L6917 STMicroelectronics, L6917 Datasheet - Page 22

• Manufacturer Part Number: L6917
• Description: 5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER
• Manufacturer: STMicroelectronics

L6917B
Figure 16. Demo Board Schematic
Several jumpers allow setting different configurations for the device: JP3, JP4 and JP5 allow configuring the
remote buffer as desired. Simply shorting JP4 and JP5 the remote buffer is enabled and it senses the output
voltage on-board; to implement a real remote sense, leave these jumpers open and connect the FBG and FBR
connectors on the demo board to the remote load. To avoid using the remote buffer, simply short all the jumpers
JP3, JP4 and JP5. Local sense through the R7 is used for the regulation.
The input can be configured in different ways using the jumpers JP1, JP2 and JP6; these jumpers control also
the mosfet driver supply voltage. Anyway, power conversion starts from VIN and the device is supplied from
V
Figure 17. Power supply configuration
Two main configurations can be distinguished: Single Supply (V
V
22/33
GNDin
GNDcc
CC
IN
Vcc
Vin
= 5V or different).
(See Figure 17).
JP6
GNDin
GNDcc
Vcc
S4
S3
S2
S1
S0
Vin
C5
L1
D1
DZ1
JP1
C4
Q1a
JP6
D4
Q2
Q1
R16
R2
JP2
C8
R15
R18
R13
R6
R5
OSC / INH
PGNDS1
UGATE1
PHASE1
LGATE1
VCCDR
BOOT1
ISEN1
SGND
VID4
VID3
VID2
VID1
VID0
2
5
4
3
1
13
14
22
21
20
19
18
17
7
FBR
DZ1
JP1
L6917B
11
U1
12
FBG
24
25
26
27
16
15
28
23
10
JP2
6
9
8
VCC
BOOT2
UGATE2
PHASE2
LGATE2
ISEN2
PGNDS2
PGND
PGOOD
VSEN
FB
COMP
R14
R17
R12
C7
R3
R10
R8
C2
CC
R4
To Vcc pin
To HS Drains (Power Input)
To BOOTx (HS Driver Supply)
To VCCDR pin (LS Driver Supply)
= V
R7
Q4
Q3
D3
IN
C1
= 12V) and Double Supply (V
Q3a
C3
R9
JP3
D2
C6
L2
R1
C9,C10
C14,
C23
C11..C13
JP4
R19
R20
JP5
CC
VoutCORE
GNDCORE
PGOOD
FBG
FBR
= 12V