AP3103AKTR-G1 Diodes Incorporated

A Product Line of Diodes Incorporated AP3103A COST EFFECTIVE GREEN PWM CONTROLLER Description Pin Assignments The AP3103A is a low startup current, current mode PWM controller with green-mode power-saving operation. The PWM switching (Top View) frequency at normal operation is externally programmable and is trimmed to a tight range. The dithering of frequency will also improve Pin 1 Mark the EMI feature. When the load decreases, the frequency will reduce and when at a very low load, the IC will enter the burst mode to minimize switching loss. 6 GATE GND 1 About 20kHz frequency switching is to avoid the audible noise as well as reducing the standby loss. The skip mode point can be adjusted through the external resistor connected to the current sense resistor. VCC FB 2 5 The AP3103A features a lot of functions such as the Leading-Edge SENSE RI 3 4 Blanking (LEB) of the current sensing, internal slope compensation and several protection functions including cycle-by-cycle current limit (OCP), VCC Over Voltage Protection (VOVP) and OLP protection. SOT26 This IC is available in SOT26 package. Features Applications Very Low Start-up Current Switching AC-DC Adapter/Charger Current Mode Control ATX/BTX Auxiliary Power Non-audible-noise Green-mode Control Set-top Box(STB) Power Supply Skip Mode Adjustable Open Frame Switching Power Supply Internal Slope Compensation Soft Start During Startup Process Frequency Fold Back for High Average Efficiency Secondary Short Winding Protection with FOCP Soft Switching for Reducing EMI VCC Maintain Mode Useful Pin Fault Protection: SENSE Pin Floating RI Pin Short to Ground FB/Opto-coupler Open/Short Comprehensive System Protection Feature: VCC Over Voltage Protection (VOVP) Over Load Protection (OLP) Mini Size with Packages Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. Green Device (Note 3) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See A Product Line of Diodes Incorporated AP3103A Typical Applications Circuit L2 T1 C6 R6 C5 C2 R4 R13 C8 C7 R5 R19 C4 C3 U1 NTC R14 R8 R2 R3 VCC GATE R10 C1 R9 R15 C10 RI SENSE C11 R16 R11 R12 R17 AP3103A VR1 AZ431 C9 R7 FB GND R18 U2 Pin Descriptions Pin Number Pin Name Function 1 GND Signal ground. Current return for driver and control circuits 2 FB Feedback. Directly connected to the opto-coupler 3 RI Set the bias current to determine the normal switching frequency 4 SENSE Current Sense 5 VCC Supply voltage of driver and control circuits 6 GATE Gate driver output 2 of 12 AP3103A September 2014 Diodes Incorporated www.diodes.com Document number: DS37491 Rev. 2 - 2 F1 + ~ ~ ~ -