TLC5944 Datasheet, PDF (5/34 Pages) Texas Instruments – 16-Channel, 12-Bit PWM LED Driver with 6-Bit Dot Correction and Pre-Charge FET

TLC5944
www.ti.com ...................................................................................................................................................................................................... SBVS112 – JUNE 2008
ELECTRICAL CHARACTERISTICS (continued)
At V_CC = 3.0 V to 5.5 V and T_A = –40°C to +85°C. Typical values at V_CC = 3.3 V and T_A = +25°C, unless otherwise noted.
TLC5944
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
ΔI_O(LC3)
R_PCHG
T_(TEF)
T_(HYST)
T_(PTW)
T_(HYSP)
V_LOD
V_IREF
Load regulation⁽⁴⁾
Pre-charge FET on-resistance
Thermal error flag threshold
Thermal error flag hysteresis
Pre-thermal warning threshold
Pre-thermal warning hysteresis
LED open detection threshold
Reference voltage output
All OUTn = ON, DCn = 3Fh, V_OUTn = 1 V to 3 V,
R_IREF = 820 Ω, at OUT0 to OUT15
V_UP = 3 V, V_OUTn = 1 V, BLANK = high,
OUT0 to OUT15
Junction temperature⁽⁵⁾
Junction temperature⁽⁵⁾
Junction temperature⁽⁵⁾
Junction temperature⁽⁵⁾
All OUTn = ON
R_IREF = 820 Ω
+150
+5
+105
+5
0.2
1.16
±1
1
+162
+10
+120
+10
0.3
1.20
±3
%/V
3
kΩ
+175
°C
+20
°C
+135
°C
+20
°C
0.4
V
1.24
V
(4) Load regulation is calculated by the equation:
(%/V) =
D
(I_OUTn at V_OUTn = 3 V) - (I_OUTn at V_OUTn = 1 V)
(I_OUTn at V_OUTn = 1 V)
100
´
3V 1V
-
(5) Not tested. Specified by design.
SWITCHING CHARACTERISTICS
At V_CC = 3.0 V to 5.5 V, T_A = –40°C to +85°C, C_L = 15 pF, R_L = 68 Ω, R_IREF = 820 Ω, V_LED = 5.0 V, and V_UP = 5.0 V. Typical
values at V_CC = 3.3 V and T_A = +25°C, unless otherwise noted.
TLC5944
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNIT
t_R0
Rise time
t_R1
t_F0
t_F1
Fall time
t_F2
t_D0
t_D1
t_D2
t_D3
t_D4
Propagation delay time
t_D5
t_D6
t_D7
t_D8
t_{ON_ERR} Output on-time error⁽¹⁾
SOUT (see Figure 6)
OUTn, DCn = 3Fh (see Figure 5)
SOUT (see Figure 6)
OUTn, DCn = 3Fh (see Figure 5)
XERR, C_{L XERR} = 100 pF, R_{L XERR} = 1 kΩ,
V_XERR = 5 V (see Figure 7)
SCLK↑ to SOUT
DCSEL to SOUT
BLANK↑ to OUT0 sink current off
GSCLK↑ to OUT0/4/8/12
GSCLK↑ to OUT1/5/9/13
GSCLK↑ to OUT2/6/10/14
GSCLK↑ to OUT3/7/11/15
XLAT↑ to IOUT (dot correction)
BLANK↑ to pre-charge FET on, R_{L PRE} = 10 kΩ,
constant current driver off (see Figure 8)
GSn = 001h, GSCLK = 33 MHz
16
ns
10
30
16
ns
10
30
50 ns
25 ns
25 ns
20
40 ns
5
18
40 ns
20
42
73 ns
35
66
106 ns
50
90
140 ns
50 ns
10
35
130 ns
–20
10 ns
(1) Output on-time error is calculated by the following formula: T_{ON_ERR} (ns) = t_OUTON – T_GSCLK. t_OUTON is the actual on-time of the constant
current driver. T_GSCLK is the period of GSCLK.
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