L5991 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L5991' PDF : 19 Pages View PDF
Figure 42. Protection against overvoltage/feedback disconnection (latched)
L5991 - L5991A
RSTART
RSTART
VCC
8
DIS
14 L5991
12
11
SGND PGND
D97IN754
VZ
VCC
8
DIS
14 L5991
2.2K
12
11
SGND PGND
D98IN905
Figure 43 Protection against overvoltage/feed-
back disconnection (not latched)
RSTART
VREF
VCC
4
8
DC
L5991
3
12
11
D97IN755A
Figure 44. Device shutdown on overcurrent
L5991
VREF
4
R1
DIS
14
Ipk max ≅
2.5
RSENSE
• 1- R2
R1
I
Ipk
R2
13
11
12
PGND SGND
ISEN
OPTIONAL
D97IN756A
RSENSE
Figure 45. Constant power in pulse-by-pulse current limitation (flyback discontinuous)
VIN
80 ÷ 400VDC
OUT
10
L5991
13
11
12
PGND SGND
ISEN
RFF
R
Lp
RFF = 6·106
R·Lp
RSENSE
RSENSE
Figure 46. Voltage mode operation.
D97IN757
DC
3
10K
L5991
6
COMP
12 13
SGND
ISEN
D97IN758A
19/23
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