A Product Line of
COST EFFECTIVE GREEN PWM CONTROLLER
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 1 Mark
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.
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
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)
Switching AC-DC Adapter/Charger
ATX/BTX Auxiliary Power
Set-top Box(STB) Power Supply
Open Frame Switching Power Supply
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"
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.
Document number: DS37491 Rev. 2 - 2
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