zxre060a Diodes, Inc., zxre060a Datasheet - Page 9

• Manufacturer Part Number: zxre060a
• Description: 0.6v Adjustable Precision Shunt Regulator
• Manufacturer: Diodes, Inc.

ZXRE060
Document Rev. 1
Figure 8 – 1.15V over-voltage indicator
Design guides
1. Determine I
2. Determine I
3. Determine I
4. Determine R3 from
5. It is best to let the ZXRE060 supply as much current as it can before bringing Q1 into
6. Calculate R4 from
Figure 7 - 1V Current-boosted shunt regulator
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
OUT
B
R3
from
from
and choose a suitable transistor taking power dissipation into consideration.
I
R =
B
I
R
R
4
=
3
3
(
=
=
h
V
I
I
I
FE
OUT
OUT
V
R
BE
4
(min)
IN
(max)
(max)
−
I
R
+
V
3
OUT
) 1
www.diodes.com
9 of 10
V
V
LED1 respectively.
R
15
V
OUT
F
M
3
mA
and I
>
=
goes low and LED is lit when monitored supply
V
≥
V
REF
F
I
IN
R
are forward voltage drop and current of
3
−
⎛
⎜
⎝
≤
1
V
(
R
(
I
V
OUT
+
V
( F
I
3
OUT
R
MAX
F
R
=
R
3
=
2
V
1
+
≥
V
IN
Diodes Incorporated
⎞
⎟
⎠
)
0
. 0
REF
2 .
−
I
R
V
V
) 2
A Product Line of
3
⎛
⎜
⎝
1
OUT
+
+
V
R
R
BE
2
1
)
⎞
⎟
⎠
R4
© Diodes Incorporated
.
March 2009
ZXRE060