PRIMARY SIDE REGULATED SWITCHING MODE POWER SUPPLY CONTROLLER
The AP3783R is a high frequency, high efficiency and high accuracy
switching mode power supply controller to drive power MOSFET for
5V/2A battery charger/adapter applications. The controller regulates
the output voltage and current in the primary side by piece-wise Pulse
Frequency Modulation (p-PFM) in discontinuous conduction mode
(DCM). The system operating frequency reduces linearly from heavy
load to light load in each interval of the p-PFM, and enters constant
current mode when the load current equals to the maximum system
The AP3783R provides accurate constant voltage (CV), constant
current (CC) and outstanding dynamic performance without requiring
an opto-coupler. It also eliminates the need of loop compensation
circuitry while maintaining stability.
The AP3783R provides valley turn-on function and 3-Segment drive
current to improve the power supply EMI performance. The AP3783R
also has built-in fixed cable voltage drop compensation (8%, 4% and
2% of nominal system output voltage to meet various cables with
different length and gauge) and adjustable line voltage compensation.
The AP3783R achieves excellent regulation and high average
efficiency, less than 2s startup time for 30mW standby power solution.
When AP3783R is used with APR3415, good undershoot and
efficiency performances can be achieved.
The AP3783R is packaged in SOT26.
Standby and Auxiliary Power Supplies
Pin 1 Mark
Less than 30mW Standby Power Consumption
Meet Efficiency Requirement of COC Trier2
Valley Turn-on to Reduce Switching Loss and Improve EMI
Piece-wise Frequency Reduction to Enhance Conversion
Efficiency and Suppress Audio Noise
Over Voltage Protection (OVP)
Over Temperature Protection (OTP)
Short Circuit Protection (SCP) with Hiccup
3-Segment Drive Current for Radiative EMI Suppression
Operating Frequency Jitter Function for Conductive EMI
Drive MOSFET for 5W to 20W Battery Charger/Adapter
SOT26 SMD Package Comply with Level 3 of IPC/JEDEC J-STD-
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
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: DS37448 Rev. 5 - 2
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