ZXLD1350EV2
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 RS, and a 100uH inductor, for 1 to 3 series connected 1W LEDs.
With a 24V supply, the switching frequency is typically 545kHz for three
With a 12V supply, the switching frequency is typically 160kHz for three
The detailed performance information for the device can be found in the datasheets.
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| Efficiency vs Vin |
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| Rsense=0.33 Ohms, L=100uH (NIC NPIS53D101MTRF) |
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95 |
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90 |
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Eff (%) |
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| 1 LED |
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85 |
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| 2 LED |
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| 3 LED |
80 |
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75 |
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0 | 5 | 10 | 15 | 20 | 25 | 30 | 35 |
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| Vin (V) |
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Figure 6: Efficiency vs supply voltage
ZXLD1350EV2 User Guide Iss 5 |
