P
PeteS
- Jan 1, 1970
- 0
[email protected] wrote:
why sir???dnt we hv any chip for this ??
[ Middle posting
]
What you apparently want is to go from 20V (whether AC or DC has not
been specified] to 3 outputs:
+5V, +12V and -12V
Assuming it's 20Vdc in, there may be triple supply switchers out there
that can do buck and invert in the same device, but I personally don't
know of any (and I don't feel ike looking through catalogues on Sunday
either).
Alternatively, you would be looking for a dual linear with a switched
cap inverter (not a particularly good choice for precision electronics,
incidentally), and once more I don't know of any.
Given that using switchers will necesssarily increase your component
count by a minimum of two inductors, you would be better off using 3
devices with the associated input and output caps (which you will need
with any supply).
If your input is AC, you'll need a rectifier in front of it as well (as
all the others here could tell you).
Txltn:
Wht u apprntly wnt is 2 go frm 20V (whthr AC or DC hs nt bn spcfd] 2 3
otpts:
+5V, +12V -12V
Assmn it's 20Vdc in, thr my be trpl spply swtchrs avlbl that cn do bck
and nvrt in th sm dvc, but I prsnlly dnt knw of ny (nd I dnt fl lk lkng
thru catlgs on Sndy ethr).
Altrntivly, u wld be lkng 4 a dl lnr with a swtchd cap nvrtr (nt a
prticly gd chce for prcsn lctrncs, ncdntly), nd once mre I dnt knw of
ny.
Gvn tht usng swtchrs wll ncsarly incrs ur cmpnt cnt by a mn of 2
ndctrs, u wld be bttr ff usn 3 dvcs with th assctd npt nd otpt caps
(whch u wll nd wth an spply).
If ur npt is AC, u'll nd a rctfr in frnt of it as wll (as ll th othrs
hre cld tll u).
Cheers
PeteS
(Practicing language skills)
why sir???dnt we hv any chip for this ??
[ Middle posting
]What you apparently want is to go from 20V (whether AC or DC has not
been specified] to 3 outputs:
+5V, +12V and -12V
Assuming it's 20Vdc in, there may be triple supply switchers out there
that can do buck and invert in the same device, but I personally don't
know of any (and I don't feel ike looking through catalogues on Sunday
either).
Alternatively, you would be looking for a dual linear with a switched
cap inverter (not a particularly good choice for precision electronics,
incidentally), and once more I don't know of any.
Given that using switchers will necesssarily increase your component
count by a minimum of two inductors, you would be better off using 3
devices with the associated input and output caps (which you will need
with any supply).
If your input is AC, you'll need a rectifier in front of it as well (as
all the others here could tell you).
Txltn:
Wht u apprntly wnt is 2 go frm 20V (whthr AC or DC hs nt bn spcfd] 2 3
otpts:
+5V, +12V -12V
Assmn it's 20Vdc in, thr my be trpl spply swtchrs avlbl that cn do bck
and nvrt in th sm dvc, but I prsnlly dnt knw of ny (nd I dnt fl lk lkng
thru catlgs on Sndy ethr).
Altrntivly, u wld be lkng 4 a dl lnr with a swtchd cap nvrtr (nt a
prticly gd chce for prcsn lctrncs, ncdntly), nd once mre I dnt knw of
ny.
Gvn tht usng swtchrs wll ncsarly incrs ur cmpnt cnt by a mn of 2
ndctrs, u wld be bttr ff usn 3 dvcs with th assctd npt nd otpt caps
(whch u wll nd wth an spply).
If ur npt is AC, u'll nd a rctfr in frnt of it as wll (as ll th othrs
hre cld tll u).
Cheers
PeteS
(Practicing language skills)
