MC44604_05 ONSEMI [ON Semiconductor], MC44604_05 Datasheet
MC44604_05
Related parts for MC44604_05
MC44604_05 Summary of contents
Page 1
MC44604 High Safety Pulsed Mode Standby GreenLinet PWM Controller The MC44604 is an enhanced high performance controller that is specifically designed for off−line and dc−to−dc converter applications. Its high current totem pole output is ideally suited for driving a power ...
Page 2
Demagnetization Demagnetization 8 Management Detection Clamp Error V stby 12 Ampllifier Input i ref 4.7 V Oscillator Standby 15 Standby Management Management V ref + Error Voltage AMP Feedback 14 − Input E/A Output 13 Standby (lpk)max ...
Page 3
MAXIMUM RATINGS Rating Total Power Supply and Zener Current Output Supply Voltage with Respect to Ground Output Current (Note 1) − Source − Sink Output Energy (Capacitive Load per Cycle) Soft−Start Clamp Error Amp Input Foldback Input, Stand−by Management Overvoltage ...
Page 4
ELECTRICAL CHARACTERISTICS for min/max values T = −25° to +85°C [Note 7], unless otherwise noted.) A Characteristic ERROR AMPLIFIER SECTION (continued) Output Current Sink ( 2.7 V) E/A out −25° to +85°C ...
Page 5
ELECTRICAL CHARACTERISTICS for min/max values T = −25° to +85°C [Note 9], unless otherwise noted.) A Characteristic CURRENT SENSE SECTION Maximum Current Sense Input Threshold (V = 2.3 V and V Feedback (pin14) foldback (pin6) Input Bias Current Propagation Delay ...
Page 6
T , AMBIENT TEMPERATURE (°C) A Figure 1. Propagation Delay Current Sense Input vs. Temperature 3.2 3.1 3.0 2.9 2.8 −50 − AMBIENT ...
Page 7
F, FREQUENCY (kHz) Figure 7. Error Amplifier Gain and Phase vs. Frequency 49000 48000 47000 46000 45000 44000 43000 42000 41000 40000 −50 − ...
Page 8
T , AMBIENT TEMPERATURE (°C) A Figure 13. Peak Standby Current Setting Ratio vs. Temperature 1.2 1.0 0.8 0.6 0.4 0 100 200 300 I ...
Page 9
V , STARTUP THRESHOLD VOLTAGE stup 13.5 12.5 11.5 10 UVLO1 9.5 disable1 8 UVLO2 disable2 7.5 6.5 −50 − AMBIENT TEMPERATURE (°C) A Figure 19. Startup Threshold, UVLO1, UVLO2 ...
Page 10
Pin Name Output 4 GND 5 Foldback Input 6 Overvoltage Protection 7 Current Sense Input 8 Demagnetization Detection 9 Standby Current Set Soft−Start/D /Voltage−Mode max 12 Clamp Error Amplifier ...
Page 11
MC44604 Operating Description Schematics stup−th V disable1 V disable2 V ref UVLO1 V Pin 11 (Soft−Start) Output (Pin 0.3 mA Figure 24. Switching Off Behavior http://onsemi.com 11 Î Î Î Î Î ...
Page 12
Operating Description Schematics No−Take Over V CC Startup V CC prot V stup−th V disable1 V disable2 V ref UVLO1 V Pin 11 (Soft−Start) V OVP Out Î Î Output Î Î Î Î 0.3 mA ...
Page 13
Operating Description Schematics V ref V + 1.6 V CSS V 3 low 1 OSC Output (Pin 3) Figure 26. Soft−Start and D V demag in Output (Pin 3) V demag out Demagnetization V ...
Page 14
Error Amplifier A fully compensated Error Amplifier with access to the inverting input and output is provided. It features a typical DC voltage gain of 70 dB. The non−inverting input is internally biased at 2.5 V and is not pinned ...
Page 15
The Sawtooth Generation In the steady state, the oscillator voltage varies between about 1.6 V and 3.6 V. Indeed, the sawtooth is obtained by charging and discharging an external capacitor C T distinct current sources = I and I charge ...
Page 16
Zero Current V Detection Pin 8 On−Time Off−Time Dead−Time Figure 31. Demagnetization Detection A diode D has been incorporated to clamp the positive applied voltages while an active clamping system limits the negative voltages to typically −0.33 V. This negative ...
Page 17
Pin Connected to V Pin 0.4 I ref Figure 35. Different Possible Uses of Pin 11 In any case (particularly if no external component is connected to pin 11), an internal zener ...
Page 18
The overvoltage section is enabled 5 ms after the regulator has started to allow the reference V ref By connecting external resistors to pin 6, the threshold V level can be changed ref enable V CC (Pin 1) ...
Page 19
That is why, as explained in the transitions §, at each change of mode, the MC44604 is first turned off so that a new startup should be performed. V gets higher than V cc stup−th Startup YES ...
Page 20
V (14.5 V) stup V CC Stby V disable 2 (12 stby m P supply voltage V pin 15 I zener I reg I pin 15 I det output Î Î Î Î Î Î Î Î The ...
Page 21
Vac to 270 Vac RFI Filter C4....C7 1 nF/1000 V D1 ... D4 1N4007 (2W) 100 mF C16 R19 27 kW 100 ...
Page 22
0.25 (0.010) GreenLine is a trademark of Motorola, Inc. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make ...