TLC5954 Datasheet, PDF (7/45 Pages) Texas Instruments – TLC5954 48-Channel, Constant-Current LED Driver with Global Brightness Control, LED Open-Short Detection, and Power-Save Mode

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TLC5954
SBVS241 – APRIL 2014
Electrical Characteristics (continued)
At T_A = –40°C to +85°C and V_CC = 3.0 V to 3.6 V, unless otherwise noted. Typical values are at T_A = +25°C and V_CC = 3.3 V.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
ΔI_OLC1
Constant-current error
(device-to-device) ⁽³⁾
All OUTXn = on, BCX = 7Fh, V_OUTXn = V_OUTfix = 1 V,
MC = 7h, at same color group (OUTXn)
±0.5%
±3%
ΔI_OLC2
Line regulation⁽⁴⁾
All OUTXn = on, BCX = 7Fh, V_OUTXn = V_OUTfix = 1 V,
MC = 7h, at OUTXn
±0.5
±1
%/V
ΔI_OLC3
Load regulation⁽⁵⁾
All OUTXn = on, BCX = 7Fh, V_OUTXn = 1 V to 3 V,
V_OUTfix = 1 V, MC = 7h, at OUTXn
±1
±3
%/V
(3) The deviation of the OUTXn constant-current average from the ideal constant-current value. Deviation is calculated by the formula:
D (%) =
I_OUTX0 + I_OUTX1 + ... + I_OUTX15
- (Ideal Output Current)
16
Ideal Output Current
´ 100
Ideal current is 34.9 mA for OUTRn and OUTGn. Ideal current is 24.4 mA for OUTBn with MC data equal to 7h.
, where X = R, G, or B, and n = 0 to 15.
(4) Line regulation is calculated by the formula:
(I_OUTXn at VCC = 3.6 V) - (I_OUTXn at VCC = 3.0 V)
100
D (%/V) =
´
I_OUTXn at VCC = 3.0 V
3.6 V - 3.0 V
X = R, G, or B. n = 0 to 15.
(5) Load regulation is calculated by the equation:
(I_OUTXn at V_OUTXn = 3 V) - (I_OUTXn at V_OUTXn = 1 V)
100
D (%/V) =
´
I_OUTXn at V_OUTXn = 1 V
3V-1V
, where X = R, G, or B, and n = 0 to 15.
6.6 Switching Characteristics
At T_A = –40°C to +85°C, V_CC = 3.0 V to 3.6 V, C_L = 15 pF, R_L = 100 Ω for OUTRn and OUTGn, R_L = 150 Ω for OUTBn,
MC = 7h, and V_LED = 4.5 V, unless otherwise noted. Typical values at T_A = +25°C and V_CC = 3.3 V.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
t_R0
Rise time
t_R1
SOUT
OUTXn, BCX = 7Fh⁽¹⁾
t_F0
Fall time
t_F1
SOUT
OUTXn, BCX = 7Fh
t_D0
SCLK↑ to SOUT
t_D1
LAT↑ to OUTR0 on to off or OUTR0 off to on, BCX = 7Fh
t_D2
BLANK↓↑ to OUTR0 on to off or OUTR0 off to on, BCX = 7Fh
t_D3
Propagation delay⁽²⁾
OUTRn on to OUTGn on, OUTGn on to OUTBn on, and OUTBn on to
the next OUTRn on, BCX = 7Fh
2
5 ns
20
50 ns
2
5 ns
20
50 ns
13
23 ns
30
60 ns
30
60 ns
1.5
5 ns
t_D4
OUTRn off to OUTGn off, OUTGn off to OUTBn off, and OUTBn off to
the next OUTRn off, BCX = 7Fh
1.5
5 ns
t_D5
t_{ON_ERR}
Output on-time error⁽³⁾
LAT↑ to power-save mode by writing data for all OUTXn off
OUTXn on or off data = all 1s, BCX = 7Fh, 40-ns BLANK low-level one-
shot pulse input
150
300 ns
–35
35 ns
(1) X = R, G, or B. n = 0 to 15.
(2) t_D3 (OUTRn on to OUTGn on, OUTGn on to OUTBn on, and OUTBn on to the next OUTRn on) and t_D4 (OUTRn off to OUTGn off,
OUTGn off to OUTBn off, and OUTBn off to the next OUTRn off) are calculated by:
t_D3 (ns) = (the propagation delay between OUTR0 on to OUTB7 on) / 47 and
t_D4 (ns) = (the propagation delay between OUTR0 off to OUTB7 off) / 47.
(3) Output on-time error (t_{ON_ERR}) is calculated by the formula: t_{ON_ERR} (ns) = t_{OUT_ON} – BLANK low-level pulse duration.
t_{OUT_ON} is the actual on-time of OUTXn.
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