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UCC28C43DGK Datasheet(PDF) 8 Page - Texas Instruments

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Part # UCC28C43DGK
Description  BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLER
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

UCC28C43DGK Datasheet(HTML) 8 Page - Texas Instruments

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UCC28C40, UCC28C41, UCC28C42, UCC28C43, UCC28C44, UCC28C45
UCC38C40, UCC38C41, UCC38C42, UCC38C43, UCC38C44, UCC38C45
SLUS458E -- AUGUST 2001 -- REVISED OCTOBER 2010
8
www.ti.com
APPLICATION INFORMATION
oscillator synchronization
The UCC38C4x oscillator has the same synchronization characteristics as the original bipolar devices. Thus,
the information in the Application Note U--100A, UC3842/3/4/5 Provides Low-Cost Current-Mode Control, (TI
Literature No. SLUA143) still applies. The application note describes how a small resistor from the timing
capacitor-to-ground can offer an insertion point for synchronization to an external clock, (see Figures 2 and 3).
Figure 2 shows how the UCC38C42 can be synchronized to an external clock source. This allows precise
control of frequency and dead time with a digital pulse train.
UDG--01069
8
4
VREF
RT/CT
UCC38C42
PWM
RT
CT
24 Ω
SYNCHRONIZATION
CIRCUIT INPUT
Figure 2. Oscillator Synchronization Circuit
ON .
LOW
LOW
HIGH
ON .
OFF .
CLOCK
INPUT
PWM
OUT
UPPER THRESHOLD
LOWER THRESHOLD
OUTPUT A
COMBINED
UPPER THRESHOLD
LOWER THRESHOLD
V
CT
V
CT (ANALOG)
V
SYNC (DIGITAL)
UDG--01070
Figure 3. Synchronization to an External Clock


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