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Cirrus-logic AN374 Manual de usuario Pagina 12

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AN374
12 AN374REV2
Flyback topology is enabled by setting bit S2CONFIG to ‘1’ in register Config12 at address 44. A flyback
topology is selected as a design guide example in application note AN368 so bit S2CONFIG is set to ‘1’. The
flyback transformer input-to-output voltage ratio is used to determine the duty cycle and minimum turn on time
T1 for the power FET. Buck topology is enabled by setting bit S2CONFIG to ‘0’ in register Config12 at address
44. If a buck topology is selected, the buck inductor is configured using bits BUCK[3:0] in register Config10 at
address 42. Set bits BUCK[3:0] to ‘0’ or ‘1’ for a normal buck topology. Tapped buck topology is enabled by
setting bit S2CONFIG to ‘0’ in register Config12 at address 44 and by setting bits BUCK[3:0] in register
Config10 at address 42 to the required value N, where N equals the turns ratio between primary and secondary
windings.
Figure 4a. Tapped Buck Series Output Model Figure 4b. Buck Series Output Model
R22
R21
R23
Q5
L3
D3
CS1630 /31
FBAUX
GND
13
GD
FB SENSE
15
12
11
V
BST
R3
D9
U2
C10
C8
C15
D11
D
GND
_
Q
VCC
R12 D10
Q3
R2
C14
Channel 1 LED
(White)
Channel 2 LED
(Red)
GND
IGND
D9
R22
R21
R23
Q4
L3
CS1630 /31
FBAUX
GND
13
GD
FBSENSE
15
12
11
D3
V
BST
R25
D9
U2
C13
C15
C16
D11
D
GND
_
Q
VCC
R26 D10
Q5
R27
C14
Z3
Channel 1 LED
(W hite )
Channel 2 LED
(Red)
GND
IGND
Figure 4c. Flyback Series Output Model
D2
R22
Z3
R21
R23
Q5
CS1630 /31
FBAUX
GND
13
GD
FBSENSE
15
12
11
TX1
V
BST
R3
D6
U2
C10
C8
C15
D5
D
GND
_
Q
VCC
D15
R12 D10
Q3
R2
C16
Channel 1 LED
(White)
Channel 2 LED
(Red)
GND
IGND
I
MODE x
I
PRI
V
MOD Ex
D9
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