DB62 Datasheet, PDF (3/6 Pages) Cirrus Logic – DEMONSTRATION BOARD FOR SA305EX

EVALUATION KIT FOR
SA305EX
DB62
SPECIAL CONSIDERATIONS
a) 6 schottky diodes D1-D6 (2 for each output provided with
DB62) are recommended for use as external flyback diodes
because of superior reverse recovery characteristics. Please
note that in the DB62, jumpers are needed in order to con-
nect the external schottky diodes (see EVAL49 layout).
b) External RC snubber circuits (R13 and C5, R16 and C8,
R19 and C10 in EVAL49 schematic) can provide noise
immunity especially in high load current scenarios. A 100
V 4.7nF capacitor in series with a 50 ohm 5W resistor
(provided with kit) is recommended for the snubber to be
connected between each output and PGND.
The power dissipated in the snubber components can be
estimated by;
P = V2 • C • FSW
Where
P is the power dissipated
V is the VS supply voltage
C is the snubber capacitor value (15nF)
FSW is the switching frequency.
GROUNDING CONSIDERATIONS
The EVAL49 has three separate ground paths for signal
ground (SGND), power ground (PGND) and digital ground
(DGND). SGND and PGND are the ground paths for the
SA305 while the DGND is for the MCU and related circuitry.
These grounds need to be connected on the board by putting
a jumper between SGND and DGND and another between
PGND and DGND. These jumpers are located in the center
of the board on the right of the SA305. Do not connect the
grounds at any other points to avoid ground loops and un-
wanted voltage drops.
PARTS LIST
Apex Part #
EVAL49
Description, Vendor Qty
PC Board, Apex
1
OX7R105KWN
1µF Cap, Novacap
4
MS06
Pin Socket
1
MS11
Socket Strip
1 Bag
(Black) 151-203-RC
Test Point
3
Mouser
(White) 151-201-RC
Test Point
5
Mouser
110-13-328-41-001000 DIP28 Socket
1
Mill-Max
(White) 571-0600
4mm single PCB socket 16
Deltron
(Red) 571-0500
4mm single PCB socket 3
Deltron
(Black) 571-0100
ECG-EVQPAC07K
3352W-1-102
50SQ100
140-ESRL100V100
MCU-305
CFRN60D1001FRE6
RN60D4701FB14
CFI-4C1R0J
RN60D2000FB14
WP63GD
4mm single PCB socket 3
Deltron
Push Button Switch,
3
Panasonic
Potentiometer,
2
Bourns
Schottky Diodes,
6
International Rectifier
100uF cap,
2
Xicon
PIC18F2331-1/SP-ND 1
Microchip
1K Ohm Resistor,
3
(R23,R24.R25)
5% 0.25W
4.7K Ohm Resistor,
4
(R1, R2, R3, R6)
5% 0.25W
1 Ohm Resistor,
2
(R5, R10)
5% 0.25W
200 Ohm Resistor,
6
(R17, R18, R20,
R21, R22, R26)
5% 0.25W
Green LED's,
5
(D8-D12)
WP631D
Red LED, (D7)
1
(Optional Components: Refer to SA305U for details)
Apex Part #
HWRE06
Description, Vendor Qty
Includes the following:
HS32
Heatsink,
1
Apex
CLAMP05
Clip,
1
Apex
TW12
Thermal Washer,
Apex
1 Box
C062K472K2X5CA
4.7 nF Capacitor,
3
Kemet
286-51-RC
50 ohm 5W resistor,
3
Xicon
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