LTC4214 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC4214' PDF : 32 Pages View PDF
LTC4214-1/LTC4214-2
APPLICATIO S I FOR ATIO
Resetting a Fault Latch (LTC4214-1)
The latched circuit breaker fault of LTC4214-1 benefits
from long cooling time. It is reset by pulling the UV pin
below VUVHI – VUVHST with a switch. Reset is also accom-
plished by pulling the VIN pin momentarily below (VLKO –
VLKH). A third reset method involves pulling the TIMER pin
below VTMRL as shown in Figure 14. An initial timing cycle
is skipped if TIMER is used for reset. An initial timing cycle
is generated if reset by the UV pin or the VIN pin.
The duration of the TIMER reset pulse should be smaller
than the time taken to reach 0.2V at SS pin. With a single
pole mechanical pushbutton switch, this may not be
feasible. A double pole, single throw pushbutton switch
removes this restriction by connecting the second switch
to the SS pin. With this method, both the SS and TIMER
pins are released at the same time.
SWITCH RESETS LATCHED TIMER
SWITCH RELEASES SS
1
5µA
VTMRH
2 34
5 67 8 9
TIMER
40µA + 8 • IDRN
VTMRL
5µA
5µA
GATE
50µA
VGATEL
20 • (VACL + VOS)
SS 20 • (VCB + VOS)
20 • VOS
50µA
VIN – VGATEH
SENSE
VACL
VCB
DRAIN
VDRNCL
VDRNL
PWRGD
GATE START-UP
MOMENTARY DPST SWITCH RESET
4214 F14
Figure 14. Pushbutton Reset of LTC4214-1’s Latched Fault (All Waveforms are Referenced to VEE)
421412f
26
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