STEVAL-ILL027V1 STMicroelectronics, STEVAL-ILL027V1 Datasheet - Page 11
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STEVAL-ILL027V1
Manufacturer Part Number
STEVAL-ILL027V1
Description
BOARD EVAL LED DRIVER FOR L6562A
Manufacturer
STMicroelectronics
Datasheets
1.L6562ADTR.pdf
(26 pages)
2.STEVAL-ILL027V1.pdf
(4 pages)
3.STEVAL-ILL027V1.pdf
(23 pages)
Specifications of STEVAL-ILL027V1
Design Resources
STEVAL-ILL027V1 Schematics STEVAL-ILL027V1 BOM STEVAL-ILL027V1 Gerber Files
Current - Output / Channel
260mA
Outputs And Type
1, Non-Isolated
Voltage - Output
70V
Features
Short-Circuit Protection
Voltage - Input
120VAC
Utilized Ic / Part
L6562A
Product
Display Modules
Lead Free Status / RoHS Status
Lead free by exemption / RoHS compliant by exemption
Other names
497-10170
AN3111
Figure 7.
Figure 8.
LED voltage and LED current
Figure 8
than the output voltage, zero voltage turn-on is achieved. When the input voltage is higher
than the output voltage, the MOSFET is turned on at reduced voltage.
Fault conditions:
1.
If the LED string is disconnected from the circuit, the output capacitor can be charged to
a very high voltage if there is no overvoltage protection. The protection threshold voltage
Vovp is set as 75 V. R7 and R10 sense the reflected voltage through the coupled inductor
with a 4 to 1 turn ratio (N). The error amplifier of the L6562A is used to shut down the chip if
overvoltage is detected.
Switching waveform of MOSFET
Q1: conclusions when Vout > Vin
Open load
and
9
show the MOSFET switching waveforms. When the input line voltage is lower
Doc ID 16815 Rev 2
Figure 9.
Switching waveform of MOSFET
Q1: conclusions when Vout < Vin
Circuit design
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