AP3790 Datasheet, PDF (1/17 Pages) Diodes Incorporated – PUMP EXPRESSTM COMPATIBLE AC/DC PSR CONTROLLER

A Product Line of
Diodes Incorporated
AP3790
PUMP EXPRESS^TM COMPATIBLE AC/DC PSR CONTROLLER
Description
Pin Assignments
The AP3790 is a high accuracy and low cost switching mode power
supply controller to drive power bipolar transistor for 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 controller uses adaptive source current to optimize
driving current to reduce driving loss. 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 is
equal to the maximum system output current.
The output voltage of AP3790 can be adjusted based on the patterns
of load current aligned to MTK Pump Express protocol.
The AP3790 provides operating frequency Jitter function from light to
full load range to improve the power supply EMI performance. The
AP3790 also has built-in fixed cable voltage drop compensation (6%
of nominal system output voltage) and adjustable line voltage
compensation.
The AP3790 can work individually to achieve Ultra-Low standby
power under 5V output.
The AP3790 is packaged in SO-8.
Applications
 Adapters/Chargers
(Top View)
CPC ₁
GND 2
FB 3
VCC 4
8 NC
7 OUT
6 ^NC
5 CS
SO-8
Features
 Compatible to MediaTek Pump Express^TM Protocol
 Ultra-Low Standby Power Consumption
 Valley-turn On to Reduce Switching Loss and Benefit for EMI
 Piece-wise Frequency Reduction to Enhance Conversion
Efficiency and Suppress Audio Noise
 ±5% Constant Voltage Accuracy for 5V Output
 Audio Noise Suppression
 Open Circuit Protection (OCkP)
 Current Sense Resistor Short Protection
 Over Voltage Protection (OVP)
 Over Temperature Protection (OTP)
 Short Circuit Protection (SCP) with Hiccup
 Totally Lead-free & Fully RoHS Compliant (Notes 1 & 2)
 Halogen and Antimony Free. “Green” Device (Note 3)
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.
AP3790
Document number: DS37221 Rev. 3 - 2
1 of 17
www.diodes.com
October 2014
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