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LTC4357CMS8-PBF Datasheet(PDF) 8 Page - Linear Technology

Part # LTC4357CMS8-PBF
Description  Positive High Voltage Ideal Diode Controller
Download  12 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4357CMS8-PBF Datasheet(HTML) 8 Page - Linear Technology

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LTC4357
8
4357fb
VDD Hold-Up Circuit
In the event of an input short, parasitic inductance between
the input supply of the LTC4357 and the load bypass
capacitor may cause VDD to glitch below its minimum
operating voltage. This causes the turn-off time (tOFF) to
increase.
To preserve the fast turn-off time, local output bypassing
of 39μF is sufficient at voltages less than 30V. At higher
voltages, 100μF is adequate. As an alternative to local
bypassing, a 100
Ω, 0.1μF RC hold-up circuit on the VDD
pin can be used, shown in Figure 2. In applications with
unusually large inductance or load current greater than
10A, use 100
Ω and 1μF.
Design Example
The following design example demonstrates the calcula-
tions involved for selecting components in a 12V system
with 10A maximum load current (see Figure 3).
Figure 3. 12V, 10A Diode-OR
APPLICATIONS INFORMATION
First, calculate the RDS(ON) of the MOSFET to achieve
the desired forward drop at full load. Assuming VDROP
= 0.1V,
RDS(ON)
VDROP
I LOAD
=
0.1V
10A
RDS(ON) 10m
The Si4874DY offers a good solution, in an S8 package
with RDS(ON) = 10mΩ(max) and BVDSS of 30V.
The maximum power dissipation in the MOSFET is:
P = ILOAD2 • RDS(ON) = (10A)2 • 10mΩ = 1W
With less than 39μF of local bypass, the recommended RC
values of 100
Ω and 0.1μF were used in Figure 3.
Since BVDSS + VIN is much less than 100V, output clamp-
ing is unnecessary.
Figure 2. Two Methods of Protecting Against Collapse
of VDD From Input Short and Stray Inductance
4357 F02
LTC4357
GND
IN
OUT
VDD
GATE
Si4874DY
VIN
12V
R1
100Ω
C1
0.1μF
LTC4357
GND
IN
OUT
VDD
GATE
Si4874DY
VIN
12V
CBYPASS
39μF
4357 F03
LTC4357
GND
IN
OUT
VDD
GATE
Si4874DY
VIN1
12V
VOUT
TO LOAD
LTC4357
GND
IN
OUT
VDD
GATE
Si4874DY
VIN2
12V
100Ω
100Ω
0.1μF
0.1μF


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