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Details, datasheet, quote on part number:PT4853A
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| Part: | PT4853A |
| Category: | Power Management => Plug-in Power Solutions->Isolated->Multiple Output |
| Description: | ti PT4853, 3.3V/2.5V/1.2V 25A, 48-V Input Triple-output DC/DC Converter |
| Company: | Texas Instruments, Inc. |
| Datasheet: | Download PT4853A datasheet File size : 239 kB |
| Request For quote: | Find where to buy PT4853A
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Datasheet text preview:
PT4850 Series
25-A Triple Output Isolated DC/DC Converter For Logic Applications
SLTS166C - FEBRUARY 2002 - REVISED MARCH 2003
Features
· Triple Logic Voltage Outputs (Independently Regulated !) · Input Voltage Range: 36V to 75V · 1500VDC Isolation · Over-Current Protection · Over-Voltage Protection · Over-Temperature Shutdown · Under-Voltage Lockout · Independently Adjustable Outputs · Dual Logic On/Off Control · Fixed Frequency Operation · Solderable Space Saving Package: 1.97 sq. in. PCB Area (suffix N) · IPC Lead Free 2 · Safety Approvals Pending: UL60950 CSA 22.2 950 VDE EN60950
Description
The PT4850 ExcaliburTM power modules are a series of isolated tripleoutput DC/DC converters that operate from a standard (48V) central office supply. These modules are rated for a combined output of up to 25A, and were designed for powering mixed logic applications. T h e 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 functions. The PT4850 series incorporates many features to simplify system integration. These include a flexible On/Off enable control, input undervoltage 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 requirements 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, including 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 +VIN
+Vo1 9,10,11 1 +VIN V1 Adj 8 COM 12,13,14 V2Sense + CIN Q1 4 3 EN 2 EN 1 V3Sense +Vo2 V2 Adj 25 15,16 17 + Co2 24 Core + Co3 Logic DSL, DSP, or ASIC Chipset + Co1 I/O
VIN
2
+Vo3 22,23 VIN V3 Adj 21
1 =Inhibit
COM 18,19,20
Cin =Optional Co1 , Co2 , Co3 =Optional. See specifications EN1 & EN2 operation: See application notes
For technical support and more information, see inside back cover or visit www.ti.com
PT4850 Series
25-A Triple Output Isolated DC/DC Converter For Logic Applications
SLTS166C - FEBRUARY 2002 - REVISED MARCH 2003
Environmental Specifications
Characteristics Operating T mperature Range e Case T mperature e Storage T mperature e Over T mperature Protection e Mechanical Shock Mechanical Vibration Weight Flammability -- -- Symbols Ta Tc Ts OTP Conditions Over Vin Range -- Case temperature Per Mil-STD-883D, Method 2002.3 1 msec, ½ Sine, mounted Mil-STD-883D, Method 2007.2 20-2000 Hz Vertical/Horizontal Meets UL 94V-O Min 40 -- 40 -- -- Suffix N Suffix A, C -- -- -- Typ -- -- -- 110 500 10 (ii) 20 (ii) 90 Max +85 (i) 105 +125 125 -- -- -- -- Units °C °C °C °C G's G's 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.
Pin Configuration
Pin Function
1 2 3 4 5 6 7 8 9 +Vin Vin EN 1 EN 2 TEMP Pin Not Present Do Not Connect Vo1 Adjust +Vo1
On/Off Enable Logic
Pin Function
10 11 12 13 14 15 16 17 18 +Vo1 +Vo1 COM COM COM +Vo2 +Vo2 Vo2 Adjust COM
Pin Function
19 20 21 22 23 24 25 26 COM COM Vo3 Adjust +Vo3 +Vo3 Vo3 Rem Sense Vo2 Rem Sense Do Not Connect
Pin 3 1 0 ×
Pin 4 × 1 0
Output Status Off On 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.
Note: Shaded functions indicate those pins that are at primary-side potential.
Pin Descriptions
+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 referenced 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, +Vo2 and +Vo3. Connecting the remote sense pins improves 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.
For technical support and more information, see inside back cover or visit www.ti.com
PT4850 Series
25-A Triple Output Isolated DC/DC Converter For Logic Applications
SLTS166C - FEBRUARY 2002 - REVISED MARCH 2003
Electrical Specifications
Characteristics Output Current
(Unless otherwise stated, the operating conditions are:- Ta =25°C, V in =48V, and I o =0.5Io max) Symbols Io Iotot Vin Votol Regtemp Regline Regload Regcross Vo tol Vr Conditions Each output Io1 Io2 Io3
PT4850 Series (Except PT4856) Min Typ Max
0 0 0 -- 36 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 280 -- 30 3.5 0.2 -- -- -- -- -- -- -- -- ±0.5 ±0.2 ±5 -- ±2 85 50 20 20 15 200 5 ±10 20 15 15 125 (2) 320 34 32 -- -- 0.5 2.5 2 -- -- 2,200 -- 0.1 (4) 1.5 (4) 15 10 10 25 75 80 1.5 -- ±0.5 ±10 ±10 ±3 -- 75 50 30 25 -- -- -- -- -- -- -- 340 36 -- Open (3) 0.8 (3) -- 4
(1) (1)
Units A A V %Vo %Vo %Vo mV mV %Vo % mVpp µSec %Vo %Vo A %Vo kHz V
Input Voltage Range Set-Point Voltage T lerance o Temperature Variation Line Regulation Load Regulation Cross Regulation Total Output Voltage Variation Efficiency Vo Ripple (pk-pk)
T tal (all three outputs) o Continuous Surge (1 minute) 40°C Ta +85°C, Io1 =Io2 =Io3 =Iomin All outputs, Over Vin range Each output, 0IoIomax Any output vs. another Includes set-point, line, load, 40°C Ta +85°C Io1 =10A, Io2 =5A, Io3 =5A 20MHz bandwidth, Vo =5.0V Vo =3.3V Io1 =Io2 =Io3 =5A Vo =1.8V/2.5V Vo 1.5V 0.1A/µs load step, 50% to 75% Iomax Vo over/undershoot Vo1/Vo2/Vo3 Vo = 1% Vo1 Vo2 Vo3 All outputs; module shutdown and latch off Over Vin and Io ranges Vin increasing Vin decreasing Referenced to Vin (pin 2)
Transient Response Output Adjust Range Current Limit Threshold Output Over-Voltage Protection Switching Frequency Under Voltage Lockout Enable Control (pins 3 & 4) High-Level Input Voltage Low-Level Input Voltage Low-Level Input Current Standby Input Current Internal Input Capacitance External Output Capacitance Primary/Secondary Isolation Temperature Sense
ttr Vos Voadj ILIM OVP s Von Voff VIH VIL II L Iin standby Cint Cout V iso C iso R iso Vtemp
V mA mA µF µF V pF M V
pins 3 & 4 open circuit Per each output
-- -- 0 1500 -- 10 -- --
-- 5,000 -- -- -- -- --
Output voltage at temperatures:-
40°C 100°C
Notes: (1) Limits are specified by design. (2) This is a fixed parameter. Adjusting Vo1 or Vo2 higher will increase the module's sensitivity to over-voltage detection. For more information, see the application note on output voltage adjustment. (3) The Enable inputs (pins 3 & 4) have internal pull-ups. Leaving pin 4 open-circuit and connecting pin 3 to V in (pin 2) allows the the converter to operate when input power is applied. The maximum open-circuit voltage for the Enable inputs is 5.4V. (4) Voltage output at "TEMP" pin is defined by the equation:- VTEMP = 0.5 + 0.01·T, where T is in °C. See pin descriptions for more information.
For technical support and more information, see inside back cover or visit www.ti.com
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