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LTC4413 Datasheet(PDF) 25 Page - Analog Devices

Part # LTC4413
Description  High Power Prioritized PowerPath Controller
PDF  32 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LTC4413 Datasheet(HTML) 25 Page - Analog Devices

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LTC4421
25
Rev. 0
For more information www.analog.com
Design Example
As a design example, take the following specifications for
the circuit in Figure 14. For simplicity, the same specifica-
tions and hence the same component values are used for
each channel. The application is rated for an input voltage
of 12V, maximum output load current of 8A, UV rising =
11V, UV falling = 8V, OV Rising = 15V and maximum output
voltage drop during switchover = 1.2V (10% of the input
supply voltages). The minimum and maximum operating
ambient temperatures are –40°C and 85°C, respectively.
Start by setting the current limit to 16A, so that the out-
put voltage can be charged at full DC load conditions in
a reasonable amount of time as shown by Equation 18
(from Equation 6).
R
SENSE =
25mV
16A
= 1.5625mΩ
(18)
APPLICATIONS INFORMATION
The nearest standard value sense resistor is 1.5mΩ,
which results in a current limit of 16.7A.
Choose an electrolytic output capacitor having
RESR = 50mΩ. During switchover is given by Equation 19
(from Equation 8).
V
STEP = (8A • 50mΩ) = 400mV
(19)
To keep the total output voltage drop during switchover
to less than 1.2V, the maximum droop must be ≤ 800mV.
Therefore is given by Equation 20 (from Equation 9).
C
OUT ≥
8A • 15µs
(
)
800mV
= 150µF
(20)
so we choose COUT = 220µF for margin.
Figure 14. Dual 12V, 8A Application Circuit for Design Example
CINTVCC
1µF
CTMR2
6.8nF
CTMR1
6.8nF
CQUAL
1nF
931k
R4
RSN1
1.2
CSN1
10µF
16.9k
R3
12.1k
R2
33.2k
R1
931k
R8
16.9k
R7
12.1k
R6
33.2k
R5
C2
0.1µF
M1
PSMN4R060YS
M2
PSMN1R440YLD
ILIM1 = 16.7A
ILIM2 = 16.7A
M3
PSMN4R060YS
M4
PSMN1R440YLD
CCP0
1µF
COUT
220µF
1.5m
RSENSE1
1.5m
RSENSE2
EXTVCC
INTVCC
TMR1
OV1
OV2
VALID1
VALID2
GND
FAULT1
FAULT2
CH1
CH2
DISABLE1
DISABLE2
SHDN
UVF1
UVF2
UVR1
UVR2
TMR2
CASIN
CASOUT
QUAL
RETRY
47nF
CG1
CG2
47nF
D1
SMBJ24CA
D2
SMBJ24CA
PRIMARY
12V
VOUT
8A
SECONDARY
12V
LTC4421
LTC4421 F14
DIGITAL
STATUS
OUTPUTS
DIGITAL
CONTROL
INPUTS
VUVFALL1 = 8V
VUVRISE1 = 11V
VOVRISE1 = 15V
VUVFALL2 = 8V
VUVRISE2 = 11V
VOVRISE = 15V
RSN2
1.2
CSN2
10µF
GATE1 SOURCE1
OUT2
GATE2 SOURCE2
V1
V2
CPO
SENSE1
SENSE2
OUT1
CPOREF



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