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LM3101M Scheda tecnica(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Il numero della parte LM3101M
Spiegazioni elettronici  Secondary-Side PWM Controller
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3101M Scheda tecnica(HTML) 8 Page - National Semiconductor (TI)

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Functional Description
OscillatorSynchronization Section
The operating frequency is set by a single resistor connect-
ed from the RT pin (pin 1) to ground according to the equa-
tion
FO e 025(RT  20 pF)
kHz X
Inserting a 25 kX for RT sets the oscillator frequency at
500 kHz
The oscillator is capable of synchronizing to an external
source To synchronize the oscillator an external source is
connected to the SYNC pin (pin 4) via a differentiator (see
Figure 1 ) The external source delivers a pulse train to the
differentiator which converts this signal into an AC-coupled
signal The negative-edge of this signal applied to the
SYNC pin will control the oscillator and thus set the operat-
ing frequency The recommended values for RSYNC and
CSYNC are as follows
RSYNC e 1kX (typical)
and
CSYNC  RSYNC l 1(8  FSYNC)
F X kHz
To synchronize to a 600 kHz external source and using a
RSYNC of1kX the CSYNC must be
CSYNC l 1(8  RSYNC  FSYNC) e 1(8  1kX  600 kHz)
e
208 pF
220 pF
The oscillator frequency should range from 67% to 90% of
the synchronization frequency In the above example the
oscillator frequency can be between 400 kHz and 540 kHz
TLH11436 – 6
FIGURE 1 Simplified Version of the
Synchronization Circuit
TLH11436 – 7
FIGURE 2 Simplified Version of the Short
Circuit Frequency Shift Circuit
8


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