Si9139 Datasheet, PDF (14/17 Pages) Vishay Siliconix – Multi-Output, Individual On/Off Control Power-Supply Controller

Si9139
Vishay Siliconix
New Product
DETAILED FUNCTIONAL BLOCK DIAGRAMS
FB_
+
CS_
1X_
FB_
R_X
Internal
Reference
SLC
Error
-
Amplifier
+
PWMCMP
-
+
Pulse
Skipping
Control
20 mV
Current
Limit
ON_A or ON_B
Logic
Control
R_Y
BST_
DH
DH
LX_
BBM
V_L
DL
DL
V
Soft-Start
t
SYNC
Rectifier Control
FIGURE 5. Buck Block Diagram (SMPS A and B Controllers)
1.24-V
COMP
SLC
CSP
CSN
Error
Amplifier
-
+
C/S
Amplifier
-
+
100 mV
V
Soft-Start
t
PWM
Comparator
-
+
ON_B
Logic
Control
Pulse
Skipping
Control
-
+
Current Limit
BST_C
DH
LX_C
V_L
DL
FB_C
R₂
R₃
DH_C
DL_C
www.vishay.com
14
FIGURE 6. Buck-Boost Block Diagram (Auxiliary SMPS Controller C)
Document Number: 71841
S-22317—Rev. A, 16-Dec-02