TLC5926-Q1_16 Datasheet, PDF (14/36 Pages) Texas Instruments – TLC592x-Q1 16-Channel Constant-Current LED Sink Drivers

TLC5926-Q1, TLC5927-Q1
SLVS973A – SEPTEMBER 2009 – REVISED JULY 2015
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9.3 Feature Description
9.3.1 Open-Circuit Detection Principle
The LED Open-Circuit Detection compares the effective current level I_OUT with the open load detection threshold
current I_OUT,Th. If I_OUT is below the I_OUT,Th threshold, the TLC592x-Q1 detects an open-load condition. This error
status can be read as an error status code in the Special mode. For open-circuit error detection, a channel must
be on.
STATE OF OUTPUT PORT
Off
On
(1) I_OUT,Th = 0.5 × I_OUT,target (typical)
Table 1. Open-Circuit Detection
CONDITION OF
OUTPUT CURRENT
I_OUT = 0 mA
I_OUT < I_OUT,Th ⁽¹⁾
I_OUT ≥ I_OUT,Th ⁽¹⁾
ERROR STATUS CODE
0
0
1
MEANING
Detection not possible
Open circuit
Normal
9.3.2 Short-Circuit Detection Principle (TLC5927-Q1 Only)
The LED short-circuit detection compares the effective voltage level V_OUT with the shorted-load detection
threshold voltages V_OUT,TTh and V_OUT,RTh. If V_OUT is above the V_OUT,TTh threshold, the TLC5927-Q1 detects a
shorted-load condition. If the V_OUT is below V_OUT,RTh threshold, no error is detected and the error bit is reset. This
error status can be read as an error status code in the Special mode. For short-circuit error detection, a channel
must be on.
STATE OF OUTPUT PORT
Off
On
Table 2. Short-Circuit Detection
CONDITION OF
OUTPUT VOLTAGE
I_OUT = 0 mA
V_OUT ≥ V_OUT,TTh
V_OUT < V_OUT,RTh
ERROR STATUS CODE
0
0
1
MEANING
Detection not possible
Short circuit
Normal
No Fault
Minimum
Return
Threshold
Minimum
Trigger
Threshold
Maximum
Trigger
Threshold
Short Fault
1.9 V
V_OUT,RTh
2.3 V
V_OUT,TTh
Figure 7. Short-Circuit Detection Principle
3.2 V
V_OUT
14
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