sc483itstrt Semtech Corporation, sc483itstrt Datasheet - Page 7

• Manufacturer Part Number: sc483itstrt
• Description: Sc483 Dual Synchronous Buck Pseudo-fixed-frequency Power-supply Controller
• Manufacturer: Semtech Corporation

POWER MANAGEMENT
Block Diagram
2005 Semtech Corp.
VCCA1 (25)
EN/SPV1 (22)
TON1 (23)
VOUT1 (24)
FB1 (26)
PGD1 (27)
VSSA1 (28)
VCCA2 (11)
EN/SPV2 (8)
TON2 (9)
VOUT2 (10)
FB2 (12)
PGD2 (13)
VSSA2 (14)
DSCHG1
2
DSCHG2
1
DSCHG2
DSCHG1
POR / SS
1.5V REF
POR / SS
1.5V REF
X3
X3
TON
TOFF
TON
TOFF
+
-
+
-
FAULT
MONITOR
FAULT
MONITOR
OT
OT
FIGURE 1.
7
ON
OFF
PWM
REF + 16%
REF - 10%
REF - 30%
ON
OFF
PWM
REF + 16%
REF - 10%
REF - 30%
ZERO I
OV
UV
ZERO I
OV
UV
OC
OC
CONTROL
LOGIC
CONTROL
LOGIC
ISENSE
ISENSE
HI
LO
HI
LO
2
1
BST1 (7)
DH1 (6)
LX1 (5)
ILIM1 (4)
VDDP1 (3)
DL1 (2)
PGND1 (1)
BST2 (21)
DH2 (20)
LX2 (19)
ILIM2 (18)
VDDP2 (17)
DL2 (16)
PGND2 (15)
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SC483