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參數(shù)資料
| 型號： | 5962-8990502VEA |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.2 A SWITCHING CONTROLLER, 1150 kHz SWITCHING FREQ-MAX, CDIP16 |
| 封裝： | CERAMIC, DIP-16 |
| 文件頁數(shù)： | 15/18頁 |
| 文件大?。?/td> | 478K |
| 代理商： | 5962-8990502VEA |
UC1823A,UC2823A, UC2823B,
UC3823A,UC3823B,UC1825A,
UC2825A,UC2825B,UC3825A,UC3825B
SLUS334C AUGUST 1995 REVISED AUGUST 2004
www.ti.com
6
APPLICATION INFORMATION
The oscillator of the UC3823A, UC3823B, UC3825A, and UC3825B is a saw tooth. The rising edge is governed by a current
controlled by the RT pin and value of capacitance at the CT pin (CCT). The falling edge of the sawtooth sets dead time for
the outputs. Selection of RT should be done first, based on desired maximum duty cycle. CT can then be chosen based
on the desired frequency (RT) and DMAX. The design equations are:
R
T +
3V
(10 mA)
1
* D
MAX
C
T +
1.6
D
MAX
R
T
f
Recommended values for RT range from 1 k to 100 k. Control of DMAX less than 70% is not recommended.
UDG95102
Figure 1. Oscillator
10 M
1 M
100 k
10 k
1 k
10 k
100 k
Figure 2
RT Timing Resistance W
OSCILLATOR FREQUENCY
vs
TIMING RESISTANCE
f
Frequency
Hz
Figure 3
1 k
10 k
70
75
80
85
90
95
100
100 k
D
MA
X
Maximum
Duty
Cycle
%
RT Timing Resistance W
MAXIMUM DUTY CYCLE
vs
TIMING RESISTANCE
(1)
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