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| 型号： | 5962-8768102VEA |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2.2 A SWITCHING CONTROLLER, 1180 kHz SWITCHING FREQ-MAX, CDIP16 |
| 封装： | CERAMIC, DIP-16 |
| 文件页数： | 12/15页 |
| 文件大小： | 503K |
| 代理商： | 5962-8768102VEA |
APPLICATION INFORMATION
R
T +
3 V
(10 mA)
1 * DMAX
C
T +
1.6
D
MAX
R
T
f
(1)
UDG-95102
1 k
10 k
70
75
80
85
90
95
100
100 k
D
M
A
X
-Maximum
Duty
Cycle
-
%
RT - Timing Resistance - W
MAXIMUM DUTY CYCLE
vs
TIMING RESISTANCE
10 M
1 M
100 k
10 k
1 k
10 k
100 k
RT - Timing Resistance - W
OSCILLATOR FREQUENCY
vs
TIMING RESISTANCE
f
-Frequency
-
Hz
SLUS873A – JANUARY 2009 – REVISED APRIL 2009 ..................................................................................................................................................... www.ti.com
The oscillator of the UC1825A 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:
Recommended values for RT range from 1 k to 100 k. Control of DMAX less than 70% is not recommended.
Figure 1. Oscillator
Figure 2.
Figure 3.
6
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): UC1825A-SP
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