ZXLD1371EST16TC Diodes Inc. / Zetex, ZXLD1371EST16TC Datasheet - Page 36

• Manufacturer Part Number: ZXLD1371EST16TC
• Description: MOSFET LED Controller TSSOP TSSOP-16EP T&R 2.5K
• Manufacturer: Diodes Inc. / Zetex

Specifications of ZXLD1371EST16TC

• Rohs: yes

ZXLD1371
Document number: DS35436 Rev. 1 - 2
Applications Information
FLAG/STATUS Outputs
The FLAG/STATUS outputs provide a warning of extreme operating or fault conditions. FLAG is an open-drain logic
output, which is normally off, but switches low to indicate that a warning, or fault condition exists. STATUS is a DAC
output, which is normally high (4.5V), but switches to a lower voltage to indicate the nature of the warning/fault.
Conditions monitored, the method of detection and the nominal STATUS output voltage are given in the following table
(Note 15):
Table 2
Notes:
Normal operation
Supply under-voltage
Output current out of regulation
(Note 17)
Driver stalled with switch ‘on’, or
‘off’ (Note 18)
Device temperature above
maximum recommended
operating value
Sense resistor current I
specified maximum
Warning/Fault condition
15. These STATUS pin voltages apply for an input voltage,V
16. Severity 1 denotes lowest severity.
17. This warning will be indicated if the output power demand is higher than the available input power; the loop may not be able to maintain
18. This warning will be indicated if the gate pin stays at the same level for greater than 100µs (e.g. the output transistor cannot pass enough current
may not report the correct status. For 5.4V < V
an over-current status may be indicated when operating at high boost ratios -– this due to the feedback loop increasing the sense voltage.
regulation.
to reach the upper switching threshold).
RS
above
(Note 16)
Severity
(cont.)
1
2
2
2
3
4
IN
Figure 15. Status levels
V
< 7.5V the flag pin still reports an error by going low. At low V
t
ON
SHP
V
voltage range
, or t
www.diodes.com
V
parameters
SENSE
T
Monitored
V
AUX
outside normal
IN
J
IN
, of 7.5V < V
> 125°C
OFF
36 of 42
< 5.6V
< 5.0V
> 0.3V
> 100µs
IN
< 60V. Below 7.5V the STATUS pin voltage levels reduce and therefore
FLAG
H
L
L
L
L
L
L
Diodes Incorporated
A Product Line of
Nominal STATUS voltage
IN
in Boost and Buck-boost modes
< 3.6V
4.5V
4.5V
3.6V
3.6V
1.8V
0.9V
© Diodes Incorporated
February 2012
ZXLD1371