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參數(shù)資料
| 型號(hào)： | PT480F |
| 廠商： | Sharp Corporation |
| 英文描述： | Narrow Acceptance Phototransistor |
| 中文描述： | 窄驗(yàn)收光電晶體管 |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 159K |
| 代理商： | PT480F |
For technical support and more information, see inside back cover or visit www.ti.com
Using the Remote On/Off Control on the PT4801
Triple-Output Voltage DC/DC Converter
The three output voltages of the PT4801 triple-output
DC/DC converter may be simultaneously disabled using
the
Remote On/Off
control. This control is used in appli-
cations that require power-up/shutdown sequencing, or
wherever there is a requirement to control the on/off sta-
tus of the module with external circuitry.
On/off control of the PT4801 is provided by pin 1. If
pin 1 is left open-circuit the regulator operates normally,
and provides a regulated output at all three outputs, Vo
1
(pin 10), Vo
2
(pins 14, 15), and Vo
3
(pin 18), whenever a
valid input voltage is applied to ±V
in
. If a low voltage is
then applied to pin 1, the module’s output will be disabled
and the input current it draws will drop to a typical value
of 8mA. The
Remote On/Off
input may also be used to hold
the module’s output in the ‘off’ state during the period
that input power is applied. The input
is ideally controlled
using an open-collector (or open-drain) discrete transistor
(See Figure 1)
3
.
Table 1 Remote On/Off Control Parameters
1, 2
Parameter
Enable (V
IH
)
Disable (V
IL
)
Min
2.5V
–0.1V
Typ
—
—
Max
15V
3
0.8V
Notes:
1. The
Remote On/Off
input uses –V
in
(pins 3 & 4) as a
ground reference, and cannot be directly controlled
from circuitry referenced to the isolated output ±V
o
.
2. The internal circuitry comprises of a high impedance (3μA
-10μA) current source. The open-circuit voltage is less
than 10V.
3. A low-leakage MOSFET (<100nA) is recommended. A
pull-up resistor is not required, but may be necessary to
ensure that the
Remote On/Off
pin exceeds V
IH
(min)
(see Table 1).
Do not
use a pull-up resistor to the +V
in
input, or drive the pin above V
IH
(max).
4. The PT4801 converter incorporates an “Under Voltage
Lockout” (UVLO) function. This function will overide
the
Remote On/Off
control until the input voltage
applied to ±V
in
, is above the UVLO threshold. Consult
the data sheet specifications for the on/off input voltage
voltage thresholds.
5. Keep the on/off transition to less than 1ms. This prevents
erratic operation of the converter, whereby the output
voltage may drift un-regulated between 0V and the rated
output voltage during power-up.
Figure 1
Power-Up Sequence:
Turning Q
1
in Figure 1 off, removes
the low-voltage signal at pin 1 and enables the outputs of
the PT4801 converter. After a delay of about 5ms, the
Vo
1
output will begin to rise first. This is closely followed
by Vo
2
, and Vo
3
, which are internally sequenced to rise in
unison. The total power-up time is less than 25ms and is
relatively independent of load, and temperature. Figure 2
shows waveforms of all three output voltages, Vo
1
, Vo
2
,
and Vo
3
following Q
1
turning off. The turn off of Q
1
corresponds to the fall in the applied V
gs
. The wave-
forms were measured with a 48V input voltage.
Figure 2
PT4801
+V
IN
–
V
IN
High =Off
+Vo
1
+Vo
2
+Vo
3
Co
1
Co
3
Co
2
C
IN
PT4801
6, 7
3, 4
10
14, 15
18
16, 17
1
Vo
1
COM
COM
Vo
2
Vo
3
+V
IN
–
V
IN
Remote
On/Off
Vo
2
adj
Vo
3
adj
12
19
11
Q
BSS138
COM
R
g
C
gs
R
g
& C
gs
, See Note 6
Vo1 (5V/Div)
Vo2 (2V/Div)
Vo3 (2V/Div)
HORIZ SCALE: 5ms/Div
Q1 Vgs (5V/Div)
6. In Figure 1, Q
1
is a low-threshold MOSFET. The
components R
g
and C
gs
are added to improve noise
immunity.
Application Notes
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PT4841 | 15V/3.3V/1.5V 48V-Input 65 Watt Triple-Output DC/DC Converter |
| 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 |
| PT4842 | 12V/3.3V/1.8V 48V-Input 62-Watt Triple-Output DC/DC Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PT480FE0000F | 功能描述:光電晶體管 PT480 w/ Visible lite cut-off 860nm RoHS:否 制造商:OSRAM Opto Semiconductors 最大功率耗散:165 mW 最大暗電流:200 nA 封裝 / 箱體:T-1 |
| PT480FE000F5 | 制造商:Sharp Microelectronics Corporation 功能描述:Opto,Photo tr.,860nm,+/-13deg.side view |
| PT481 | 功能描述:PHOTO TRANS BLUE LEN 800NM 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: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 |
| PT4810 | 功能描述:PHOTO TRANS BLUE LEN 800NM 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: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 |
| PT4810E0000F | 功能描述:光電晶體管 Darlington output Ver of PT4800 7mA RoHS:否 制造商:OSRAM Opto Semiconductors 最大功率耗散:165 mW 最大暗電流:200 nA 封裝 / 箱體:T-1 |
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