|Category||Power Management => AC-DC Controllers/Converters => AC-DC Switching => Off-Line Controllers|
|Description||Fixed-40kHz Flyback PWM Voltage-mode Controller With 500V Maximum Startup And Programmable Burst-mode Standby, Package: Pdip, Pins=8|
|Datasheet||Download MC44608P40 datasheet
|Cross ref.||Similar parts: LM2574, LM2574HV, LM2578A, LM2594, LM2594HV, LM2597, LM2597HV, LM2671, LM2672, LM2674|
|MC44608 Few External Components Reliable and Flexible SMPS Controller
The is a high performance voltage mode controller designed for offline converters. This high voltage circuit that integrates the startup current source and the oscillator capacitor, requires few external components while offering a high flexibility and reliability. The device also features a very high efficiency standby management consisting of an effective Pulsed Mode operation. This technique enables the reduction of the standby power consumption to approximately 1.0 W while delivering 150 W SMPS. Integrated StartUp Current Source Lossless OffLine StartUp Direct OffLine Operation Fast StartUp
Flexibility Duty Cycle Control Undervoltage Lockout with Hysteresis On Chip Oscillator Switching Frequency or 100 kHz Secondary Control with Few External Components
Maximum Duty Cycle Limitation Cycle by Cycle Current Limitation Demagnetization (Zero Current Detection) Protection "Over VCC Protection" Against Open Loop Programmable Low Inertia Over Voltage Protection Against Open Loop Internal Thermal Protection
Device MC44608P75 MC44608P100 Switching Frequency Package Shipping 40 kHz 75 kHz 100 kHz Plastic DIP8 Plastic DIP8 Plastic DIP8 50/RailPulsed Mode Techniques for a Very High Efficiency
Low Power Mode Lossless Startup Low dV/dT for Low EMI Radiations
DMG m A Latched off Phase Start-up Phase Latched off Phase Start-up Phase OSC Enable Stand-by Management OC NOC Output 1V 4 kHz Filter OSC mS & Switching Phase OVP UVLO1 UVLO2 OUT Disable DMG & Thermal S Shutdown PWM Latch R Q Buffer V CC Management 9 mADemag Logic Output Start-up Phase m A Switching Phase 0 & Stand-by
Latched off Phase & Stand-by S2 S3 Regulation Block Switching Phase
Rating Total Power Supply Current Output Supply Voltage with Respect to Ground All Inputs except Vi Line Voltage Absolute Rating Recommended Line Voltage Operating Condition Power Dissipation and Thermal Characteristics Maximum Power Dissipation = 85°C Thermal Resistance, JunctiontoAir Operating Junction Temperature Operating Ambient Temperature Symbol ICC VCC Vinputs Vi PD RJA TJ TA Value to +85 Unit mA mW °C/W °C
Characteristic OUTPUT SECTION Output Resistor Sink Resistance Source Resistance Output Voltage Rise Time (from 9.0 V) (Note 1.) Output Voltage Falling Edge SlewRate (from 9.0 V down 3.0 V) (Note 1.) CONTROL INPUT SECTION Duty Cycle 2.5 mA Duty Cycle 1.0 mA Control Input Clamp Voltage (Switching Phase) 1.0 mA Latched Phase Control Input Voltage (Standby) +500 mA Latched Phase Control Input Voltage (Standby) +1.0 mA CURRENT SENSE SECTION Maximum Current Sense Input Threshold Input Bias Current StandBy Current Sense Input Current Startup Phase Current Sense Input Current Propagation Delay (Current Sense Input to Output @ VTH T MOS 3.0 V) Leading Edge Blanking Duration Leading Edge Blanking Duration Leading Edge Blanking Duration Leading Edge Blanking + Propagation Delay Leading Edge Blanking + Propagation Delay Leading Edge Blanking + Propagation Delay OSCILLATOR SECTION Normal Operation Frequency MC44608P40 Normal Operation Frequency MC44608P75 Normal Operation Frequency MC44608P100 Maximum Duty Cycle f = fosc OVERVOLTAGE SECTION Quick OVP Input Filtering (Rdemag = 100 kW) Propagation Delay (Idemag > Iovp to output low) Quick OVP Current Threshold Protection Threshold Level on VCC Minimum Gap Between VCCOVP and Vstupth Tfilt TPHL(In/Out) IOVP VCCOVP Vstup µA V fosc dmax kHz MC44608P75 MC44608P100 VCSth IBcs ICSstby ICSstup TPLH(In/Out) TLEB TDLY mA ns VLPstby d2mA d1mA ROL ROH tf ns Symbol Min Typ Max Unit1. This parameter is measured using 1.0 nF connected between the output and the ground.
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