COST EFFECTIVE GREEN PWM CONTROLLER AP3105/V/L/R
Data Sheet
1
Nov. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
General 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 theþburst modeÿ
to minimize switching loss.
About 20kHz frequency switching is to avoid the audi-
ble noise as well as reducing the standby loss. The skip
mode point can be adjusted through the external resis-
tor 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 sens-
ing, 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
g Very Low Start-up Current
g Current Mode Control
g Non-audible-noise Green-mode Control
g Skip Mode Adjustable
g Internal Slope Compensation
g Soft Start During Startup Process
g Frequency Fold Back for High Average Effi-
ciency
g Secondary Short Winding Protection with FOCP
g Soft Switching for Reducing EMI
g VCC Maintain Mode
g Latch Function for OTP/OVP
g Useful Pin Fault Protection:
SENSE Pin Floating
CTRL Pin Short to Ground
FB/Opto-coupler Open/Short
g Comprehensive System Protection Feature:
VCC Over Voltage Protection (VOVP)
Over Load Protection (OLP)
g Mini Size with Packages
g Pin to Pin Compatible with AP3103
Applications
g Switching AC-DC Adapter/Charger
g ATX/BTX Auxiliary Power
g Set-top Box(STB) Power Supply
g Open Frame Switching Power Supply
Figure 1. Package Type of AP3105/V/L/R
SOT-23-6
