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A5974D Datasheet(PDF) 37 Page - STMicroelectronics

Part # A5974D
Description  Zero load current operation
PDF  46 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

A5974D Datasheet(HTML) 37 Page - STMicroelectronics

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DocID018774 Rev 2
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A5974D
Application information
46
Figure 27. Negative buck-boost regulator
8.9
Floating boost current generator
The A5974D device doesn’t support a nominal boost conversion as this topology requires
a low-side switch, however a floating boost can be useful in applications where the load can
be floating. A typical example is a current generator for LEDs driving as the LED does not
require a connection to the ground.
Figure 28. Floating boost topology
Figure 29. 350 mA LED boost current source
GND small signal
ILED = 350mA
GND power
VIN = 12VAC
C7
NM
C7
NM
TP3
VAC
TP3
VAC
C8
470n
C8
470n
R3
15
R3
15
L1
22uH
L1
22uH
R1
220K
R1
220K
C6
220n
C6
220n
C2
330u
C2
330u
C10
NM
C10
NM
C5
10uF
C5
10uF
D6
STPS3L40U
D6
STPS3L40U
C3
470n
C3
470n
TP2
VLED-
TP2
VLED-
D5
STPS3L40U
D5
STPS3L40U
R5
2K
R5
2K
D1
STPS3L40U
D1
STPS3L40U
C4
1u
C4
1u
R2
6.8k
R2
6.8k
TP6
VLED+
TP6
VLED+
D4
STPS3L40U
D4
STPS3L40U
TP1
VDC
TP1
VDC
TP5
GND
TP5
GND
VOUT
1
VCC
8
VREF
6
EX-PAD
9
INH
3
COMP
4
GND
7
FB
5
SYNC
2
U1
L5973D
U1
L5973D
TP4
VAC
TP4
VAC
R4
1.8
R4
1.8
Q1
BC327
Q1
BC327
C1
330u
C1
330u
C9
4.7u 50V
C9
4.7u 50V
C11
NM
C11
NM



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