DLPA2000
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ZHCSCO5B –JUNE 2014–REVISED FEBRUARY 2018
6.9 Typical Characteristics
The maximum output current of the buck-boost is a function of input voltage (VIN) and output voltage (VLED). The relationship
between VIN, VLED, and MAX ILED is shown in Figure 4. Note that VLED is the output of the buck-boost regulator, which includes
the voltage drop across the sense resistor RLIM (100 mΩ typical), internal strobe control switch
(75 mΩ max), and the forward voltage of the LED.
Gamma Curves
0.8
0.6
0.4
0.2
0
2
3
4
5
6
VIN(V)
D001
2.3 V < VLED < 4.8 V
Figure 4. Maximum LED Output Current as a Function of
Input Voltage (VIN) and Buck-Boost Output Voltage (VLED
)
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