motorola mc44603ap free download

File name mc44603a-d.pdf

ON Semiconductort Enhanced Mixed Frequency Mode GreenLineTM PWM Controller: Fixed Frequency, Variable Frequency, Standby Mode The MC44603A is an enhanced high performance controller that is specifically designed for off­line and dc­to­dc converter applications. This device has the unique ability of automatically changing operating modes if the converter output is overloaded, unloaded, or shorted, offering the designer additional protection for increased system reliability. The MC44603A has several distinguishing features when compared to conventional SMPS controllers. These features consist of a foldback facility for overload protection, a standby mode when the converter output is slightly loaded, a demagnetization detection for reduced switching stresses on transistor and diodes, and a high current totem pole output ideally suited for driving a power MOSFET. It can also be used for driving a bipolar transistor in low power converters (< 150 W). It is optimized to operate in discontinuous mode but can also operate in continuous mode. Its advanced design allows use in current mode or voltage mode control applications. Current or Voltage Mode Controller MC44603A MIXED FREQUENCY MODE GREENLINE PWM* CONTROLLER: VARIABLE FREQUENCY, FIXED FREQUENCY, STANDBY MODE * PWM = Pulse Width Modulation 16 1 P SUFFIX PLASTIC PACKAGE CASE 648 · · · · · · · · · · · · · · · · · · · · · Operation up to 250 kHz Output Switching Frequency Inherent Feed Forward Compensation Latching PWM for Cycle­by­Cycle Current Limiting Oscillator with Precise Frequency Control Externally Programmable Reference Current Secondary or Primary Sensing Synchronization Facility High Current Totem Pole Output Undervoltage Lockout with Hysteresis Overvoltage Protection Against Open Current and Open Voltage Loop Protection Against Short Circuit on Oscillator Pin Fully Programmable Foldback Soft­Start Feature Accurate Maximum Duty Cycle Setting Demagnetization (Zero Current Detection) Protection Internally Trimmed Reference Enhanced Output Drive Low Startup and Operating Current Fully Programmable Standby Mode Controlled Frequency Reduction in Standby Mode Low dV/dT for Low EMI Radiations 16 1 High Flexibility DW SUFFIX PLASTIC PACKAGE CASE 751G (SOP­16L) PIN CONNECTIONS VCC VC Output Gnd Foldback Input Overvoltage Protection (OVP) Current Sense Input Demag Detection 1 2 3 4 5 6 7 8 16 Rref RFrequency Standby Voltage Feedback 14 Input 15 13 Error Amp Output 12 RPower Standby 11 Soft-Start/Dmax/ Voltage Mode Safety/Protection Features 10 CT 9 Sync Input (Top View) GreenLine Controller: Low Power Consumption in Standby Mode ORDERING INFORMATION Device MC44603AP MC44603ADW TA = ­25° to +85°C Operating Temperature Range Package Plastic DIP­16 SOP­16L GreenLine is a trademark of Motorola, Inc. © Semiconductor Components Industries, LLC, 2001 1 August, 2001 ­ Rev. 2 Publication Order Number: MC44603A/D MC44603A MAXIMUM RATINGS Rating Total Power Supply and Zener Current Supply Volt