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UCC3884 Datasheet(PDF) 7 Page - Texas Instruments

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Part # UCC3884
Description  Frequency Foldback Current Mode PWM Controller
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UCC3884 Datasheet(HTML) 7 Page - Texas Instruments

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7
UCC1884
UCC2884
UCC3884
Figure 4. Typical application.
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 FAX (603) 424-3460
UDG-96032-1
The following explains two synchronization techniques:
1.
If the user does not care which unit is the master,
then the oscillator frequencies are designed as accu-
rate as necessary and one unit will become the mas-
ter and synchronize the remaining units. The user
will never know exactly which unit will be themaster
upon power up.
2.
If the user does care which unit is the master, a unit
should be identified as the master, and the frequency
and maximum duty cycle clamp should be pro-
grammed accordingly. The ROFF resistor which pro-
grams the slave units oscillator discharge ramp
should be between 50% and 100% of the ROFF re-
sistor which programs the master. This guarantees
that if a slave unit tries to synchronize the master,
the master frequency will still be faster than the slave
frequency and the master will synchronize all the re-
maining units.
APPLICATION INFORMATION (cont.)


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