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UC3845 Datasheet(PDF) 7 Page - Texas Instruments

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Part # UC3845
Description  Current Mode PWM Controller
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UC3845 Datasheet(HTML) 7 Page - Texas Instruments

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UNITRODE CORPORATION
7 CONTINENTAL BLVD.
• MERRIMACK, NH 03054
TEL. (603) 424-2410
• FAX (603) 424-3460
UC1842/3/4/5
UC2842/3/4/5
UC3842/3/4/5
OFFLINE FLYBACK REGULATOR
SLOPE COMPENSATION
A fraction of the oscillator ramp can be resistively
summed with the current sense signal to provide slope
compensation for converters requiring duty cycles over
50%.
Note that capacitor, C forms a filter with R2 to suppress
the leading edge switch spikes.
Power Supply Specifications
1. Input Voltage
95VAC to 130VA
(50 Hz/60Hz)
2. Line Isolation
3750V
3. Switching Frequency
40kHz
4. Efficiency @ Full Load
70%
5. Output Voltage:
A. +5V,
±5%; 1A to 4A load
Ripple voltage: 50mV P-P Max
B. +12V,
±3%; 0.1A to 0.3A load
Ripple voltage: 100mV P-P Max
C. -12V ,
±3%; 0.1A to 0.3A load
Ripple voltage: 100mV P-P Max
7


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