ISL6745LEVAL2Z Intersil, ISL6745LEVAL2Z Datasheet - Page 6

• Manufacturer Part Number: ISL6745LEVAL2Z
• Description: EVAL BOARD 2 FOR ISL6745
• Manufacturer: Intersil

Specifications of ISL6745LEVAL2Z

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Waveforms
P
The schematic of the ISL6745UEVAL2Z evaluation board is
shown in page 12. The bill of material (BOM) for universal
AC application is shown on page 8. Figure 1 on page 1
shows photographs of the drive board and LED board. The
configuration of the test bench is shown in Figure 12.
To perform the bench testing, the following equipment is
necessary:
• Programmable AC power supply, 275VAC minimum
• Fan to cool heatsinks
• Oscilloscope, 4 channels, 20MHz minimum bandwidth
• DC electronic load, 1A minimum
• DC Multimeter
• Power meter with power factor calculation
UTILITY
erformance
Power Meter
110VAC
TABLE 2. TEST BENCH CONFIGURATION TEST
FIGURE 12. TEST BENCH CONFIGURATION
PM
FIGURE 11A. AROUND INPUT PEAK
PAC
0V ~ 275VAC
ISOLATED
(Continued)
of ISL6745UEVAL2Z
~
CURRENT
PROBE
Digital Multimeter
GATE
~
Vds
PM
DMM
6
LED DRIVER
P1
P2
FIGURE 11. THE GATE SIGNAL AND DRAIN-SOURCE VOLTAGES
P9
P8
50V ~ 58VDC
Programmable AC
DMM
Power Supply
LED BOARD
PAC
Application Note 1411
P4 -
P3 +
When operating the evaluation board, certain precautions
need to be followed.
1. The power stage of the evaluation board has exposed
2. Power source considerations: It is important to choose
3. Loading considerations: It is important to have a firm
4. Air flow conditions: Full rated power should never be
5. When applying power the first time, it is suggested to
6. To measure the output voltage ripple more accurately, it
high voltage and demands extra caution when operating.
The voltage rating of the probes should meet the highest
voltage present in the board. Isolation of the oscilloscope
power source is needed when doing the measurement.
the correct connector when attaching the source supply.
An appropriate AC power supply is needed with
adjustable output voltage (up to 300V) and current (up to
0.5A) with current limit capability.
connection when attaching the load. In case an electronic
load is used instead of the LED board, an appropriate
electronic load with current up to 500mA and voltage up
to 80V is desirable.
attempted without providing the specified 200 CFM of
airflow over the LED board. This can be provided by a
stand-alone fan.
apply light load, and set the current limit of the source
supply to less than 1.5x of the wattage of the load. Start
the circuit with the minimum AC voltage (80V). A quick
efficiency check is the best way to confirm proper
operation.
is suggested to measure as closely as possible to the
converter’s output terminals. Since the AC signal being
measured is small relative to the DC level, care must be
exercised to minimize noise pick-up from external
sources. The bandwidth of the oscilloscope can be set to
20MHz. Use very short and direct connections to the
oscilloscope probe such that the total loop area in the
signal and ground connections is as small as possible.
FIGURE 11B. AROUND INPUT VALLEY
GATE
Vds
June 9, 2009
AN1411.3