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AP3785T

Primary Side Regulated Switching Mode Power Supply Controller with external OTP

Description

The AP3785T is a high performance AC/DC power supply controller for battery charger and adapter applications. It can meet less than 10mW standby power for “Super Star” charger criteria. The device uses Pulse Frequency Modulation (PFM) method to build discontinuous conduction mode (DCM) flyback power supplies.

The AP3785T 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 AP3785T is equipped with both cable drop compensation function to meet various cables with different lengths and gauges and adjustable line voltage compensation function. When AP3785T is used with AP4341 or synchronous rectifier series (for example APR343 + MOSFET, APR3415, APR34330), better under-shoot performance and higher conversion efficiency can be achieved.

The AP3785T has internal over temperature protection for itself, and also provides dedicated pin for external over temperature protection.

Application

  • Chargers
  • Adapters
  • Mobile Phones
  • PDAs
  • MP3
  • Standby and Auxiliary Power Supplies

Features

  • Primary Side Control -- simplified circuits & Cost effctive
  • 10mW No-load Input Power -- Power Saving
  • External Adjustable Line Compensation -- for tight CC
  • External Adjustable Cable Compensation -- for tight output voltage at cable end
  • Multiple PWM/PFM Control Mode -- to Improve Audio Noise and Efficiency
  • VCS Jitter -- to Reduce System EMI
  • Valley-on -- for the Higher Efficiency and Better EMI
  • Multiple Protections: -- for safety
  • Over Voltage Protection (OVP)
  • Output Short Circuit Protection (Auto-recovery)
  • Transformer Saturation Protection (TSP)
  • External Over Temperature Protection

Product Specifications

Product Parameters

VCC Max 30 V
Startup Current 0.2 µA
UVLO Threshold on/off 13/5.9 V
Operating Current 500 µA
Standby Power 10 mW
Power Rating 15 W
Cable Compensation ADJ

Related Content

Packages
SO-8

Quality & Reliability

Technical Documents

Recommended Soldering Techniques
Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
AP3785TEV1 Digi-Key Electronics 3 8/24/2019 Buy Now United States
AP3785TMTR-G1 Digi-Key Electronics 3629 8/24/2019 Buy Now United States
AP3785TMTR-G1 Mouser Electronics Inc. 3990 8/24/2019 Buy Now United States