AP3103A Datasheet, PDF (1/12 Pages) Diodes Incorporated – COST EFFECTIVE GREEN PWM CONTROLLER

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Diodes Incorporated
AP3103A
COST EFFECTIVE GREEN PWM CONTROLLER
Description
The AP3103A is a low startup current, current mode PWM controller
with green-mode power-saving operation. The PWM switching
frequency at normal operation is externally programmable and is
trimmed to a tight range. The dithering of frequency will also improve
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.
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.
Pin Assignments
(Top View)
Pin 1 Mark
GND 1
FB 2
The AP3103A features a lot of functions such as the Leading-Edge
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.
This IC is available in SOT26 package.
RI 3
SOT26
6 GATE
5 VCC
4 ^SENSE
Features
 Very Low Start-up Current
 Current Mode Control
 Non-audible-noise Green-mode Control
 Skip Mode Adjustable
 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)
Applications
 Switching AC-DC Adapter/Charger
 ATX/BTX Auxiliary Power
 Set-top Box(STB) Power Supply
 Open Frame Switching Power Supply
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated‟s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
AP3103A
Document number: DS37491 Rev. 2 - 2
1 of 12
www.diodes.com
September 2014
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