Table of Contents
Advertisement
llo4ITEA
---- - - ,
I
SEAlES
REGULAT~
~
'
I
OKJO(
SWrTCH
I
I
FOLDBACI(
L__
~~tfE
SHUNT
CUAAENT
DAIVE CURRENT
L ._ _
__ _ _
_....._ _
el654A
Model 654A
:ross the
witched
, further
.es.
~V~
_______
R~E~~~~~TE~D~~~T.~G~E
________
~
I across
, is fed
cia
to
consists
:enuator
of the
resistive
tions to
controls
IUTPUT
B steps,
IOOmA
200mA
300m A
~
f-
3
10V
OUTPUT CURRENT
leously;
both of
Figure 4-2. Regulated Power Supply Output
Voltage vs Current.
) selects
A. The
ions are
~
shown
he BAL
j
J4, are
voltaged
e power
ogulated
limiting
JIlctially
. voltage
supply
voltage.
supplies
00 rnA.
curren t
Iy 16 V
short to
Hent of
current
ies. The
- ) is a
I
t is first
It
Limit
current
ply will
on until
J
return
output
16.2V).
OONvENnCIIIAL
CURRENT
LIMIT
i552A-B-4314
Sectiull II
If the latter occurs, the Diode Switch is effectively closed
and the power supply goes into a Foldback Current Limit
condition. In this condition the Current Limiting Transistor
is controlled by tile power supply outpu t Voltage. As tile
output voltage decreases, the shunt current is increased.
UNA£OULATEO
DC
~~~f~
==;;-'
OONVENTlONAl CUARENT LIMITER
1-
-iii~T~~i~\~-----
1
'
I '
\
:
f"
R(
:j,L!L AT"[C
f--i
- --.-wY-..----+---""""
~WJl~J
T
i
32<
I
,
L
__
______
_
_
_____
...J
r-----
I
Figure 4-3. Simplified Schematic of Current
Limiting Circuitry
4-5
Advertisement
Table of Contents
