Datasheet

STP24DP05 Features description
Doc ID 14714 Rev 5 15/27
7 Features description
7.1 DG: gradual output delay
This feature prevents large inrush current and reduces the bypass capacitors.
The fixed delay time can be activated with DG = LOW and the typical output delay is 30 ns
for each group of 8 outputs, R, G, and B. E.g.: R1, G1, B1 has no delay, R2, G2, B2 has 30
ns delay and R3, G3, B3, has 60 ns delay, etc.
7.2 Error detection condition
Note: I
O
= the output current programmed by the R
EXT
I
ODEC
= the detected output current in detection mode
Table 9. Typical gradual delay time table
Delay time (ns) from ↓OExx
R1
G1
B1
R2
G2
B2
R3
G3
B3
R4
G4
B4
R5
G5
B5
R6
G6
B6
R7
G7
B7
R8
G8
B8
DG = 0 0 30 60 90 120 150 180 210
DG = 1 0000000
Table 10. Detection conditions (V
DD
= 3.3 to 5 V, I
O
= 20 mA, t
A
= 25 °C)
SW-1 Open
or SW-3b
Open line or output short
to GND detected
=> I
ODEC
≤ 0.4 x I
O
No error
detected
=> I
ODEC
≥ 0.35 x I
O
SW-2
Closed or
SW-3a
Short on LED or short to
V-LED detected
=> V
O
≥ 2.6 V
No error
detected
=> V
O
≤ 2.4 V
Table 11. Typical current threshold values to detect LED open line
Iset (mA) Rext (Ω) Typ. out current detection (mA)
5 3920 1.28
10 1960 2.45
20 980 7.4
50 386 17
80 241 27