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UCC1800 Datasheet(PDF) 6 Page - Texas Instruments

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Part # UCC1800
Description  Low-Power BiCMOS Current-Mode PWM
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UCC1800 Datasheet(HTML) 6 Page - Texas Instruments

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UCC1800/1/2/3/4/5
UCC2800/1/2/3/4/5
UCC3800/1/2/3/4/5
Figure 1. Oscillator.
Figure 2. Error amplifier gain/phase response.
The UCC3800/1/2/3/4/5 oscillator generates a sawtooth
waveform on RC. The rise time is set by the time constant
of RT and CT. The fall time is set by CT and an internal tran-
sistor on-resistance of approximately 125 . During the fall
time, the output is off and the maximum duty cycle is re-
duced below 50% or 100% depending on the part number.
Larger timing capacitors increase the discharge time and re-
duce the maximum duty cycle and frequency.
4.00
3.98
3.96
3.94
3.92
3.90
3.88
3.86
3.84
3.82
4
4.2
4.4
4.6
4.8
5
5.2
5.4
5.6
5.8
6
V
(V)
CC
Figure 3. UCC1803/5 VREF vs. VCC;ILOAD = 0.5mA.
1000
100
10
10
100
1000
R(k)
T
100pF
200pF
330pF
1nF
Figure 4. UCC1800/1/2/4 oscillator frequency vs. RT and
CT.


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