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ZXLD1350EV2
ZXLD1350EV2 User Guide Iss 5 10-04-07
PERFORMANCE
The system efficiency depends on the sense resistor, supply voltage, switching inductor and the number of 1W LEDs
connected in series.
The graph below shows the efficiency with a 0.33Ω sense resistor R
S,
and a 100uH inductor, for 1 to 3 series
connected 1W LEDs.
With a 24V supply, the switching frequency is typically 545kHz for three series-connected 1-watt LEDs and 300kHz
for a single 1-watt LED.
With a 12V supply, the switching frequency is typically 160kHz for three series-connected 1-watt LEDs and 280kHz
for a single 1-watt LED
The detailed performance information for the device can be found in the datasheets.
Efficiency vs Vin
Rsense=0.33 Ohms, L=100uH (NIC NPIS53D101MTRF)
95
90
Figure 6: Efficiency vs supply voltage
75
80
85
0 5 10 15 20 25 30 35
Vin (V)
Eff (%)
1 LED
2 LED
3 LED