Details, datasheet, quote on part number: MC44605
CategoryPower Management => PWM Controllers => Others
DescriptionHigh SaFETy Greenline PWM Controller For (multi) Synchronized Applications
CompanyON Semiconductor
DatasheetDownload MC44605 datasheet
Cross ref.Similar parts: MC44605P
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Features, Applications
MC44605 High Safety, Latched Mode, GreenLineTM PWM Controller for (Multi)Synchronized Applications

The is a high performance current mode controller that is specifically designed for off­line converters. This circuit has several distinguishing features that make it particularly suitable for multisynchronized monitor applications. The MC44605 synchronization arrangement enables operation from 16 kHz to 130 kHz. This product was optimized to operate with universal mains voltage, i.e., from 280 V, and its high current totem pole output makes it ideally suited for driving a power MOSFET. The MC44605 protections enable a well­controlled and safe power management. Four major faults while detected, activate the analogic counter of a disabling block designed to perform a latched circuit output inhibition.

Current Mode Controller MARKING DIAGRAM

Current Mode Operation 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 (Availability of Error Amplifier Output) Synchronization Facility High Current Totem Pole Output Vcc Undervoltage Lockout with Hysteresis Low Output dV/dT for Low EMI Radiations Low Start­Up and Operating Current

A = Assembly Location WL, L = Wafer Lot YY, Y = Year WW, W = Work Week

VCC VC Output Gnd Max Power Limitation Overheating Detection Current Sense Input Demagnetization Detection Input

16 Rref 15 WSCD* Program 14 Voltage Feedback Input 13 Error Amp Output 12 Disabling Block (Cext) 11 Soft-Start Input 10 Osc Capacitor (CT) 9 Sync and

Soft­Start Feature Demagnetization (Zero Current Detection) Protection Overvoltage Protection Facility against Open Loop EHT Overvoltage Protection (E.H.T.OVP): Detection of too High Synchronization Pulses Winding Short Circuit Detection (W.S.C.D.) Limitation of the Maximum Input Power (M.P.L.): Calculation of Input Power for Overload Protection Overheating Detection (O.H.D.): to Prevent the Power Switch from an Excessive Heating

Winding Short Circuit (WSCD), a too high input power (M.P.L.), power switch overheating (O.H.D.), an analogic counter is activated If the counter is activated for a time that is long enough, the circuit gets definitively disabled. The latch can only be reset by making decrease the Vcc down to about 3 V, i.e., practically by unplugging or turning off the SMPS.

R ref 16 V ref Demagnetization Detection Input 8 Demagnetization Management Output T 10 Synchronization and EHTOVP 9 Input DT V demag out Reference Block I ref Oscillator Sf W.S.C.D* Comparator V shift V WSCD dis MPL dis OHD Disout I sense Vcs Sf dis MPL block cs 2 dis OHD V shift Level Programmation Vcs I sense E.H.T.OVP Block V CC Current Sense VS Disout Set Q PWM Latch Reset Thermal Shutdown Buffer 3 Output i ref V cc enable Supply Initialization Block CC 1

Over Voltage Management V CC enable 15 I ref V CC enable MC44605 WSCD Programmation

Current Maximum Over Soft­Start Power Heating Input Sense Limitation Detection Input *W.S.C.D. = Winding Short Circuit Detection

Rating Total Power Supply and Zener Current Output Supply Voltage with Respect to Ground Output Current* Source Sink Output Energy (Capacitive Load per Cycle) Soft­Start Current Sense, Voltage Feedback, E/A Output, CT, Rref, MPL, OHD, Cext, WSCD E.H.T.OVP, Sync Input Current Source Sink Demagnetization Detection Input Current Source Sink Error Amplifier Output Sink Current Power Dissipation and Thermal Characteristics Maximum Power Dissipation = 85°C Thermal Resistance, Junction­to­Air Operating Junction Temperature Operating Ambient Temperature *Maximum package power dissipation must be observed. Idemag­ib (Source) Idemag­ib (Sink) 13 IE/A (Sink) PD RJA mA W °C/W 1 3 IO(Source) IO(Sink) W VSS Vin V mA Isync (Source) IEHT (Source) Isync (Sink) IEHT (Sink) 10 mA Pin # Symbol (ICC + IZ) VC VCC Value 40 18 Unit V mA

ELECTRICAL CHARACTERISTICS (VCC and 12 V, Rref = 2.2 nF, for typical values = 25°C, for min/max

values to +85°C unless otherwise noted.) (Note 1) Characteristic OUTPUT SECTION (Note 2) Output Voltage* Low Level Drop Voltage (ISink = 100 mA) (ISink = 500 mA) High Level Drop Voltage (ISource = 200 mA) (ISource = 500 mA) Out ut Voltage During Initialization Phase Output VCC 1.0 V, ISink 10 µA VCC 5.0 V, ISink 100 µA VCC V V, ISink mA A Output Voltage Rising Edge Slew­Rate (CL = 1.0 nF, = 25°C) Output Voltage Falling Edge Slew­Rate (CL = 1.0 nF, 25°C) 3 VOL VOH 3 VOL ­ dVo/dT V/µs V Pin # Symbol Min Typ Max Unit

*VC must be greater than V. 1. Adjust VCC above the start­up threshold before setting 12 V. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible. 2. No output signal when the Error Amplifier output is in Low State, i.e., when for instance, VFB 2.7 V.


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