參數(shù)資料
型號(hào)： PT4855
廠商： Texas Instruments, Inc.
英文描述： "3.3V/1.5V/1.2V 25A
中文描述： 3.3V/1.5V/1.2V 25A 輸出 48V 輸入的三路輸出 DC/DC 轉(zhuǎn)換器
文件頁(yè)數(shù)： 2/13頁(yè)
文件大小： 233K
代理商： PT4855
For technical support and more information, see inside back cover or visit www.ti.com
Pin Function
1
+Vin
2
–Vin
3
EN 1
4
EN 2
5
TEMP
6
Pin Not Present
7
Do Not Connect
8
Vo
1
Adjust
9
+Vo
1
PT4850 Series
25-A Triple Output Isolated DC/DC
Converter For Logic Applications
Pin Function
10
+Vo
1
11
+Vo
1
12
COM
13
COM
14
COM
15
+Vo
2
16
+Vo
2
17
Vo
2
Adjust
18
COM
On/Off Enable Logic
Pin Configuration
Pin Descriptions
Pin 3
Pin 4
Output Status
1
×
Off
0
1
On
×
0
Off
Notes:
Logic 1 =Open circuit
Logic 0 = –Vin (pin 2) potential
For positive Enable function, connect pin 3
to pin 2 and use pin 4.
For negative Enable function, leave pin 4
open and use pin 3.
+Vin:
The positive input supply for the module with
respect to –Vin. When powering the module from a
–48V telecom central office supply, this input is
connected to the primary system ground.
–Vin:
The negative input supply for the module, and
the 0VDC reference for the EN 1, and EN 2 inputs.
When powering the module from a +48V supply,
this input is connected to the 48V(Return).
EN 1:
The negative logic input that activates the
module output. This pin must be connected to –Vin
to enable the module’s outputs. A high impedance
disables the module’s outputs.
EN 2:
The positive logic input that activates the
module output. If not used, this pin should be left
open circuit. Connecting this input to –Vin disables
the module’s outputs.
TEMP:
This pin produces an output signal that tracks
a temperature that is approximately the module’s
metal case. The output voltage is referenced to –Vin
and rises approximately 10mV/°C from an intital
value of 0.1VDC at –40°C. The signal is available
whenever the module is supplied with a valid input
voltage, and is independant of the enable logic status.
(
Note:
A load impedance of less than 1M
will adversly
affect the module’s over-temperature shutdown threshold.
Use a high-impedance input when monitoring this signal.)
Vo 1:
The highest regulated output voltage, which is
referenced to the COM node.
Vo 2:
The regulated output that is designed to power
logic circuitry. It is referenced to the COM node.
Vo 3:
The low-voltage regulated output that provides
power for a μ-processor or DSP core, and is refer-
enced to the COM node.
COM:
The secondary return reference for the module’s
three regulated output voltages. It is DC isolated from
the input supply pins.
Vo
(n)
Adjust:
Using a single resistor, this pin allows the
associated output Vo
(n)
to be adjusted higher or lower
than the preset value. If not used, this pin should be
left open circuit.
Vo
(n)
Rem Sense:
An external remote sense input is
provided for the two lowest voltage outputs, +Vo
2
and +Vo
3
. Connecting the remote sense pins im-
proves the load regulation of the applicable output
by allowing the regulation circuit to compensate for
voltage drop between the converter and load. If
desired these inputs may be left disconnected.
Note: Shaded functions indicate those pins that are at primary-side potential.
Pin Function
19
COM
20
COM
21
Vo
3
Adjust
22
+Vo
3
23
+Vo
3
24
Vo
3
Rem Sense
25
Vo
2
Rem Sense
26
Do Not Connect
SLTS166C - FEBRUARY 2002 - REVISED MARCH 2003
Environmental Specifications
Characteristics
Symbols
Conditions
Min
Typ
Max
Units
Operating Temperature Range
Case Temperature
Storage Temperature
Over Temperature Protection
Mechanical Shock
T
a
T
c
T
s
OTP
Over V
in
Range
–40
—
–40
—
—
—
—
110
+85
(i)
105
+125
125
°C
°C
°C
°C
—
Case temperature
Per Mil-STD-883D, Method 2002.3
1 msec, Sine, mounted
Mil-STD-883D, Method 2007.2
20-2000 Hz
Vertical/Horizontal
Meets UL 94V-O
—
500
—
G’s
Mechanical Vibration
Suffix N
Suffix A, C
—
—
—
10
(ii)
20
(ii)
90
—
—
—
G’s
Weight
Flammability
—
—
grams
Notes:
(i) See SOA curves or consult factory for appropriate derating.
(ii) The case pins on through-hole pin configurations (N & A) must be soldered. For more information see the applicable package outline drawing.
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PT4855C 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Triple-Output Iso DC-DC Cnvtr RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)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(fēng)格:SMD/SMT
PT4855N 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Triple-Output Iso DC-DC Cnvtr RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)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(fēng)格:SMD/SMT
PT4856 制造商:TI 制造商全稱:Texas Instruments 功能描述:25-A Triple Output Isolated DC/DC Converter For Logic Applications
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