Rainbow Electronics MAX799 - Manual (Page 14)

MAX796/MAX797/MAX799
Step-Down Controllers with
Synchronous Rectifier for CPU Power
14 ______________________________________________________________________________________
SHOOT-
THROUGH
CONTROL
R
Q
30mV
R Q
LEVEL
SHIFT
1 µ s
SINGLE-SHOT
1X
MAIN PWM
COMPARATOR
OSC
LEVEL
SHIFT
CURRENT
LIMIT
VL
24R
1R 2.5V
4 µ A
SYNCHRONOUS
RECTIFIER CONTROL
REF
SS
SHDN
–100mV
NOTE 1
CSH
CSL
FROM
FEEDBACK
DIVIDER
BST
DH
LX
VL
DL
PGND
S
S
SLOPE COMP
N
SKIP
(MAX797
ONLY)
REF (MAX796)
GND (MAX799)
MAX796, MAX799 ONLY
SECFB
NOTE 1: COMPARATOR INPUT POLARITIES
ARE REVERSED FOR THE MAX799.
Figure 3. PWM Controller Detailed Block Diagram