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SC5014 View Datasheet(PDF) - Semtech Corporation

Part Name
Description
MFG CO.
'SC5014' PDF : 34 Pages View PDF
SC5014
Table 3 — Fault Protection Descriptions
Type of
Fault
User
Disable?
Fault Criteria
Action on Fault
Device
FLT pin (latching
/ non-latching
Recovery
Condition(s)
FLT pin
Input
No
Under-voltage
VIN < (1 + R2/R1)
x 1.23 (rising)
at VIN
(UVLO)
No
VIN < (1 + R2/R1) × 1.23V - IUVLO
× R1 (falling)
Input
No
Under-volt-
age at VCC
(UVLO)
No
VCC < 4.2V
(rising)
VCC < 4.0V
(falling)
No Startup
Shutdown
No Startup
Shutdown
Not Active
Not Active
Not Active
Not Active
VUVLO > 1.23V
(rising)
VUVLO > 1.23V
(rising)
VCC > 4.2V
(rising)
VCC > 4.2V
(rising)
High
High
High
High
Over-voltage
Protection
No
(OVP)
Over-current
Protection
No
(OCP)
Shorted
LED(s)
Yes, tie
SCP to
VCC
Open
LED(s)
No
Unused Strings No
VOVP > 1.23V
(rising)
VCS > 0.4V
VIO(n) > 20 x VSCP
VIO(All) > 20 x VSCP
VIO(n) < 0.1V
and OVP event
VIO(All) < 0.1V
and OVP event
VIO(All) < 0.1V
(start up)
Regulate to OVP
threshold:
IO(n) = “on”
Limit Q1 FET drain
current < 0.4V/R9
(typ) (1)
Device on:
IO(n) = “off ”
Other IO(All) = “on”
Device latch-off;
IO(All) = “off ”
Device on:
IO(n) = “off ”
Other IO(All) = “on”
Device latch-off;
IO(All) = “off ”
Device on:
IO(n) = “off ”
Other IO(All) = “on”
Low
(non-latching)
VOVP < 1.22V
(falling)
High on re-
moval of fault
condition
High
Low
(latching)
Low
(latching)
Low
(latching)
Low
(latching)
VCS > 0.4V
Replace Shorted
LED(s) and Toggle
EN, VCC or UVLO
Replace Shorted
LED(s) and Toggle
EN, VCC or UVLO
Replace Open
LED(s) and Toggle
EN, VCC or UVLO
Replace Open
LED(s) and Toggle
EN, VCC or UVLO
High
High
High
High
High
High
Over-Tempera-
ture Protection No
(OTP)
TJ > 150ºC (typ)
Device off;
IO(All) = “off ”
Low
(latching)
Satisfy THYS > 10ºC;
Device On;
IO(All) = “on”;
Toggle EN, VCC or
High
Note: Refer to the application circuit example for R1 and R2 on page 23, Figure 2.
18
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