參數(shù)資料
型號: UCC2800PWTR
廠商: Texas Instruments, Inc.
英文描述: Low-Power BiCMOS Current-Mode PWM
中文描述: 低功耗BiCMOS電流模式PWM
文件頁數(shù): 6/20頁
文件大?。?/td> 383K
代理商: UCC2800PWTR
6
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 R
T
and C
T
. 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
V
(
R
Figure 3. UCC1803/5 V
REF
vs. V
CC
; I
LOAD
= 0.5mA.
1000
100
10
10
100
R (k )
T
1000
O
100pF
200pF
330pF
1nF
Figure 4. UCC1800/1/2/4 oscillator frequency vs. R
T
and
C
T
.
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