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參數(shù)資料
| 型號： | IP3845N |
| 英文描述： | Current-Mode SMPS Controller |
| 中文描述： | 電流模式開關(guān)電源控制器 |
| 文件頁數(shù)： | 5/6頁 |
| 文件大?。?/td> | 70K |
| 代理商： | IP3845N |
LAB
SEME
IP1844 SERIES
IP1845 SERIES
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 2/95
APPLICATIONS INFORMATION
V - Pin 4
(Pin 7 for 14 Pin D Package)
8
4
5
GND
REF
V
R C
T
C
T
R
T
Internal Clock
Internal Clock
Output – Max. Duty Cycle
V - Pin 6
(Pin 10 for 14 Pin D Package)
Output – Max. Duty Cycle
V - Pin 6
(Pin 10 for 14 Pin D Package)
V - Pin 4
(Pin 7 for 14 Pin D Package)
LARGE
SMALL
R
T
C
T
LARGE
SMALL
R
T
C
T
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 formulae:
t
c
≈
0.55 R
T
C
T
t
d
≈
R
T
C
T
R
n
1
Resultant frequency f =(t
c
+ t
d
)
For R
T
> 5k
,
1.8
Resultant frequency f
≈
(R
T
C
T
)
.0063 R
T
– 2.3
.0063 – 4
( )
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