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AN4382 Scheda tecnica(PDF) 23 Page - STMicroelectronics

Il numero della parte AN4382
Spiegazioni elettronici  100 W LED street lighting application using STLUX385A
PDF  70 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4382 Scheda tecnica(HTML) 23 Page - STMicroelectronics

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AN4382
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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