TLED2043 Datasheet, PDF (9/16 Pages) Texas Instruments – 4-CHANNEL WHITE LED DRIVER

VBATTERY
3.3–4.2 V
TLED2043
4-CHANNEL WHITE LED DRIVER
SLDS147C – JUNE 2002 – REVISED NOVEMBER 2002
TYPICAL CHARACTERISTICS
VREF
(see Note A)
R1
R2
VIN1
VOUT1
VIN2
VOUT2
SW
TLED2043
To Internal Power Supply (VDD)
300 kΩ (TYP)
Vin1
R3
R5
R7
R8
R4
One Of Four
R6
FB
IN– _{_}
_
AMP2
AMP1
+
+
IN+
Current-Control Amplifier
XN1
C1
White LED
D
S
I
R0
R0 = 0.01 kΩ
R1 = 20 kΩ
R2 = 1.6 kΩ
R3 = 20 kΩ
R4 = 2.2 kΩ
R5 = 6.8 kΩ
R6 = 20 kΩ
R7 = 100 kΩ
R8 = 100 kΩ
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
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