UCC1884 Unitrode Semiconductor, UCC1884 Datasheet - Page 7

• Manufacturer Part Number: UCC1884
• Description: Frequency Foldback Current Mode PWM Controller
• Manufacturer: Unitrode Semiconductor

OSCILLATOR INFORMATION (cont.)
The following explains two synchronization techniques:
1. If the user does not care which unit is the master,
2. If the user does care which unit is the master, a unit
TYPICAL APPLICATION
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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 the master
upon power up.
should be identified as the master, and the frequency
MERRIMACK, NH 03054
7
and maximum duty cycle clamp should be pro-
grammed accordingly. The R
grams the slave units oscillator discharge ramp
should be between 50% and 100% of the R
tor 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 fre-
quency and the master will synchronize all the re-
maining units.
OFF
resistor which pro-
UCC1884
UCC2884
UCC3884
UDG-96032-1
OFF
resis-