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參數(shù)資料
| 型號： | 724 |
| 英文描述： | Low-Dropout, 300mA Linear Regulators in SOT23 |
| 中文描述： | 724 -已停產(chǎn)產(chǎn)品。不再推薦用于新設計。 |
| 文件頁數(shù)： | 4/5頁 |
| 文件大小： | 83K |
| 代理商： | 724 |
4
724
INSTALLATION AND
OPERATING INSTRUCTIONS
Typical application connections for the 724 are shown in
Figures 1 and 2. Primary power (V
) is applied at the “P+”
and “V–” terminals. The common or ground for V
may be
connected to either “P+” or “V–”, the only requirement is
that “P+” and “V+” must be positive with respect to “V–”.
Power for the internal oscillator and switch drivers is de-
rived from the primary power by a voltage dropping resistor,
R
. The value of R
as a function of V
is shown in the
“Typical Performance Curves” section. Alternately, voltage
for the “V+” terminal may be obtained from a separate
source. “V+” should be +5VDC to +7.5VDC positive with
respect to “V–”. If a separate source is used, the V+ input
must be applied before the “P+” input to avoid possible
damage to the unit. P+ and V+ must remain positive with
respect to “V–” at all times (including transients). If neces-
sary, diode clamps should be put across these inputs.
The “E” pin enables the converter when connected to “V+”
and disables it when connected to “V–”.
An external capacitor, “C” (0.47
μ
F ceramic), is used to
reduce input ripple. It should be connected as close to the
“P+” and “V–” pins as practical. Input leads to these termi-
nals should also be kept as short as possible. Since the 724
is not internally shielded, external shielding may be appro-
priate in applications where RFI at the 800kHz nominal
oscillator frequency is a problem.
Each output is filtered with an internal 0.047
μ
F capacitor.
Output ripple voltage can be reduced below the specified
value by adding external capacitors up to 10
μ
F between
each output and its common.
DISCUSSION
OUTPUT CURRENT RATINGS
At rated output voltage accuracy, the 724 is capable of
providing 128mA divided among its eight outputs
(1)
. A
minimum average output current of 3mA is recommended at
each output to maintain voltage accuracy.
Outputs channels
(2)
may be connected in series or parallel for
higher output voltage or current.
ISOLATION CONFIGURATIONS
The fact that the four outputs of the 724 are isolated from the
input and from each other allows both two-port and three-
port isolation connections.
Figure 1 shows two 3650 optically coupled isolation ampli-
fiers connected in three-port configuration. Two of the 724
channels provide power to the 3650’s inputs. The other
channels supply power to both 3650’s outputs. Each
amplifier’s input and output are isolated from each other and
the system’s power supply common. Isolation specification
applies to the amplifier input-to-output voltage isolation
specification.
FIGURE 1. Three-Port Isolation.
3
2
2
+V
O3
C
3
–V
O3
+V
O4
C
4
–V
O4
3
1
1
+V
O1
C
1
–V
O1
+V
O2
C
2
–V
O2
P+
V+
E
V–
V
IN
1
1 2
2
1.3k
0.47μF
+15VDC
COM
Power Supply
Common
Denote separate input
common 1 and input common 2.
Denote separate output
common 1 and output common 2.
724
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|---|---|
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