3845GMTR

Data Sheet GREEN MODE PWM CONTROLLER General Description The AP384XG is a Green Mode PWM controller. It is specially designed for off-line AC-DC adapter and battery charger applications where both needs for low standby power and high efficiency in normal operation are required. In a well designed product, the AP384XG is capable to allow the system consuming only 0.5W power in standby mode. In normal operation, the AP384XG features adjustable frequency by using an external resistor and capacitor combination. When output power falls below a given level, the IC automatically switches to the skip mode, which works by skipping switching cycles. The AP384XG also features low start-up and low standby operating current for its special topology. The AP384XG provides accurate protection against over-temperature, over-current and maximal output power. The AP384XG is available in SOIC-8 and DIP-8 packages. AP384XG Features · · · · · · · · · · Green Mode PWM Controller to Support the "Blue Angel" Norm Adjustable Skip Cycle Mode Operation Low Start-up Current: 50µA (Typ.) Low Standby Operating Current: 6mA Internal Leading Edge Blanking Adjustable Oscillator Frequency up to 500KHz Totem Pole Output Under Voltage Lock Out (UVLO) Over-Temperature Protection Pin to Pin Replacement for AZ384XA Applications · · · · · Off-line Converter DC-DC Converter DVD/STB Power Supply Power Adapter CRT Monitor Power Supply SOIC-8 DIP-8 Figure 1. Package Types of AP384XG Aug. 2005 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 1 Data Sheet GREEN MODE PWM CONTROLLER Pin Configuration P/M Package (DIP-8/SOIC-8) COMP FB CS RT/CT 1 2 3 4 8 7 6 5 REF VCC OUTPUT GND AP384XG Figure 2. Pin Configuration of AP384XG Pin Description Pin Number 1 2 3 4 5 6 7 8 Pin Name COMP FB CS RT/CT GND OUTPUT VCC REF Function This pin is the Error Amplifier output and is made available for loop compensation. The inverting input of the Error Amplifier. It is normally connected to the switching power supply output through an external resistor divider. It is used either for current sense (normal mode) or skip cycle level selection (standby mode). The oscillator frequency and maximum output duty cycle are programmed by connecting resistor RT to REF and capacitor CT to ground. The ground pin. This output directly drives the gate of a power MOSFET. Peak currents up to 1.0 A are sourced and sunk by this pin. The power supply pin. This is the reference output. It provides charging current for capacitor CT through resistor RT. Aug. 2005 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 2 Data Sheet GREEN MODE PWM CONTROLLER Functional Block Diagram VCC 7 34V UVLO S/R 5V REF AP384XG 8 GND 5 2.50V REF INTERNAL BIAS RT/CT 4 VREF GOOD LOGIC OSC OVER TEMP PROTECT S ERROR AMP 2R R R 1V Q Q 6 OUTPUT FB COMP CS 2 1 3 PWM CURRENT LATCH SENSE COMPARATOR Figure 3. Functional Block Diagram of AP384XG Ordering Information AP384XG Circuit Type Package M: SOIC-8 P: DIP-8 E1: Lead Free Blank: Tin Lead TR: Tape and Reel Blank: Tube Package SOIC-8 DIP-8 Temperature Range -40 to 85oC -40 to 85oC Part Number Tin Lead AP3842/3/4/5GM Marking ID Tin Lead 3842/3/4/5GM 3842/3/4/5GM AP3842/3/4/5GP Lead Free AP3842/3/4/5GM-E1 Lead Free 3842/3/4/5GM-E1 3842/3/4/5GM-E1 AP3842/3/4/5GP-E1 Packing Type Tube Tape & Reel Tube AP3842/3/4/5GMTR AP3842/3/4/5GMTR-E1 AP3842/3/4/5GP AP3842/3/4/5GP-E1 BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant. Aug. 2005 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 3 Data Sheet GREEN MODE PWM CONTROLLER Absolute Maximum Ratings (Note 1, 2) Parameter Supply Voltage Gate Output Current Analog Inputs (pin2, 3) Error Amp Output Sink Current Power Dissipation at TA< 25 oC (DIP-8) Power Dissipation at TA