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參數(shù)資料
| 型號： | LM3842A |
| 廠商： | TAEJIN Technology Co., Ltd. |
| 英文描述： | CURRENT MODE PWM CONTROLLER |
| 中文描述： | 電流模式PWM控制器 |
| 文件頁數(shù)： | 4/7頁 |
| 文件大小： | 121K |
| 代理商： | LM3842A |
CURRENT MODE PWM CONTROLLER
LM3842A/3A/4A/5A
Fig.4 Current Sense Circuit
Peak current (I
S
) is determined by the formula:
I
S(MAX)
A small RC filter may be required to suppress switch transients.
Fig.5 Oscillator Waveforms and Maximum Duty Cycle
Oscillator timing capacitor, C
T
, is charged by V
REF
through R
T
, and discharged by an internal
current source. During the discharge time, the internal clock signal blanks the output to the
low state. Selection of R
T
and C
T
therefore determines both oscillator frequency and maximum
duty cycle. Charge and discharge times are determined by the formulas:
t
c
0.55 R
T
C
T
t
d
R
T
C
T
∫n(
)
Frequency, then, is: f = (t
c
+ t
d
)
-1
For R
T
>5KΩ, f
HTC
4
1
3
5
I
S
ERROR
AMP
2R
R
1V
CURRENT
SENSE
COMPARATOR
COMP
CURRENT
SENSE
GND
C
R
S
R
~
1.0V
R
S
~
0.0063 R
T
- 2.7
0.0063 R
T
- 4
~
1.8
R
T
C
T
~
8
4
5
V
REF
R
T
/C
T
GND
LARGE R
T
SMALL C
T
V
4
INTERNAL CLOCK
LARGE R
T
SMALL C
T
V
4
INTERNAL CLOCK
R
T
C
T
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| LM3842A_08 | 制造商:HTC 制造商全稱:HTC Korea TAEJIN Technology Co. 功能描述:CURRENT MODE PWM CONTROLLER |
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| LM3843A | 制造商:HTC 制造商全稱:HTC Korea TAEJIN Technology Co. 功能描述:CURRENT MODE PWM CONTROLLER |
| LM3843AD | 制造商:HTC 制造商全稱:HTC Korea TAEJIN Technology Co. 功能描述:CURRENT MODE PWM CONTROLLER |
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