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參數(shù)資料
| 型號： | PT3341N |
| 英文描述： | DC to DC Converter |
| 中文描述： | DC至DC轉換器 |
| 文件頁數(shù)： | 7/9頁 |
| 文件大?。?/td> | 194K |
| 代理商： | PT3341N |
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
Using Remote On/Off on Power Trends
’
30W Isolated DC-DC Converter Series
Power Trends’ 30W isolated series of DC/DC converters
incorporate a
Remote On/Off
function. This function may
be used in applications for battery conservation, power-
up/shutdown sequencing, or to co-ordinate the power-up
of the regulator for active in-rush current control. (See
TI application reports, SLTA021, and SLUA250).
The Remote On/Off function is provided by pin 2. If
pin 2 is left open-circuit, the converter provides a regu-
lated output whenever a valid source voltage
1
is applied
between +V
in
(pins 7-9), and –V
in
(pins 4-6). Applying
a low voltage
2
, with respect to –V
in
(pin 2), disables the
regulator output
3
. Table 1 details the control requirements
for this input. Figure 1 shows how a discrete MOSFET
(Q
1
) may be referenced to the negative input voltage rail
to control the Remote On/Off pin.
Table 1 Remote On/Off Control Requirements
2
Parameter
min
Enable (V
IH
)
2.5V
5
Disable (V
IL
)
–0.3V
max
15V
0.8V
(or open circuit)
4
Notes:
1. These converters incorporate an “Under Voltage Lockout”
(UVLO) function. This function automatically holds the
converter output in the “Off” state until there is sufficient
input voltage for the converter to produce a regulated
output. Table 2 gives the applicable UVLO thresholds.
Table 2 UVLO Thresholds
Series
PT3320/4560
PT3340/4580
UVLO Threshold
34 ± 2.0V
16.5 ± 1.5V
V
in
Range
36 – 75V
18 – 60V
2. The Remote On/Off control pin uses –V
in
(pins 4-6) as its
ground reference. All voltages specified are with respect to
–V
in
.
3. When the converter output is disabled the current drawn
from the input supply is typically reduced to 8mA (16mA
maximum).
4. The internal circuitry comprises of a high impedance (3μA
-10μA) current source. The open-circuit voltage is less
than 10V.
5. The Remote On/Off pin is ideally controlled using devices
with an open-collector (or open-drain) output. A small
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).
Figure 1
Turn-On Time:
When the Remote On/Off input is left
open-circuit, the output of the converter is automatically
enabled when a valid input voltage
1
is applied to the
input power pins. The converter typically rises to full
regulation within 30ms of the application of power (or
after the release of the Remote On/Off pin with input
power applied). The actual turn-on time will vary with
the input voltage, output load, and the total amount of
capacitance connected to the output. Using the circuit of
Figure 1, Figure 2 shows the typical output voltage and
input current waveforms for a PT3322/PT4562 after Q
1
is turned off. The turn off of Q
1
correlates with the fall
of the Q
1
Vgs waveform. The waveforms were measured
with a 48Vdc input voltage, and 5-A resistive load.
Figure 2
PT3320/3340/4560/4580 Series
30W Isolated
18
4, 5, 6
7, 8, 9
+Vin
+Vout
-Vin
Vo(adj)
Remote
On/Off
2
Sns(+)
19
10 - 12
-Vout
14 - 17
Sns(-)
13
C
out
+
C
in
+
Q1
BSS138
+V
o
–
V
o
+V
in
-V
in
OFF/ ON
C
0.01μF
R
1
, 10k
R
1
& C
1
-See Note 7
6. Keep the on/off transition to less than 1ms. This prevents
erratic operation of the ISR, whereby the output voltage
may drift un-regulated between 0V and the rated output
voltage during power-up.
7. In Figure 1, Q
1
is a low-threshold MOSFET. The
components R
1
and C
1
are added to improve noise
susceptibility.
Vo (2V/Div)
Iin (0.5A/Div)
Q1Vgs (10V/Div)
HORIZ SCALE: 2ms/Div
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PDF描述 |
|---|---|
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| PT3342C | DC to DC Converter |
| PT3342N | 55V Single N-Channel HEXFET Power MOSFET in a TO-220 FullPak (Iso) package; A IRFIZ24NPBF with Standard Packaging |
| PT3343A | 20V Single N-Channel HEXFET Power MOSFET in a D2-Pak package; A IRL3402S with Standard Packaging |
| PT3343C | DC to DC Converter |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| PT3342 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:30 WATT ISOLATED DC/DC CONVERTER |
| PT3342A | 功能描述:直流/直流開關轉換器 5Vout 30W 18-60V Input Iso DC/DC RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| PT3342C | 功能描述:直流/直流開關轉換器 5Vout 30W 18-60V Input Iso DC/DC RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| PT3342N | 功能描述:DC/DC轉換器 5Vout 30W 18-60V Input Iso DC/DC RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
| PT3343 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:30 WATT ISOLATED DC/DC CONVERTER |
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