AP3105/V/L/R

Document number: DS36927 Rev. 2 - 2

1 of 13

www.diodes.com

February 2014

© Diodes Incorporated

AP3105/V/L/R

A Product Line of

Diodes Incorporated

COST EFFECTIVE GREEN PWM CONTROLLER

Description

The AP3105/V/L/R is a low startup current, current mode PWM

controller with green-mode power-saving operation. The PWM

switching frequency at normal operation is set with 65kHz typically

and 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.

The AP3105/V/L/R 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), OTP

and OLP protection. The versatile latch function can be set by the

customer through few components.

This IC is available in SOT-23-6 package.

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



Latch Function for OTP/OVP



Useful Pin Fault Protection:

SENSE Pin Floating

CTRL 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



Pin to Pin Compatible with AP3103

Pin Assignments

(Top View)

SOT-23-6 (K Package)

Applications



Switching AC-DC Adapter/Charger



ATX/BTX Auxiliary Power



Set-top Box(STB) Power Supply



Open Frame Switching Power Supply

1

2

3

4

5

Pin 1 Mark

6

GND

FB

CTRL

GATE

VCC

SENSE