ZXRE160FT4-7 Diodes Inc. / Zetex, ZXRE160FT4-7 Datasheet - Page 10

• Manufacturer Part Number: ZXRE160FT4-7
• Description: Voltage & Current References 1.0V ENH ADJ Prec Shunt REG 5-Term
• Manufacturer: Diodes Inc. / Zetex

Specifications of ZXRE160FT4-7

• Rohs: yes
• Product: Voltage References
• Topology: Shunt References
• Output Voltage: 0.2 V to 18 V
• Maximum Operating Temperature: + 125 C
• Package / Case: X2-DFN1520-6
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Reference Type: Adjustable
• Series Vref - Input Voltage (max): 18 V
• Series Vref - Input Voltage (min): 2 V

Application Information
Design guide
1.
2.
3.
4.
5.
Calculate R4 from
ZXRE160
Document number: DS35688 Rev. 2 - 2
Determine I
Determine I
Determine I
Determine R3 from
It is best to let the ZXRE160 supply as much current as it can before bringing Q1 into conduction. Not only does this minimize 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
R =
from
4
and choose a suitable transistor taking power dissipation into consideration.
I
B
V
I
I
R
R
R
BE
=
3
3
4
h (
=
=
I
OUT
FE
I
OUT
V
(min)
IN
(max)
(max)
−
I
R
+
V
3
) 1
OUT
(cont.)
Figure 8. 1V Current-Boosted Shunt Regulator
Figure 9. 1.15V Over-Voltage Indicator
www.diodes.com
10 of 15
V
V
OUT
F
and I
goes low and LED is lit when monitored supply
F
are forward voltage drop and current of LED1.
V
Diodes Incorporated
15
V
OUT
R
R
V
OUT
3
mA
M
3
A Product Line of
=
=
>
=
V
≥
≥
V
V
V
IN
R I
REF
0
IN
REF
2 .
−
3
−
I
R
(
R I
V
≤
V
⎛
⎜
⎝
⎛
⎜
⎝
V
3
1
1
F
3
I
+
OUT
( F
+
+
+
V
MAX
R
R
R
. 0
R
BE
2
1
2
1
) 2
⎞
⎟
⎠
⎞
⎟
⎠
)
R4
.
ZXRE160
© Diodes Incorporated
June 2012