Datasheet

LM2586
www.ti.com SNVS121D –MAY 1996–REVISED APRIL 2013
FREQUENCY SYNCHRONIZATION
Another feature of the LM2586 is the ability to synchronize the switching frequency to an external source, using
the sync pin (pin 6). This feature allows the user to parallel multiple devices to deliver more output power.
A negative falling pulse applied to the sync pin will synchronize the LM2586 to an external oscillator (see
Figure 54 and Figure 55).
Use of this feature enables the LM2586 to be synchronized to an external oscillator, such as a system clock. This
operation allows multiple power supplies to operate at the same frequency, thus eliminating frequency-related
noise problems.
Figure 55. Waveforms of a Synchronized 12V Boost Regulator
The scope photo in Figure 55 shows a LM2586 12V Boost Regulator synchronized to a 200 kHz signal. There is
a 700 ns delay between the falling edge of the sync signal and the turning on of the switch.
Figure 56. Boost Regulator
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