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Table 3 : Bill of Materials - Source Board
Item Qty Reference Part Description
1 2 C14, C15 120pF 250V
29
C20, C30, C32, C33, C50, C52, C71,
C78, C94 100nF, 50V
3 1 C21 4.7uF, 25V
4 1 C31 47pF 50V
5 1 C34 12pF, 50V
6 1 C35 10nF, 50V
7 2 C40, C41 10uF 35V
8 4 C53, C54, C90, C91 1uF, 25V
9 1 C70 10pF 50V
10 2 C92, C93 22nF, 25V
11 2 D10, D11 Schottky 40V 30mA
12 1 D50 Schottky 40V 1A
13 2 J10, J61 3pin .1" Male Vert.
14 1 J44 1pin .1" Male Vert.
15 3 J60, J62, J90 2pin .1" Male Vert.
16 1 J71 SMA vertical Socket
17 1 J72 SMB vertical Jack
18 2 Q40, Q41 40V 10A 16mE
19 1 R14 150E
20 1 R15 240E
21 4 R16, R17, R402, R405 0E
22 3 R18, R19, R32 DNP
23 1 R30 10k
24 1 R33 1k
25 2 R35, R36 4k7
26 1 R38 100E
27 1 R50 1E
28 4 R70, R71, R73, R74 12k
29 2 R400, R403 2E2
30 2 R401, R404 4E7
31 3 SJ40, SJ41, SJ42 5mm Scope Jack
33 1 SW60 SPST push button 42V 0.1A
34 1 U20 100V eGaN Driver
35 2 U30, U31 15ns Comparator
36 2 U50, U90 5.0V 250mA DFN
37 1 U70 7.3728MHz CMOS Osc 5V
38 1 U92 2.5V 5mA Ref
39 1 Cl1 Source Coil
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5. Make sure the jumper (J61) is in the internal feedback posi-
tion (default 1-2)
6. Turn on the control supply – make sure the supply is between
7 V and 12 V range (8.5 V is recommended).
7. Turn on the main supply voltage to the required value (do
not exceed the absolute maximum voltage of 24 V on VOUT).
To ensure that the circuit starts, it is recommended to start at
8 V and increase or decrease to the desired value.
8. If the unit does not self-start in step 7, then press the start
button and hold for at least 2 seconds. Observe that the sys-
tem operates on its own once the button has been released.
Pressing the start button will connect the internal oscillator
to the feedback circuit to help establish the currents and
voltages in the system to function on its own upon release
of the start button. The internal oscillator is set to 7.372 MHz
(well above the operating point) and it may be necessary to
increase the voltage or reduce the load to start the circuit.
9. Once operational, adjust the main supply voltage and load
within the operating range and observe the output switch-
ing behavior, eciency and other parameters.
10. For shutdown, please follow steps in the reverse order. Start
by reducing the main supply voltage to 0 V followed by steps
6 through 2.
