ZXLD1370_11 DIODES [Diodes Incorporated], ZXLD1370_11 Datasheet - Page 26

• Manufacturer Part Number: ZXLD1370_11
• Description: 60V HIGH ACCURACY BUCK/BOOST/BUCK-BOOST LED DRIVER CONTROLLER
• Manufacturer: DIODES [Diodes Incorporated]

ZXLD1370
Document number: DS32165 Rev. 3 - 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:
Table 2
Notes:
In the event of more than one fault/warning condition occurring, the higher severity condition will take precedence. E.g.
‘Excessive coil current’ and ‘Out of regulation’ occurring together will produce an output of 0.9V on the STATUS pin.
If V
reported. Hence, STATUS and FLAG are only guaranteed for V
Normal operation
Supply under-voltage
Output current out of regulation
(Note 11)
Driver stalled with switch ‘on’, or
‘off’ ( Note 12)
Device temperature above
maximum recommended
operating value
Sense resistor current I
specified maximum
ADJ
Warning/Fault condition
>1.7V, V
10. Severity 1 denotes lowest severity.
11. 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
12. This warning will be indicated if the gate pin stays at the same level for greater than 100us (e.g. the output transistor cannot pass enough current
regulation.
to reach the upper switching threshold).
SENSE
may be greater than the excess coil current threshold in normal operation and an error will be
RS
above
(Note 10)
Severity
(Continued)
VREF
0V
0A
4.5V
3.6V
2.7V
1.8V
0.9V
1
2
2
2
3
4
Operations
Normal
0
Figure 34. Status levels
V
t
SHP
ON
VAUX
UVLO
V
1
voltage range
www.diodes.com
parameters
, or t
SENSE
Monitored
V
T
V
outside normal
AUX
J
IN
>125°C
26 of 35
OFF
<5.6V
<5.6V
>0.32V
>100µs
SEVERITY
- VIN UVLO
- STALL
- OUT of REG
ADJ
2
<=V
REF
Temperature
.
Over
FLAG
3
H
L
L
L
L
L
L
Diodes Incorporated
A Product Line of
Current
Over
4
Nominal STATUS voltage
4.5
4.5
3.6
3.6
3.6
1.8
0.9
© Diodes Incorporated
ZXLD1370
February 2011