Mc44603ap

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MC44603A Enhanced Mixed Frequency Mode GreenLine™ PWM Controller:
Fixed Frequency, Variable Frequency, Standby Mode
The MC44603A is an enhanced high performance controller that is specifically designed for off–line and dc–to–dc converter applications. This device has the unique ability of automatically changing operating modes if the converter output isoverloaded, 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 ontransistor 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• Operation up to 250 kHz Output Switching Frequency

MIXED FREQUENCY MODE GREENLINE PWM* CONTROLLER:
VARIABLE FREQUENCY, FIXED FREQUENCY, STANDBY MODE
* PWM = Pulse Width Modulation

16 1

P SUFFIX PLASTIC PACKAGE CASE 648

• • • • • • • • • • • • • • • • •

Inherent Feed Forward Compensation Latching PWM for Cycle–by–Cycle Current Limiting Oscillator with Precise Frequency Control16 1

High Flexibility • Externally Programmable Reference Current Secondary or Primary Sensing Synchronization Facility High Current Totem Pole Output Undervoltage Lockout with Hysteresis
VCC VC Output Gnd Foldback Input Overvoltage Protection (OVP) Current Sense Input Demag Detection

DW SUFFIX PLASTIC PACKAGE CASE 751G (SOP–16L)

PIN CONNECTIONS
1 2 3 4 5 6 7 8 16 Rref R 15 FrequencyStandby Voltage Feedback 14 Input 13 Error Amp Output 12 RPower Standby Soft–Start/Dmax/ 11 Voltage Mode 10 CT 9 Sync Input

Safety/Protection Features • Overvoltage Protection Against Open Current and Open Voltage Loop Protection Against Short Circuit on Oscillator Pin Fully Programmable Foldback Soft–Start Feature Accurate Maximum Duty Cycle Setting Demagnetization (Zero Current Detection)Protection Internally Trimmed Reference Enhanced Output Drive

GreenLine Controller: Low Power Consumption in Standby Mode • Low Startup and Operating Current Fully Programmable Standby Mode Controlled Frequency Reduction in Standby Mode Low dV/dT for Low EMI Radiations
Device GreenLine is a trademark of Motorola, Inc. MC44603AP MC44603ADW

(Top View)

ORDERING INFORMATION
Operating TemperatureRange TA = –25° to +85°C Package Plastic DIP–16 SOP–16L
Rev 1

© Motorola, Inc. 1999

MOTOROLA ANALOG IC DEVICE DATA

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MC44603A
MAXIMUM RATINGS
Rating Total Power Supply and Zener Current Supply Voltage with Respect to Ground (Pin 4) Output Current (Note 1) Source Sink Output Energy (Capacitive Load per Cycle) RF Stby, CT, Soft–Start, Rref, RP Stby Inputs Foldback Input, CurrentSense Input, E/A Output, Voltage Feedback Input, Overvoltage Protection, Synchronization Input Synchronization Input High State Voltage Low State Reverse Current Demagnetization Detection Input Current Source Sink Error Amplifier Output Sink Current Power Dissipation and Thermal Characteristics P Suffix, Dual–In–Line, Case 648 Maximum Power Dissipation at TA = 85°C Thermal Resistance, Junction–to–AirDW Suffix, Surface Mount, Case 751G Maximum Power Dissipation at TA = 85°C Thermal Resistance, Junction–to–Air Operating Junction Temperature Operating Ambient Temperature Symbol (ICC + IZ) VC VCC IO(Source) IO(Sink) W Vin Vin –0.3 to VCC + 0.3 VIH VIL Idemag–ib (Source) Idemag–ib (Sink) IE/A (Sink) VCC + 0.3 –20 –4.0 10 20 mA V mA mA Value 30 18 Unit mA V mA –750 750 5.0 –0.3 to 5.5 µJ V V...