AP3790MTR-G1

A Product Line of Diodes Incorporated AP3790 TM PUMP EXPRESS COMPATIBLE AC/DC PSR CONTROLLER Description Pin Assignments The AP3790 is a high accuracy and low cost switching mode power (Top View) 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 CPC NC 8 1 (DCM). The controller uses adaptive source current to optimize OUT GND 7 driving current to reduce driving loss. The system operating frequency 2 reduces linearly from heavy load to light load in each interval of the p- FB NC 3 6 PFM, and enters constant current mode when the load current is equal to the maximum system output current. CS VCC 5 4 The output voltage of AP3790 can be adjusted based on the patterns of load current aligned to MTK Pump Express protocol. SO-8 The AP3790 provides operating frequency Jitter function from light to full load range to improve the power supply EMI performance. The Features AP3790 also has built-in fixed cable voltage drop compensation (6% of nominal system output voltage) and adjustable line voltage TM Compatible to MediaTek Pump Express Protocol compensation. Ultra-Low Standby Power Consumption Valley-turn On to Reduce Switching Loss and Benefit for EMI The AP3790 can work individually to achieve Ultra-Low standby Piece-wise Frequency Reduction to Enhance Conversion power under 5V output. Efficiency and Suppress Audio Noise 5% Constant Voltage Accuracy for 5V Output The AP3790 is packaged in SO-8. Audio Noise Suppression Open Circuit Protection (OCkP) Current Sense Resistor Short Protection Over Voltage Protection (OVP) Over Temperature Protection (OTP) Applications Short Circuit Protection (SCP) with Hiccup Totally Lead-free & Fully RoHS Compliant (Notes 1 & 2) Adapters/Chargers 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 A Product Line of Diodes Incorporated AP3790 Typical Applications Circuit FR1 L1 TR1 D1 C7 R12 R3 D4~D7 C1 C2 + + D2 + + R1 C3 C4 R4 R11 R10 5V/1A L2 D3 C5 Q1 AP3790 8 4 VCC 6 7 R13 OUT 1 3 CPC FB C6 5 CS 2 GND R14 R2 Pin Descriptions Pin Number Pin Name Function A capacitor is connected to this pin to form a low pass filter for cable voltage drop 1 CPC compensation, audio noise suppression and detecting the patterns of load current to change the output voltage and current 2 GND The ground of the controller 3 FB The CV and CC regulation are realized base on the voltage sampling of this pin VCC supply pin for the controller. A capacitor with low ESR should be placed as 4 VCC close as possible to this pin Current senses pin of IC. The CS pin will turn off the power transistor when the CS 5 CS pin voltage reaches turn off threshold. 7 OUT The OUT pin is used to drive the external power transistor 6, 8 NC Not connected 2 of 17 AP3790 October 2014 Diodes Incorporated www.diodes.com Document number: DS37221 Rev. 3 - 2 NEW PRODUCT