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TLED2043 Datasheet, PDF (9/15 Pages) Texas Instruments – 4-CHANNEL WHITE LED DRIVER | |||
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VBATTERY
3.3â4.2 V
TLED2043
4-CHANNEL WHITE LED DRIVER
SLDS147C â JUNE 2002 â REVISED NOVEMBER 2002
TYPICAL CHARACTERISTICS
VREF
(see Note A)
R1
R2
VIN1
VOUT1
VIN2
VOUT2
SW
TLED2043
To Internal Power Supply (VDD)
300 k⦠(TYP)
Vin1
R3
R5
R7
R8
R4
One Of Four
R6
FB
INâ _
_
AMP2
AMP1
+
+
IN+
Current-Control Amplifier
XN1
C1
White LED
D
S
I
R0
R0 = 0.01 kâ¦
R1 = 20 kâ¦
R2 = 1.6 kâ¦
R3 = 20 kâ¦
R4 = 2.2 kâ¦
R5 = 6.8 kâ¦
R6 = 20 kâ¦
R7 = 100 kâ¦
R8 = 100 kâ¦
C1 = 1 µF
VREF = 2.8 V
NOTE A: VREF and resistor values should be chosen for proper control of LED current, which is adjusted by the current-control amplifier
to be directly proportional to the difference between VBATTERY and VREF. A stable VREF can be achieved through a low-power
voltage reference (such as the REF29xx), a shunt regulator (such as the TLV431A), or a low-power LDO (such as the TPS770xx
or TPS769xx families).
Figure 8. Typical Application Circuit
⢠POST OFFICE BOX 655303 DALLAS, TEXAS 75265
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