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參數(shù)資料
| 型號： | L4990A |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | PRIMARY CONTROLLER |
| 中文描述： | 主控制器 |
| 文件頁數(shù)： | 21/24頁 |
| 文件大小： | 322K |
| 代理商： | L4990A |
L4990
D97IN511A
DC
V
CC
VREF
R
START
3
12
8
4
11
Figure 40. Protection against overvol-
tage/feedbackdisconnection(not
latched)
D97IN512A
PGND
L4990
OPTIONAL
VREF
SGND
DIS
ISEN
I
4
14
13
12
11
R
SENSE
R
2
R
1
I
pk
I
pk max
2.5
R
SENSE
1-
R
2
R
1
Figure41. Device shutdown on overcurrent
D97IN513
PGND
L4990
OUT
SGND
ISEN
Lp
R
FF
R
V
IN
R
FF
= 5·10
6
R·Lp
RSENSE
RSENSE
13
10
12
11
80
÷
400V
DC
Figure 42. Constant powerin pulse-by-pulsecurrentlimitation (flyback discontinuous)
REFERENCES
[1] Efficient active Clamp for Off-line Applicationsusing L4990 and L6380 (N.Tricomi, G. Gattavari,
C. Adragna,PCIM96 - NURBERG).
[2] 25WOff-Line AutorangingBattery Charger with L4990 (AN889)
[3] 300W SecondaryControlledTwo-SwitchForward Converter with L4990 (AN890)
[4] SMPS with L4990 forMultisync Monitors(AN891)
[5] HighperformanceVRM using L4990A,for PentiumPro
processor(AN908).
L4990
DC
10K
COMP
3
6
12
13
SGND
ISEN
D97IN570A
Figure 43. Voltage mode operation.
L4990 - L4990A
21/24
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| L4992 | 制造商:STMicroelectronics 功能描述: 制造商:STMicroelectronics 功能描述:VOLT SUPERVISOR CNTRLR 5.1V/3.3V 32TQFP - Trays |
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