TPS75103 Datasheet, PDF (7/19 Pages) Texas Instruments – Low Dropout, Two-Bank LED Driver with PWM Brightness Control

TPS7510x
www.ti.com
SBVS080H – SEPTEMBER 2006 – REVISED JANUARY 2010
TYPICAL CHARACTERISTICS
Over operating junction temperature range (T_J = –40°C to +85°C), V_IN = 3.8V, DxA and DxB = 3.3V, R_SET = 32.4kΩ, and ENA
and ENB = high, unless otherwise noted. Typical values are at T_A = +25°C.
LED CURRENT vs DUTY CYCLE (f = 300Hz)
LINE TRANSIENT (600mV Pulse)
25
20
3.9V
15
1V/div
3.6V
V_IN
10
0.5mA/div
I_OUT
5
0
0 10 20 30 40 50 60 70 80 90 100
Duty Cycle (%)
Figure 1.
LINE TRANSIENT (300mV Pulse)
20ms/div
Figure 2.
DIMMING RESPONSE (Both Channels)
1V/div
3.6V
3.3V
V_IN
1V/div
0.4V
1.2V
ENA = ENB
0.5mA/div
20mA/div
I_OUT
I_OUT
20ms/div
Figure 3.
DIMMING RESPONSE (Single Channel)
ENA = 3.8V
1V/div
0.4V
1.2V
ENB
20mA/div
I_OUT
20ms/div
Figure 5.
20ms/div
Figure 4.
OUTPUT CURRENT vs HEADROOM VOLTAGE
25
20
-40°C
15
+25°C
10
+85°C
5
0
0 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20
V_IN - V_OUT (V)
Figure 6.
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