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參數(shù)資料
| 型號(hào)： | SI-8033JD |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | Step-Down to 3.3 V, 1.5 A, DC/DC Converter |
| 中文描述： | 降壓到3.3 V，1.5 A的，直流/直流轉(zhuǎn)換器 |
| 文件頁數(shù)： | 6/6頁 |
| 文件大小： | 63K |
| 代理商： | SI-8033JD |
85
1. Soft Start
Connecting a capacitor to terminal no. 5 permits a soft start at power-
on. Delay time T
d
and rise time T
s
can roughly be calculated as
shown below. (However, the values may slightly vary in an actual
application.) If the capacitance of C
3
is increased, it takes longer to
discharge C
3
after V
IN
is turned off. Therefore, it is recommended to
set the value within 10
μ
F. When not using the soft start function,
keep terminal no. 5 open.
T
d
= 0.7
×
C
3
(sec)
20
×
10
–6
T
= 4.845
×
C
3
(sec)
V
IN
×
20
×
10
–6
SI-8000S
5
S. S.
C
3
V
IN
V
O
T
d
T
S
2. Output ON/OFF control
Output can be turned on and off by using the soft start terminals.
Set the soft start terminal voltage to V
SSL
(0.2V typ.) or less to stop
output. To switch the potential at the soft start terminals, drive the
open collector of the transistor. Since the discharge current from C
3
flows to the ON/OFF control transistor, limit the current for protec-
tion. The SS terminal is pulled up to the power supply in the IC and
no external voltage can be applied.
SI-8000S
5
S. S + ON/OFF
S. S.
C
3
SI-8000S
5
S. S.
ON/OFF
Applications
G
SI-8000S Series
(3) Sensing terminal
Output voltage sensing terminal V
OS
should be connected as close
to output capacitor C
2
as possible. If the terminal is far from the
capacitor, the decreasing regulation and increasing switching
ripple may result in abnormal oscillation.
+
L
1
5
V
OUT
V
IN
GND
C
1
C
2
D
1
SI-8000S
Example of basic pattern
Top view (with part names)
3. Variable Output Voltage
The output voltage can be increased by connecting a resistor to V
OS
terminal No. 4. (There is no way of decreasing the voltage)
(1) Variable output voltage with single external resistor
SI-8000S
2
4
V
O
'
GND
C
2
R
EX
V
S
IV
S
L
3
The output voltage adjustment resistance R
EX
is calculated
as follows:
R
= V
O
'–V
S
IV
S
V
S
: Set output voltage of product
V
O
' : Adjusted output voltage
I
VS
: Inflow current to Vs terminal
* The temperature characteristics of output voltage worsen because
the value R
EX
is not compensated for temperature. The Vs value
fluctuates by up to
±
20% depending on the IC product. Since the
output voltage fluctuates more, a semi-fixed resistor is necessary
for accurate output voltage adjustment. If Vs and R
EX
are constant,
the range of output voltage fluctuation can be expressed as follows:
V
O
'(%)=
±
20 V
O
'–V
S
V
O
'
V
O
':Adjusted output voltage
(2) Variable output voltage with two external resistors
SI-8000S
2
4
V
O
GND
C
2
R
EX1
R
EX2
IR
EX1
IV
S
V
S
L
3
The output voltage adjustment resistances R
EX1
and R
EX2
are
calculated as follows:
R
EX
1= V
O
'–V
S
SIV
S
V
S
(S-1)IV
S
S:Stability factor
R
2=
Bypassing the current to R
EX2
improves the temperature charac-
teristics and voltage fluctuation ranges more than the method of
(1). Stability factor S indicates the ratio of R
EX1
to Vs terminal
inflow current. Increasing the S value improves the fluctuations
of the temperature characteristics and output voltage. (Usually 5
to 10)
If the Vs and R
EX
values are constant, the output voltage fluctua-
tion range can be calculated as follows:
V
O
'(%)=
±
20 V
O
'–V
S
S V
O
'
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SI-8033JD-TL | 制造商:Sanken Electric Co Ltd 功能描述:IC REG BUCK 3.3V 1.5A TO263-5 |
| SI-8033JF | 制造商:Sanken Electric Co Ltd 功能描述:IC REG BUCK 3.3V 1.5A TO220F-5 |
| SI-8033JF-LF1101 | 制造商:Sanken Electric Co Ltd 功能描述: |
| SI-8033S | 制造商:Panasonic Industrial Company 功能描述:IC 制造商:Allegro MicroSystems 功能描述:IC, LINEAR VOLT REGULATOR, 3.3V, TO-220; Primary Input Voltage:28V; Output Voltage Min:3.17V; Output Voltage Max:3.43V; Output Voltage Fixed:3.3V; No. of Pins:5; No. of Outputs:1; Output Current:3A; Operating Temperature Min:-30C ;RoHS Compliant: Yes |
| SI-8033S LF1101 | 制造商:Sanken Electric Co Ltd 功能描述:Tube |
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