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LTC4229 Datasheet(PDF) 14 Page - Linear Technology

Part # LTC4229
Description  Ideal Diode and Hot Swap Controller
Download  28 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4229 Datasheet(HTML) 14 Page - Linear Technology

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LTC4229
14
4229f
For more information www.linear.com/LTC4229
applicaTions inForMaTion
In the event of a severe short-circuit fault on the 12V
output as shown in Figure 4, the output current can surge
to tens of amperes. The LTC4229 responds within 1µs to
bring the current under control by pulling the HGATE to
OUT voltage down to zero volts. Almost immediately, the
gate of the Hot Swap MOSFET recovers rapidly due to the
charge stored in the RHG and CHG network, and current
is actively limited until the fault filter times out. Due to
parasitic supply lead inductance, an input supply without
any bypass capacitor may collapse during the high cur-
rent surge and then spike upwards when the current is
interrupted. Figure 13 shows the input supply transient
suppressors consisting of Z1, RSNUB and CSNUB for the
supply if there is no input capacitance.
FTMR Pin Functions
An external capacitor CFT connected from the FTMR pin
to GND serves as fault filtering when the supply output is
in active current limit. When the voltage across the sense
Figure 3. Overcurrent Fault on 12V Output
Figure 4. Severe Short-Circuit on 12V Output
resistorexceedsthefoldbackcurrentlimitthreshold(from
25mV to 8.3mV), FTMR pulls up with 100µA. Otherwise,
it pulls down with 2µA. The fault filter times out when the
1.235V FTMR threshold is exceeded, causing the FAULT
pin to pull low. For a given fault filter delay, the equation
for setting the external capacitor CFT value is:
CFT = tFF • 0.083 [µF/ms]
After the fault filter timeout, the FTMR pin capacitor pulls
down with 2µA from the 1.235V FTMR threshold until it
reaches0.2V.Then,itcompletes14coolingcyclesconsist-
ing of the FTMR pin capacitor charging to 1.235V with a
100µA current and discharging to 0.2V with a 2µA current.
At that point, the HGATE pin voltage is allowed to start up
if the fault has been cleared as described in the Resetting
Fault section. When the latched fault is cleared during the
cool-off period, the FAULT pin pulls high. The total cool-off
time for the MOSFET after an overcurrent fault is:
tCOOL = CFT • 11 [s/µF]
After the cool-off period, the HGATE pin is only allowed
to pull up if the fault has been cleared for the latchoff
configuration.Fortheauto-retryconfiguration,thelatched
fault is cleared automatically following the extended cool-
off period and the HGATE pin voltage is allowed to restart.
Resetting Fault
For the latchoff configuration with the RTMR pin tied to
INTVCC, an overcurrent fault is latched after fault filter
times out, and the FAULT pin is asserted low. To reset a
latched fault and restart the output, pull the UV pin below
0.6V for more than 100µs and then high above 1.235V.
The fault latch resets and the FAULT pin deasserts on the
falling edge of the UV pin. When UV goes high again, a
debounce timing cycle is initiated before the HGATE pin
voltagerestarts.TogglingtheENpinhighandthenlowagain
also resets a fault, but the FAULT pin pulls high at the end
of the debounce cycle before the HGATE pin voltage starts
up. Bringing the supply below the INTVCC undervoltage
lockout threshold (2.2V) shuts off all the MOSFETs and
resets the fault latch. A debounce cycle is initiated before
a normal start-up when the supply is restored above the
INTVCC UVLO threshold.
200µs/DIV
OUT
10V/DIV
HGATE
10V/DIV
ILOAD
20A/DIV
4229 F03
5µs/DIV
OUT
10V/DIV
HGATE
10V/DIV
ILOAD
20A/DIV
4229 F04


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