mc44602 ON Semiconductor, mc44602 Datasheet
mc44602
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mc44602 Summary of contents
Page 1
... High Performance Current Mode Controller The MC44602 is an enhanced high performance fixed frequency current mode controller that is specifically designed for off–line and high voltage dc–to–dc converter applications. This device has the unique ability of changing operating modes if the converter output is overloaded or shorted, offering the designer additional protection for increased system reliability ...
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... High State (I O(Source) = 0.5 mA 2.3 V) Low State (I O(Sink) = 0.33 mA 2.7 V) NOTES: 2. Adjust V CC above the startup threshold before setting to 12V. 3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible. 2 MC44602 Symbol Value ( Sink(neg) – ...
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... Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible. 4. This parameter is measured at the latch trip point with –5.0 ∆ 5. Comparator gain is defined ∆ V Current Sense Input MOTOROLA ANALOG IC DEVICE DATA MC44602 Symbol f OSC f OSC / V f OSC / T V OSC(pp) I dischg ...
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... 2.0 Note: Output switches at one–half the oscillator frequency. 1.0 0 100 k 200 k f OSC , OSCILLATOR FREQUENCY (Hz) 4 MC44602 Symbol – OL(UVLO (max) DC (min ∆ –100) V th(VL) V th(Demag) t PLH(in/out) ...
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... 2 4 100 Gain 60 Phase –20 0 100 k f, FREQUENCY (Hz) MOTOROLA ANALOG IC DEVICE DATA MC44602 Figure 4. Oscillator Voltage Swing 5 OSC = 3.0 V 4.0 Peak Voltage 3.0 2.0 1.0 Valley Voltage 0 75 100 125 –55 – AMBIENT TEMPERATURE ( C) Figure 6 ...
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... – 125 C –20 – – 120 I ref , REFERENCE SOURCE CURRENT (mA) 6 MC44602 Figure 10. Voltage Feedback Input versus Current Sense Clamp Level 2 Clamp = 1.0 V 2.2 1 Clamp = 0.5 V 1.4 1.0 –100 0 0 0.2 V Clamp , CURRENT SENSE CLAMP LEVEL (V) Figure 12 ...
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... 1 Current Sense = 8 4.0 8 SUPPLY VOLTAGE (V) MOTOROLA ANALOG IC DEVICE DATA MC44602 Figure 16. Output Cross Conduction 2 1 –1.0 A Figure 18. Source Output Saturation Voltage –55 C –0.5 –1.0 –1.5 –2 – ...
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... AMBIENT TEMPERATURE ( C) Figure 25. Minimum Operating Voltage After Turn–On versus Temperature 10.35 10.25 10.15 10.05 9.95 –55 – AMBIENT TEMPERATURE ( C) 8 MC44602 Figure 22. Demag Comparator Threshold 120 100 80 60 –55 –25 75 100 125 AMBIENT TEMPERATURE ( C) Figure 24. Startup Threshold Voltage 14.5 14.3 14.1 13 ...
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... Source Output 2.5V Load Detect 85mV Input 0V Demag Output Fault Latch Q 2.5V Sync Input 0V Startup With Foldback Startup Without Foldback *C = Comparison of Current Sense Input With V Clamp MOTOROLA ANALOG IC DEVICE DATA MC44602 20V Reference Regulator 14V V CC UVLO Reference UVLO 3.6V Load Demag Detect ...
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... Sink outputs low state, thus producing a controlled amount of output deadtime. An internal toggle flip–flop has been incorporated in the MC44602 which blanks the output off every other clock cycle by holding one of the inputs of the NOR gate high. This in combination with the C T discharge period yields output deadtimes programmable from 50% to 70% ...
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... zener is connected as a shunt regulator from ground. Its purpose is to protect the IC from excessive voltage that can occur during system startup. The upper limit for the minimum operating voltage of the MC44602 is 11V. Outputs The MC44602 contains a high current split totem pole output that was specifically designed for direct drive of Bipolar Power Transistors ...
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... The MC44602 operates as a conventional fixed frequency current mode controller when the power supply output load is less than the design limit. For enhanced system reliability, this device has the unique ability of changing operating modes if the power supply output is overloaded or shorted ...
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... Load Detect Input failed to exceed 2.5 V. Under these conditions, the Sync input will go high approximately 1.0 µs after the Load Detect Input exceeds the 85 mV Demag MOTOROLA ANALOG IC DEVICE DATA MC44602 Fault Latch Sync Q Out ...
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... ref 14 MC44602 PIN FUNCTION DESCRIPTION Description This pin is the Error Amplifier output and is made available for loop compensation. A voltage indicating a severe overload or short circuit condition at any output of the switching power supply is connected to this input. The Oscillator is controlled by this information making the power supply short circuit proof ...
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... V – 15 Turns, #25AWG (2 Strands) Bifiliar Wound Secondary: 6.8 V – 5 Turns, #25AWG (2 Strands) Bifiliar Wound Core – ETD39 34x17x11 B52 0.020 for a primary inductance of 750 µ 500 nH/Turn 2 Gap – MOTOROLA ANALOG IC DEVICE DATA MC44602 T1 47k MUR 2.0W 4100 270 1N4934 1.0µH MUR 415 8 ...
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... Secondary: 155 V – 52 Turns, #25AWG Secondary: 24.5 V – 9 Turns, #25AWG (2 Strands) Bifiliar Wound Secondary: 15.5 V – 6 Turns, #25AWG (2 Strands) Bifiliar Wound Core – GETV 53x18x18 B52 0.020 for a primary inductance of 1.35 µ 450 nH/Turn 2 Gap – 16 MC44602 T1 47k MUR 2.0W 4100 270 1N4934 1.0µH MUR 415 8. ...
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... NOTE 5 –T– SEATING PLANE 0.13 (0.005 MOTOROLA ANALOG IC DEVICE DATA MC44602 OUTLINE DIMENSIONS P2 SUFFIX PLASTIC PACKAGE CASE 648C–03 ISSUE C 9 –B– 0.13 (0.005 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14 ...
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... JAPAN: Nippon Motorola Ltd.; Tatsumi–SPD–JLDC, 6F Seibu–Butsuryu–Center, 3–14–2 Tatsumi Koto–Ku, Tokyo 135, Japan. 03–81–3521–8315 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852–26629298 MOTOROLA ANALOG IC DEVICE DATA *MC44602/D* MC44602/D ...