Atmel 8-bit AVR Microcontrollers AVR430: MC300 User Manual page 12

4.5 Upgrading the MC300
4.5.1 Voltage limitations
4.5.2 Current limitations
4.5.3 Additional decoupling capacitors on Vm
AVR430
12
As the board is shipped, its limitations are Vm
be increased by replacing the relevant components (not included).
If a Vm higher than 40V is required, then some components must be changed on
max
the board. Components limiting Vm, listed with lowest voltage ratings first, are shown
in Table 4-1.
Table 4-1. Components influenced by Vm.
Component designator(s)
Q3, Q4, Q5, Q6, Q7, Q8, Q9 & Q10
C10, C19, C26 & C33
Q2
C14
D8, D12, D13 & D14
D9
D11
C7
R7
The integrated bridge drivers (IR2101S) can handle up to 600V, but the layout of the
PCB (spacing between tracks) should be considered before operation at high
voltages.
If filters/dividers for Vm, U, V, W, or X have been mounted, verify that they can handle
Vm.
For an Im > 5A, use power connector J3 and not DC-Jack J5. If an Im
6A is required, components listed in Table 4-2 are affected.
Table 4-2. Components conducting Im.
Component designator(s)
R62
J3 & J7
Q3, Q4, Q5, Q6, Q7, Q8, Q9 & Q10
Notes: 1. The pad/track area around R62 is not 300mm2 as required by datasheet for
handling 2W. Reducing P to 1,8W gives I
The board has provision for some extra decoupling capacitors on Vm. They are found
close to the MOS bridges (C11, C12, C20, C21, C27, C28, C34 and C35), and one
close to the power input (C13).
=40V and Im
max
Component name Limiting parameter
IRFR3504 V
DSS
100nF V
max
2N7002 V
DSmax
47uF/63V V
max
BAS16 V
RRM
10MQ100N V
RRM
12CWQ10FN V
RRM
10nF V
max
100kOhm Pmax = 0.1W -> Vm = 108V
Component name Limiting parameter
50mOhm 2W I
max
MC1,5/x-G-3,81 I
max
IRFR3504 I = 30A
D
= sqrt(P/R) = 6,0A.
max
=6A. These limits can
max
= 40V
= 50V
= 60V
= 63V
= 85V
= 100V
= 100V
= 100V [2]
larger than
max
(1)
= sqrt(P/R) = 6,0A
= 8A
8124C-AVR-10/08