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LM3017 Arkusz danych(PDF) 11 Page - Texas Instruments

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Numer części LM3017
Szczegółowy opis  High Efficiency Low-Side Controller with True Shutdown
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LM3017
www.ti.com
SNOSC66C – MARCH 2012 – REVISED MARCH 2013
CURRENT LIMIT AND SHORT CIRCUIT PROTECTION
Boost Mode
The LM3017 implements current limit protection by controlling the pass FET, Q2.
In boost mode the LM3017 features both cycle-by-cycle current limit and short circuit protection. Unlike most
boost regulators, the LM3017 can protect itself from short circuits on the output by shutting off the pass FET. The
boost current limit, defined by VCL=170mV in the electrical characteristics table, turns off the boost FET for
normal overloads on a cycle-by-cycle basis. The current is limited to VCL/RSEN until the overload is removed.
Should the output be shorted, or otherwise pulled below VIN, the inductor current will have a tendency to “run-
away”. This is prevented by the short circuit protection feature, defined as VSC = 200mV in the electrical
characteristics table. When this current limit is tripped, the current is limited to VSC/RSEN by controlling the pass
FET. If the short persists for TSC > 450µs the pass FET will be latched off. In this way, the current is limited to
VSC/Rsen until the short is removed or the time of TSC = 450µs is completed. Pulling the EN/MODE pin low
(<0.4V, typ) is required to reset this short circuit latch-off mode. The delay of TSC = 450µs helps to prevent
nuisance latch-off during a momentary short on the output.
Start-up Boost Mode
During start-up in boost mode, peak inductor current may be higher compared to normal operation. To allow for
this, current limit levels and timing are different during startup. The current limit is defined by VLIM2 = 100mV
(typ.) in the electrical characteristics table, for the first TLIM2 = 3.6ms (typ.). The current is limited to VLIM2/RSEN,
for this period . Once the TLIM2 = 3.6ms (typ.) timer has finished, the current limit is increased to VSC = 200mV
(typ.). For the first TLIM2 = 3.6ms (typ.) of the start-up, the latch-off feature is not enabled, however the current will
always be limited to VLIM2/RSEN. This allows the part to start-up normally. If the current limit is still tripped at the
end of TLIM2 = 3.6ms (typ.) , the TSC = 900µs (typ.) timer is started. Once the TSC = 900µs (typ.) time has expired,
the pass FET (Q2) is latched off. This gives a total current-limited time of TSC + TLIM2 = 4.05ms (typ.), in cases
where the LM3017 is started into a short circuit at the output.
Pass-Through Mode
In pass-through mode the power path is protected from shorts and overloads by the current limit defined as VLIM1
= 85mV (typ.) in the electrical characteristics table. When this current limit is tripped, the current is limited to
VLIM1/RSEN by controlling the pass FET. If the short persists for TLIM1 > 900µs (typ.) the pass FET (Q2) will be
latched off. In this way, the current is limited to VLIM1/RSEN until the short is removed or the time of TLIM1 = 900µs
(typ.) is completed. Pulling the EN/MODE pin low (0.4V, typ.) is required to reset this latch-off mode.
Start-up Pass-Through Mode
During start-up in pass mode, the current limit is defined by VLIM2 = 100mV (typ.) in the electrical characteristics
table, for the first TLIM2 = 3.6ms (typ.). The current is limited to VLIM2/RSEN, for this period . Once the TLIM2 =
3.6ms (typ.) timer has finished, the current limit is reduced to VLIM1 = 85mV (typ.). For the first TLIM2 = 3.6ms
(typ.) of the start-up, the latch-off feature is not enabled, however the current will always be limited to VLIM2/RSEN.
This higher limit allows the part to start-up normally. If the current limit is still tripped at the end of TLIM2 = 3.6ms
(typ.), the TLIM1 = 900µs (typ.) timer is started. Once the TLIM1= 900µs time has expired, the pass FET(Q2) is
latched off. This gives a total current-limited time of TLIM1+ TLIM2 = 4.5ms (typ.), in cases where the LM3017 is
started into a short circuit at the output.
Copyright © 2012–2013, Texas Instruments Incorporated
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