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PT4856 Datasheet

  • PT4856

  • 25-A Triple Output Isolated DC/DC Converter For Logic Applic...

  • 233.37KB

  • 13頁

  • TI

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PT4850 Series
25-A Triple Output Isolated DC/DC
Converter For Logic Applications
SLTS166C - FEBRUARY 2002 - REVISED MARCH 2003
Features
鈥?/div>
Triple Logic Voltage Outputs
(Independently Regulated !)
鈥?/div>
Input Voltage Range:
36V to 75V
鈥?/div>
1500VDC Isolation
鈥?/div>
Over-Current Protection
鈥?/div>
Over-Voltage Protection
鈥?/div>
Over-Temperature Shutdown
鈥?/div>
Under-Voltage Lockout
鈥?/div>
Independently Adjustable Outputs
鈥?/div>
Dual Logic On/Off Control
鈥?/div>
Fixed Frequency Operation
鈥?/div>
Solderable Space Saving Package:
1.97 sq. in. PCB Area (suffix N)
鈥?/div>
IPC Lead Free 2
鈥?/div>
Safety Approvals Pending:
UL60950
CSA 22.2 950
VDE EN60950
Description
The PT4850 Excalibur鈩?power
modules are a series of isolated triple-
output DC/DC converters that
operate from a standard (鈥?8V)
central office supply. These modules
are rated for a combined output of
up to 25A, and were designed for
powering mixed logic applications.
The triple-output voltage provides
a compact multiple-output power
supply in a single DC/DC module.
Output voltage options include
a low-voltage output for a DSP or
ASIC core, and two additional supply
voltages for the I/O, and other func-
tions.
The PT4850 series incorporates
many features to simplify system
integration. These include a flexible
On/Off enable control, input under-
voltage lockout and over-temperature
protection. All outputs are current
limited and short-circuit protected,
and are internally sequenced to meet
the power-up and power-down re-
quirements of popular DSP ICs.
The PT4850 series is housed in
a space-saving solderable case. The
module requires no external heat
sink. Both vertical and horizontal
pin configurations are available, in-
cluding surface mount.
Ordering Information
PT4851o
PT4852o
PT4853o
PT4854o
PT4855o
PT4856o
=
=
=
=
=
=
+3.3/+2.5/+1.5V
+3.3/+1.8/+1.5V
+3.3/+2.5/+1.2V
+3.3/+1.8/+1.2V
+3.3/+1.5/+1.2V
+5.0/+3.3/+1.5V
PT Series Suffix
(PT1234
x
)
Case/Pin
Configuration
Vertical
Horizontal
SMD
Order
Suffix
Package
Code
(EKD)
(EKA)
(EKC)
N
A
C
(Reference the applicable package code drawing for
the dimensions and PC layout)
Standard Application
PT4850
+V
IN
+Vo
1
9,10,11
1
+V
IN
V
1
Adj 8
COM 12,13,14
V
2
Sense
+
C
IN
Q1
4
3
EN 2
EN 1
V
3
Sense
+Vo
2
25
15,16
+
Co
2
24
Core
+
Co
3
Logic
DSL, DSP,
or ASIC
Chipset
+
Co
1
I/O
17
V
2
Adj
鈥揤
IN
2
+Vo
3
22,23
鈥揤
IN
V
3
Adj 21
1 =Inhibit
COM 18,19,20
C
in
=Optional
Co
1
, Co
2
, Co
3
=Optional. See specifications
EN1 & EN2 operation: See application notes
For technical support and more information, see inside back cover or visit www.ti.com

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