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UCC3884 Datasheet(PDF) 7 Page - Texas Instruments |
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UCC3884 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 8 page 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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