ZXRE060AFT4-7 DIODES [Diodes Incorporated], ZXRE060AFT4-7 Datasheet - Page 8

• Manufacturer Part Number: ZXRE060AFT4-7
• Description: 0.6V ADJUSTABLE PRECISION SHUNT REGULATOR
• Manufacturer: DIODES [Diodes Incorporated]

Application Information
ZXRE060
Document number: DS33611 Rev. 6 - 2
Design guides
Figure 8. 1.15V over-voltage indicator
1.
2.
3.
4.
5.
6.
Figure 7. 1V Current-boosted shunt regulator
Determine I
Determine I
Determine I
Determine R3 from
It is best to let the ZXRE060 supply as much current as it can before bringing Q1 into conduction. Not
only does this minimise the strain on Q1, it also guarantees the most stable operation. Choose a nominal
value between 10mA and <15mA for this current, I
Calculate R4 from
OUT
B
R3
from
from
and choose a suitable transistor taking power dissipation into consideration.
(Continued)
B I
R =
R I =
R
4
=
3
3
h (
=
I
V
OUT
R I
FE
I
V
BE
OUT
4
IN
(min)
(max)
−
R I
(max)
V
3
+
OUT
) 1
0.6V ADJUSTABLE PRECISION SHUNT REGULATOR
www.diodes.com
V
V
15
R
V
OUT
F
M
3
mA
and I
=
8 of 12
>
goes low and LED is lit when monitored supply
V
V
≥
IN
REF
F
R I
are forward voltage drop and current of LED1.
−
R4
3
(
R I
⎛
⎜
⎝
.
V
1
≤
F
3
+
I
( F
+
R
R
. 0
MAX
1
2
(
) 2
V
R
⎞
⎟
⎠
V
OUT
3
OUT
=
)
V
IN
=
≥
V
0
Diodes Incorporated
−
R I
REF
2 .
V
3
V
OUT
A Product Line of
⎛
⎜
⎝
+
1
V
+
BE
R
R
1
2
)
⎞
⎟
⎠
© Diodes Incorporated
ZXRE060
March 2011