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參數(shù)資料
| 型號(hào)： | TCN4040D-2.5EZB |
| 廠(chǎng)商： | TelCom Semiconductor, Inc. |
| 英文描述： | PRECISION MICROPOWER SHUNT VOLTAGE REFERENCE |
| 中文描述： | 精密微功耗并聯(lián)電壓基準(zhǔn) |
| 文件頁(yè)數(shù)： | 8/9頁(yè) |
| 文件大?。?/td> | 127K |
| 代理商： | TCN4040D-2.5EZB |
TCN4041
4
PRELIMINARY INFORMATION
TCN4041-01 6/19/97
PRECISION MICROPOWER
SHUNT VOLTAGE REFERENCE
Output voltage on the TCN4041-ADJ can be adjusted to
any value between 1.24V and 10V. It is a function of the
internal reference voltage (V
REF
) and the ratio of the external
feedback resistors (see Figure 2). The output can be found
with the equation (where V
OUT
is the desired output voltage):
V
OUT
= V
REF
(R2/R1 + 1)
Equation 1.
The value of the internal V
REF
is a function of V
O
. The
“corrected” V
REF
can be determined by (where V
O
is the
desired output voltage):
V
REF’
= V
OUT
V
REF
/
V
OUT
) +V
Y
Equation 2.
V
REF
/
V
OUT
is typically -1.3mV/V, and V
Y
= 1.240V.
Replace the value of V
REF’
in Equation 1 with the value
determined using Equation 2.
The actual output voltage can deviate from that pre-
dicted by the typical
V
REF
/
V
O
in Equation 2. The worst
case
V
REF
/
V
OUT
for C-grade parts is – 2.5mV/V and
V
Y
= 1.246V; for D-grade, the worst case is – 3.0mV/V and
V
Y
= 1.248V.
The difference in output voltage resulting from typical
worst case values are shown in the following example: Let
V
O
= +9V. Using the typical value of
V
REF
/
V
OUT
, V
REF
is
1.228; choosing a value of R1 = 10k
, R2 = 63.272kW. The
output voltage, when using worst case
V
REF
/
V
OUT
for
C-grade and D-grade parts, is 8.965V and 8.946V, respec-
tively. This could result in errors as large as 0.39% for
C-grade, and 0.59% for D-grade parts. However, resistor
values resulting from the typical value of
V
REF
/
V
OUT
will
work most of the time, requiring no additional adjustments.
APPLICATIONS INFORMATION
Available in space-saving SOT-23B-3 surface
mount packages, the TCN4041 is a precision micro-power
curvature-corrected bandgap shunt voltage reference. It is
designed for stable operation without an external capacitor
connected between the “+” pin and the “-” pin. The TCN4041
also remains stable, however, if a bypass capacitor is used.
The device is available in either a fixed 1.2V or an adjustable
reverse breakdown voltage. The minimum operating cur-
rent is 60mA, and the maximum operating current is 12mA
for both options.
TCN4041s in the SOT-23 package have pin 1
connected as the (-) output. (Die attach interface contact).
Therefore, pin 1 of the TCN4041-1.2 must be left floating or
connected to pin 3, and pin 1 on the TCN4041-ADJ is the
(-) output.
In a conventional shunt regulator application, an
external series resistor (R
S
) is connected between the
supply voltage and the TCN4041 (Figure 1). R
S
determines
the current that flows through the load (I
L
) and the TCN4041
(I
Q
). Even when the supply voltage is at its minimum, and
the load current is at its maximum value, R
S
should be small
enough to supply at least the minimum acceptable I
Q
to the
TCN4041 since load current and supply voltage may vary.
Conversely, when the supply voltage is at its maximum and
I
L
is at its minimum, R
S
should be large enough that the
current flowing through the TCN4041 is less than 12mA.
R
S
is determined by the supply voltage, (V
S
), the
load and operating current, (I
L
and I
Q
), and the TCN4041’s
reverse breakdown voltage, V
R
.
V
S
- V
R
R
S
=
I
L
+ I
Q
PIN DESCRIPTION
Pin No.
(SOT-23B-3)
Pin No.
TO-92
Pin No.
8-Pin SOIC
Symbol
Description
1
1
1
2
3
NC
NC
NC
+
–
–
NC
NC
NC
+
No connection
No connection
No connection
Positive terminal
Negative terminal
Negative terminal
No connection
No connection
No connection
Positive terminal
2
3
2
3
4
5
6
7
8
相關(guān)PDF資料 |
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| TCN4040E-2.5EZB | PRECISION MICROPOWER SHUNT VOLTAGE REFERENCE |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TCN4040E-2.5ENB | 制造商:TELCOM 制造商全稱(chēng):TelCom Semiconductor, Inc 功能描述:PRECISION MICROPOWER SHUNT VOLTAGE REFERENCE |
| TCN4040E-2.5EZB | 制造商:TELCOM 制造商全稱(chēng):TelCom Semiconductor, Inc 功能描述:PRECISION MICROPOWER SHUNT VOLTAGE REFERENCE |
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