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LED5000 Scheda tecnica(PDF) 31 Page - STMicroelectronics

Il numero della parte LED5000
Spiegazioni elettronici  3 A monolithic step-down current source with dimming capability
PDF  52 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LED5000 Scheda tecnica(HTML) 31 Page - STMicroelectronics

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LED5000
Application notes - buck conversion
Doc ID 023951 Rev 1
31/51
Figure 19.
constant current protection triggering hiccup mode
5.13
Application circuit
Figure 20.
Evaluation board application circuit
The network D3, R4, RS implements an inexpensive overvoltage protection. R4 effect can
be neglected during normal operation since the FB biasing current is negligible (tens of nA,
see
Table 5: Electrical characteristics) but it limits the current flowing in the Zener diode D3.
In case the load is disconnected or in case of open LED:
AM13503v1
small signal
power plane
RS
R56
TP6
GND
R1
10k
R3
24.9K
C7
1uF
50V
TP1
DIM
C6
100nF
TP4
VLED+
JP1
D3
BZX384-C39
C5
22pF
TP8
INH
TP5
VLED-
C4
470pF
TP3
GND
JP2
C1
10uF
50V
TP2
VIN
U1
LED5000
SW
8
VIN
7
BOOT
1
EP
EP
DIM
2
INH
3
GND
6
COMP
4
FB
5
C3
100nF
50V
C2
10uF
50V
R2
NM
C8
NM
D2
R4
47k
L1
47uH
AM13504v1



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