Rainbow Electronics MAX1541 - Manual (Page 24)

MAX1540/MAX1541
Dual Step-Down Controllers with Saturation
Protection, Dynamic Output, and Linear Regulator
24 ______________________________________________________________________________________
Figure 2. MAX1540/MAX1541 Functional Diagram
VALLEY
CURRENT
LIMIT
ZERO
CROSSING
SATURATION
LIMIT
VALLEY
CURRENT
LIMIT ZERO
CROSSING SATURATION
LIMIT
*V+
TON
SKIP
ILIM1
CSP1
CSN1
BST1
DH1
LX1
*V DD
DL1
**CC1
GND
LSAT
ILIM2
CSP2
CSN2
BST2
DH2
LX2
*V DD
V CC
DL2
GND
REF
13R
0.7V
7R
CURRENT
LIMIT 1
(FIGURE 5)
CURRENT
LIMIT 2
(FIGURE 5)
PWM
CONTROLLER 1
(FIGURE 3)
PWM
CONTROLLER 2
(FIGURE 3)
FB1 DECODE
(FIGURE 10)
POWER-GOOD AND
FAULT PROTECTION 1
(FIGURE 9)
FB2 DECODE
(FIGURE 10)
INTERNAL
MAX1540/MAX1541
OPTION
POWER-GOOD AND
FAULT PROTECTION 2
(FIGURE 9)
FB1
**REFIN1
OUT1
ON1
PGOOD1
FB2
OUT2
2.0V
REF
ON2
PGOOD2
FAULT1
INT REF1 INT FB1 INT FB2
FAULT2
QUAD-LEVEL
DECODE
QUAD-LEVEL
DECODE AND
TIMER
**FBLANK
**OD
OVP/UVP
BLANK
ENABLE OVP
ENABLE UVP
LINEAR REGULATOR
(FIGURE 13)
*LDOIN
*LDOOUT
**FBLDO
LDOON
**GATE
MAX1541
CONTROLLER 1
ONLY
MAX1540/MAX1541
INT REF2
*FOR THE MAX1540:
LDOIN IS CONNECTED TO V+.
LDOOUT IS CONNECTED TO V
DD .
**MAX1541 CONTROLLER ONLY.