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PTH04T220WAZ Datasheet(PDF) 25 Page - Texas Instruments

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No. de pieza PTH04T220WAZ
Descripción Electrónicos  16-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TURBOTRANS
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PTH04T220WAZ Datasheet(HTML) 25 Page - Texas Instruments

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Smart Sync
PTH04T220W
Vi
Track
GND
VoAdj
Vo
TT
+Sense
−Sense
Inhibit/
UVLO
GND
D
PRE
Vi
GND
VoAdj
Vo
TT
+Sense
−Sense
+
Inhibit/
UVLO
Sync
+
+
Q
CLK
SN74LVC2G74
+
SYNC
RSET1
330
µF
fCLK = 2 x fMODULE
VO1
0
°
180
°
VCC
CLR
Q
VO2
CO1
CO2
UDG−06051
CI1
CI2
RSET2
330
µF
220
µF
220
µF
Track
VI = 5 V
PTH04T220W
PTH04T220W, PTH04T221W
SLTS275A – DECEMBER 2006 – REVISED FEBRUARY 2007
Smart Sync is a feature that allows multiple power modules to be synchronized to a common frequency. Driving
the Smart Sync pins with an external oscillator set to the desired frequency, synchronizes all connected modules
to the selected frequency. The synchronization frequency can be higher or lower than the nominal switching
frequency of the modules within the range of 240 kHz to 400 kHz (see Electrical Specifications table for
synchronization limits). Synchronizing modules powered from the same bus, eliminates beat frequencies
reflected back to the input supply, and also reduces EMI filtering requirements. Eliminating the low beat
frequencies (usually < 10 kHz) allows the EMI filter to be designed to attenuate only the synchronization
frequency. Power modules can also be synchronized out of phase to minimize source current loading and
minimize input capacitance requirements. Figure 25 shows a standard circuit with two modules syncronized 180
°
out of phase using a D flip-flop.
Figure 25. Smart Sync Schematic
25
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