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參數(shù)資料
| 型號(hào)： | PT480 |
| 廠商： | Sharp Corporation |
| 英文描述： | Narrow Acceptance Phototransistor |
| 中文描述： | 窄驗(yàn)收光電晶體管 |
| 文件頁(yè)數(shù)： | 5/8頁(yè) |
| 文件大?。?/td> | 159K |
| 代理商： | PT480 |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT4801
Adjusting the Output Voltage of the PT4801
Triple-Output DC/DC Converter
The low-voltage outputs from the PT4801 triple-output
DC/DC converter, Vo
2
(3.3V) and Vo
3
(1.5V), can be
independently adjusted from the factory trimmed preset
value. Note that the primary use of this feature is for
margin testing of the on-board supply voltages. A per-
manent increase in output voltage is not advised
1
. Also,
due to design limitations, Vo
3
cannot be adjusted higher
than its nominal value.
To adjust each output, a single external resistor is added
to the circuit in either the “Adjust Up” or “Adjust Down”
position (See Figure 1)
2
. Table 1 gives the allowable
adjustment range for each output as V
a
(min) and V
a
(max).
Vo
2
Adjust Up:
Add a resistor R
2
between pin 12
(Vo
2
Adj), and pin 11 (COM)
1
.
Vo
2
Adjust Down:
Add a resistor
(R
1
)
between
pin 12 (Vo
2
Adj), and pin 14 (Vo
2
).
Vo
3
Adjust Up:
Vo
3
cannot be adjusted higher.
Vo
3
Adjust Down:
Add a resistor
(R
3
)
between pin 19
(Vo
3
Adj), and pin 18 (Vo
3
).
Refer to Figure 1 and Table 2 for both the placement and
value of the adjust resistor.
Notes:
1. The high-side adjust range of the Vo
2
output may be
limited by the input voltage and/or the load current
status of all three outputs. This situation would most
likely be encountered when Vo
1
is lightly loaded and
either Vo
2
or Vo
3
is operating close to full load.
2. Use only a single 1% resistor in either the
(R
1
)
or R
2
location to adjust Vo
2
, and in the
(R
3
)
location to
adjust Vo
3
. Place the resistor as close to the ISR as
possible.
3. Never connect capacitors to either of the output
adjust control pins. Any capacitance added to these
control pins will affect the stability of the respective
regulated output.
The adjust up and adjust down resistor values can be
calculated using the following formulas. Be sure to select
the correct formula parameter from Table 1 for the output
being adjusted.
(R
1
)
or
(R
3
)
=
R
o
(V
a
– V
r
)
(V
o
– V
a
)
– R
s
k
R
2
=
R
o
· V
r
(V
a
– V
o
)
– R
s
k
Where
V
o
V
a
V
r
R
o
= Multiplier resistor (Table 1)
R
s
= Series resistance (Table 1)
= Original output voltage
= Adjusted output voltage
= Reference voltage (Table 1)
Figure 1
+V
IN
–
V
IN
Vo
1
(+15VDC)
Vo
2
Vo
3
PT4801
6, 7
3, 4
10
14, 15
18
16, 17
11
1
Vo
1
COM
COM
Vo
2
Vo
3
+V
IN
–
V
IN
Remote
On/Off
Vo
2
adj
Vo
3
adj
Co
1
Co
3
Co
2
C
IN
R
Adjust Up
(R
)
Adjust
Down
(R
)
Adjust
Down
12
19
COM
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PDF描述 |
|---|---|
| PT480F | Narrow Acceptance Phototransistor |
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| PT4841A | 100V Single N-Channel HEXFET Power MOSFET in a TO-220 FullPak (Iso) package; Similar to IRLI520N with Lead Free Packaging |
| PT4841C | 20V Single N-Channel HEXFET Power MOSFET in a SO-8 package; A IRF7456 with Standard Packaging |
| PT4841N | DC to DC Converter |
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| PT4800F | 功能描述:PHOTO TRANS BLACK LEN 860NM SIDE RoHS:否 類別:傳感器，轉(zhuǎn)換器 >> 光學(xué) - 光電檢測(cè)器 - 光電晶體管 系列:* 標(biāo)準(zhǔn)包裝:1,200 系列:- 電壓 - 集電極發(fā)射極擊穿（最大）:30V 電流 - 集電極 (Ic)（最大）:1mA 電流 - 暗 (Id)（最大）:100nA 波長(zhǎng):880nm 視角:24° 功率 - 最大:100mW 安裝類型:通孔 方向:頂視圖 封裝/外殼:徑向 |
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