SI9135_11 Datasheet, PDF (11/16 Pages) Vishay Siliconix – SMBus Multi-Output Power-Supply Controller

DETAILED FUNCTIONAL BLOCK DIAGRAMS
+
1X
REF
SLC
V
Error
−
Amplifier
+
PWMCMP
−
+
Pulse
Skipping
Control
20 mV
Current
Limit
SMBUS Control
Logic
Control
Soft-Start
t
SYNC
Rectifier Control
Si9135
Vishay Siliconix
FB₅
CS_
FB_
BST_
DH
DH
R_{X Internal voltage}
divider is only
used on 5 V
R_Y output.
LX_
BBM
V_L
DL
DL
Figure 3. Buck Block Diagram
REF
COMP
Error
Amplifier
−
+
SMBUS Control
PWM
Comparator
−
Logic
+
Control
BSTY
DH
LXFY
C/S
Amplifier
ICSP
−
Pulse
Skipping
DL
ICSN
+
Control
−
100 mV
+
V
Soft-Start
t
Current Limit
Figure 4. PWM Flyback Block Diagram
FBFY
R1
R2
DHFY
DLFY
Document Number: 70817
www.vishay.com
S11-0975-Rev. D, 16-May-11
11
This document is subject to change without notice.
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000