Details, datasheet, quote on part number: MC44603AP
DescriptionMixed Frequency Mode Greenline PWW Controller
CompanyMotorola Semiconductor Products
DatasheetDownload MC44603AP datasheet
Cross ref.Similar parts: UC1823, UC1823A, UC2823, UC3823, MC44603A
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Features, Applications

Advance Information Mixed Frequency Mode GreenLineTM PWM Controller:
Fixed Frequency, Variable Frequency, Standby Mode

The 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 MC44603 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 Operation to 250 kHz Output Switching Frequency


Inherent Feed Forward Compensation Latching PWM for Cycle­by­Cycle Current Limiting Oscillator with Precise Frequency Control

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

Rref R 15 Frequency Standby Voltage Feedback 14 Input 13 Error Amp Output 12 RPower Standby Soft­Start/Dmax/ 11 Voltage Mode 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 Soft­Start Feature Accurate Maximum Duty Cycle Setting Demagnetization (Zero Current Detection) Protection Internally Trimmed Reference

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

This document contains information on a new product. Specifications and information herein are subject to change without notice.

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, Soft­Start, Rref, RP Stby Inputs Foldback Input, Current Sense 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, Dual­In­Line, Case 648 Maximum Power Dissipation = 85°C Thermal Resistance, Junction­to­Air DW Suffix, Surface Mount, Case 751G Maximum Power Dissipation = 85°C Thermal Resistance, Junction­to­Air Operating Junction Temperature Operating Ambient Temperature Symbol (ICC + IZ) VC VCC IO(Source) IO(Sink) W Vin ­0.3 to VCC + 0.3 VIH VIL Idemag­ib (Source) Idemag­ib (Sink) IE/A (Sink) VCC V mA Value 30 18 Unit µJ V

NOTES: 1. Maximum package power dissipation limits must be observed. 2. ESD data available upon request.

ELECTRICAL CHARACTERISTICS (VCC and 12 V, [Note 3], Rref = 820 pF, for typical values = 25°C,

for min/max values to +85°C [Note 4], unless otherwise noted.) Characteristic OUTPUT SECTION Output Voltage (Note 5) Low State (ISink = 100 mA) Low State (ISink = 500 mA) High State (ISource = 200 mA) High State (ISource = 500 mA) Output p Voltage g During g Initialization Phase VCC 1.0 V, ISink 10 µA VCC 0V V, ISi Sink 100 µA VCC V, V ISink mA Output Voltage Rising Edge Slew­Rate (CL = 1.0 nF, = 25°C) Output Voltage Falling Edge Slew­Rate (CL = 1.0 nF, = 25°C) ERROR AMPLIFIER SECTION Voltage Feedback Input (VE/A out 2.5 V) Input Bias Current (VFB 2.5 V) Open Loop Voltage Gain (VE/A out 4.0 V) VFB IFB­ib AVOL dB V VOL VOH VOL ­ dVo/dT V/µs V Symbol Min Typ Max Unit

NOTES: 3. Adjust VCC above the startup threshold before setting V. 4. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible. 5. VC must be greater than 5.0 V.

ELECTRICAL CHARACTERISTICS (continued) (VCC and 12 V, [Note 3], Rref = 820 pF, for typical values = 25°C, for min/max values to +85°C [Note 4], unless otherwise noted.)

Characteristic ERROR AMPLIFIER SECTION (continued) Unity Gain Bandwidth to +85°C Voltage Feedback Input Line Regulation (VCC 15 V) Output Current Sink (VE/A out 1.5 V, VFB to +85°C Source (VE/A out 5.0 V, VFB to +85°C Output Voltage Swing High State (IE/A out (source) = 0.5 mA, VFB 2.3 V) Low State (IE/A out (sink) = 0.33 mA, VFB 2.7 V) REFERENCE SECTION Reference Output Voltage (VCC 15 V) Reference Current Range (Iref = Vref/Rref, 25 k) Reference Voltage Over Iref Range OSCILLATOR AND SYNCHRONIZATION SECTION Frequency to +85°C Frequency Change with Voltage (VCC 15 V) Frequency Change with Temperature (TA to +85°C) Oscillator Voltage Swing (Peak­to­Peak) Ratio Charge Current/Reference Current to +70°C (VCT to +85°C Fixed Maximum Duty Cycle = Idischarge/(Idischarge + Icharge) Ratio Standby Discharge Current versus IR F Stby (Note to +85°C (Note VR F Stby (IR F Stby = 100 µA) Frequency in Standby Mode (RF Stby (Pin 25 k) Current Range Synchronization Input Threshold Voltage (Note 7) Synchronization Input Current Minimum Synchronization Pulse Width (Note 8) UNDERVOLTAGE LOCKOUT SECTION Startup Threshold Output Disable Voltage After Threshold Turn­On (UVLO to +85°C Reference Disable Voltage After Threshold Turn­On (UVLO 2) Vstup­th 15.4 V fOSC 44.5 44 fOSC/V fOSC/T VOSC(pp) Icharge/Iref 0.37 D Idisch­Stby/ IR F Stby VR F Stby FStby IR F Stby VinthH VinthL ISync­in TSync V kHz µA µs %/V %/°C V ­ kHz Vref Iref Vref BW ­ VFBline­reg ISink ISource V VOH VOL mV mA MHz Symbol Min Typ Max Unit

NOTES: 13. Adjust VCC above the startup threshold before setting V. 14. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible. 16. Standby is disabled for VR P Stby 25 mV typical. 17. If not used, Synchronization input must be connected to Ground. 18. Synchronization Pulse Width must be shorter than TOSC = 1/fOSC.


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