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AN4461 bảng dữ liệu(PDF) 23 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  100 W LED street lighting application using STLUX385A
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AN4461 bảng dữ liệu(HTML) 23 Page - STMicroelectronics

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AN4461
ZVS LC resonant stage description
70
Figure 11. Half-bridge logical implementation
The control stage algorithm of the half-bridge resonator makes sure that the half-bridge is
always driven at the correct frequency so that the amount of current sensed (CPP3)
matches the target current (Iref) as selected by the user via the DALI, UART or the 0/10
interface.
The high precision signal generated by the PWM2 is used as a comparison with the actual
current.
The control loop bandwidth is 10 KHz. The minimum allowed frequency is 70 KHz and
maximum frequency is 400 KHz.
The STLUX385A limits the resonant output current increases or decreases rate to
a maximum of 300 mA /second, in order to preserve both the output capacitors and the LED
string.



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