AZ384XGP

Preliminary Datasheet 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: 40µA (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 BCD Semiconductor Manufacturing Limited Preliminary Datasheet 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. BCD Semiconductor Manufacturing Limited Preliminary Datasheet GREEN MODE PWM CONTROLLER Functional Block Diagram VCC 34V UVLO S/R 5V REF AP384XG GND 2.50V REF INTERNAL BIAS VREF GOOD LOGIC OUTPUT OVER TEMP PROTECT S RT/CT OSC ERROR AMP Q Q PWM 2R 1V FB COMP CS R R CURRENT LATCH SENSE COMPARATOR Figure 3. Functional Block Diagram of AP384XG Ordering Information A Z 384XG Circuit Type Package M: SOIC-8 P: DIP-8 E1: Lead-free Blank: Tin Lead TR: Tape/Reel Blank: Tube Package SOIC-8 DIP-8 Temperature Range -40 to 85oC -40 to 85oC Part Number Tin Lead AP3842/3/4/5GM AP3842/3/4/5GP Marking ID Tin Lead 3842/3/4/5GM 3842/3/4/5GM AP3842/3/4/5GP LeadFree AP3842/3/4/5GM-E1 AP3842/3/4/5GP-E1 LeadFree 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 The listed part numbers are used during the transition to lead-free products. After the transition completed, lead-free products will be considered as the"standard" and we will resume the original part numbers. BCD Semiconductor Manufacturing Limited Preliminary Datasheet 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