SI9136_11 Datasheet, PDF (11/16 Pages) Vishay Siliconix – Multi-Output Power-Supply Controller

DETAIL FUNCTIONAL BLOCK DIAGRAM
Si9136
Vishay Siliconix
REF
SLC
Error
-
Amplifier
+
PWMCMP
-
+
Pulse
Skipping
Control
+
1X _-
5/3 ON/OFF_
Logic
Control
20 mV
V
Soft-Start
t
Current
Limit
SYNC
Rectifier Control
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 5. Buck Block Diagram
FBFY
R1
REF
COMP
Error
Amplifier
-
+
PWM
Comparator
-
+
ON/OFF
Logic
Control
BSTY
DH
LXFY
ICSP
ICSN
V
C/S
Amplifier
-
Pulse
Skipping
DL
+
Control
-
100 mV
+
Soft-Start
t
Current Limit
Figure 6. PWM Flyback Block Diagram
R2
DHFY
DLFY
Document Number: 70818
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