Rainbow Electronics MAX1541 - Manual (Page 43)

MAX1540/MAX1541
Dual Step-Down Controllers with Saturation
Protection, Dynamic Output, and Linear Regulator
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Figure 17. Voltage Positioning
MAX1540
MAX1541
C2
VOLTAGE-POSITIONED
OUTPUT (V
OUT(VPS) )
C OUT
INPUT (V
IN
)
+5V BIAS
SUPPLY
D BST
C
BST L1 R SENSE
N H
N L
C IN
V CC
V DD
FB
V OUT(VPS) = V OUT(NO LOAD) - R SENSE I OUT
CSN_
OUT_
CSP_
GND
DL_
DH_
BST_
V+
C1
R1
LX_
D L
Figure 18. Voltage-Positioning Transient Response
B
50mV/div
1.4
1.4
A
A. CONVENTIONAL CONVERTER
B. VOLTAGE-POSITIONED OUTPUT
VOLTAGE POSITIONING THE OUTPUT
V OUT
ESR VOLTAGE STEP
(I STEP x R ESR )
CAPACITIVE SOAR
(dV/dt = I OUT /C OUT )
RECOVERY
CAPACITIVE SAG
(dV/dt = I OUT /C OUT )
I
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