VCC ISENSE VIN
OUTPUT GND VSENSE
3 2 1
U1 IW1692
Figure 2.0.1 IW1692 Typical Application Circuit

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IW1692
Low-Power Off-line Digital PWM Controller
4.0 Pinout Description
IW1692
1 2 3
VSENSE GND OUTPUT
VIN ISENSE VCC
6 5 4
Pin # www..com
1 2 3 4 5 6
Name
VSENSE GND OUTPUT VCC ISENSE VIN
Type
Input Ground Output Input Input Input
Pin Description
Voltage sense input from the auxiliary winding. Ground connection. Gate drive output for the external power MOSFET switch. Supply voltage. Primary current sense. Used for cycle-by-cycle peak current control and limit. Senses average rectified input voltage.
5.0 Absolute Maximum Ratings
Absolute maximum ratings are the parametric 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 VCCpin Output (pin 3) VSENSEinput(pin1) ISENSEinput(pin5) VIN input (pin 6) Power dissipation at TA 25C Maximumjunctiontemperature 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 4.0 -0.3 to 18
Units
V mA V V V V mW C C C C/W V mA
PD TJ(MAX) TSTG TLEAD
400 125 -65 to 150 260 240 2,000 100
JA

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IW1692
Low-Power Off-line Digital PWM Controller
13.0 Physical Dimensions
6-Lead Small Outline Transistor Package
D Symbol
Millimeters
MIN 0.00 0.90 0.30 MAX 1.45 0.15 1.30 0.50
6
5
4
E1
1 2 3
E
A A1 A2 B C D E
www..com
e e1 A1
0.08 0.22 2.90 3.00 2.80 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
Compliant to JEDEC Standard MO-178AB Controlling dimensions are in millimeters
Figure 13.0.1. Physical dimensions, 6-lead SOT-23 package
14.0 Ordering Information
Part Number IW1692-00 IW1692-30 Mark Cxxx Dxxx Option Cable Drop Compensation, 0 mV Cable Drop Compensation, 300 mV Package SOT23-6L SOT23-6L Operating Temp. Range -40C TA 85C -40C TA 85C Description Tape & Reel1 Tape & Reel1
Note 1: Tape & Reel packing quantity is 3,000 units. Note 2: In the mark column, "xxx" represents the lot ID code. Refer to ILG-005 device marking specification for more detailed information.

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IW1692
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) 2007 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.
www..com
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.

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