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Part: PT4842N
Category:
Power Management
-> Plug-in Power Solutions->Isolated->Multiple Output
Description: ti PT4842, 12V/3.3V/1.8V 48V-Input 62-Watt Triple-output DC/DC Converter
Company: Texas Instruments, Inc.
Datasheet: Download PT4842N datasheet File size : 84 kB
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Datasheet text preview:
PT4840 Series--48V
65-W Triple Output Isolated DC/DC Converter for DSL Applications
SLTS142C - DECEMBER 2000 -REVISED SEPTEMBER 2002
Features
· DSL Triple Outputs (Independantly Regulated) · Input Voltage Range: 36V to 75V · 1500VDC Isolation · On/Off Control · Current Limit · Short Circuit Protection (All Outputs) · · · · Fixed Frequency Operation Over-T mperature Shutdown e Under-Voltage Lockout Space Saving Package: 1.9 sq. in. PCB Area (suffix N) · Solderable Copper Case · Safety Approvals: UL60950 CSA 22.2 950 VDE EN60950
Description
The PT4840 ExcaliburTM power modules are a series of isolated tripleoutput DC/DC converters that operate from a standard (48V) central office supply. Rated for up to 65W, these regulators are appropriate for powering both analog and mixedsignal circuitry. A typical application is a chip-set for an ADSL/DSL line card. The output voltage combinations offered by the PT4840 series provide power for a low-voltage processor core, the associated digital circuitry, and analog support circuitry. The PT4840 series incorporates many features to simplify system integration. These include a flexible On/Off control, over-temperature p rotection, and an input undervoltage lock-out. All outputs are c u r r e n t limited and short-circuit protected. In addition, the lowvoltage outputs for processor core and digital circuitry meet the powerup and power-down sequencing requirements of popular DSP ICs. The PT4840 series is housed in a space-saving solderable case. The module requires no external heat sink and can occupy as little as 1.97 in2 of PCB area.
Ordering Information
PT4841o = +15/+3.3/+1.5V (65W) PT4842o = +12/+3.3/+1.8V (62W)
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)
Typical Application
Vo2 Adjust Vo3 Adjust 21 Vo3adj +VIN 1 +VIN 17 Vo2adj Vo1 11 +15VDC COUT1
PT4841
COM 12,13 4 CIN 3 EN 1 EN 2 Vo2 Vo3 VIN 2 VIN 15,16 22,23
DSL/ADSL IC Chip Set
+3.3VDC +1.5VDC COUT2
COUT3 COM 1820
Cin = Optional Cout = Optional; See specifications EN1 & EN2 pins: See On/Off Enable Logic
For technical support and more information, see inside back cover or visit www.ti.com
PT4840 Series--48V
65-W Triple Output Isolated DC/DC Converter for DSL Applications
SLTS142C - DECEMBER 2000 -REVISED SEPTEMBER 2002
Environmental Specifications
Characteristics Operating T mperature Range e Over-T mperature Protection e Solder Reflow T mperature e Storage T mperature e Mechanical Shock Mechanical Vibration Weight Flammability -- -- Symbols Ta OTP Treflow Ts Conditions Over Vin Range Case temperature Surface temperature of module pins or case -- Per Mil-STD-883D, Method 2002.3 1 msec, ½ Sine, mounted Mil-STD-883D Method 2007.2 Suffix N 20-2000 Hz Suffix A, C Vertical/Horizontal Meets UL 94V-O Min 40 100 -- 40 -- -- -- -- Typ -- -- -- -- 500 10 (iii) 20 (iii) 90 Max 85 (i) -- 215 (ii) 125 -- -- -- -- Units °C °C °C °C G's G's grams
Notes: (i) See SOA curves or consult factory for appropriate derating. (ii) During solder reflow of SMD package version do not elevate the module case, pins, or internal component temperatures above a peak of 215°C. For further guidance refer to the application note, "Reflow Soldering Requirements for Plug-in Power Surface Mount Products," (SLTA051). (iii) Only 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 Do Not Connect Do Not Connect Pin Not Present Pin Not Present
On/Off Enable Logic
Pin Function
10 11 12 13 14 15 16 17 Pin Not Present +Vo1 COM COM Pin Not Present +Vo2 +Vo2 Vo2 adjust
Pin Function
18 19 20 21 22 23 24 25 26 COM COM COM Vo3 adjust +Vo3 +Vo3 Pin Not Present Do Not Connect Do Not Connect
Pin 3 1 0 ×
Pin 4 × 1 0
Output Status Off On Off
Notes: Logic 1 =Open collector 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, EN 2, and TEMP 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 is referenced to Vin. A low-level voltage at this pin enables the module's outputs, and a high impedance impedance disables the module's outputs. If not used, the pin must be connected to Vin. EN 2: The positive logic input that activates the module output. This pin is referenced to Vin. A high impedance at this pin enables the module's outputs. If not used, the pin should be left open circuit. 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. The output may be used to power analog support circuitry. Vo 2: The regulated output that is designed to power logic or I/O circuitry. It is referenced to the COM node. Vo 3: The low-voltage regulated output that provides power for a micro, processor, ASIC, 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. Vo2 Adjust: Using a single resistor, this pin allows Vo2 to be adjusted higher or lower than the preset value. If not used, this pin should be left open circuit. Vo3 Adjust: Using a single resistor, this pin allows Vo3 to be adjusted higher or lower than the preset value. If not used, this pin should be left open circuit.
For technical support and more information, see inside back cover or visit www.ti.com
PT4841--48V
65-W Triple Output Isolated DC/DC Converter for DSL Applications
SLTS142C - DECEMBER 2000 -REVISED SEPTEMBER 2002
PT4841 Electrical Specifications
Characteristics Output Power Symbols Po
(Unless otherwise stated, the operating conditions are:- Ta =25°C, V in =48V, and Io n =0.5Ionmax) Conditions Each output: T tal (all three outputs) o Vo1 ( 15V) Vo2 (3.3V) Vo3 (1.5V) Io1 ( 15V) Io2 (3.3V) Io3 (1.5V) Maximum (Io2 + Io3) Min -- -- -- -- 0 0 0 -- 36 -- -- -- -- -- -- -- -- 15 3.2 1.45 -- -- -- -- -- -- ±10 -- -- -- 450 -- -- 4.0 0.2 -- -- -- 0 0 0 -- -- 1500 -- 10
PT4841 Typ
-- -- -- -- -- -- -- -- -- 15.2 3.3 1.5 ±0.5 ±0.8 0.1 0.2 -- -- -- -- 85 50 20 20 30 5 -- 4 16 200 500 34 32 -- -- 0.16 8 2 -- -- -- 0.1 (8) 1.5 (8) -- 1500 --
(5)
Max 41 (1) 20 (1) 10.5 (1) 65 (1) 2.7 6 (2) 7 (2) 11 (2) 75 -- -- -- -- -- 0.5 0.5 1.0 15.75 (3) 3.4 (3) 1.55 (3) -- 100 (4) 50 (4) 50 (4) -- -- -- -- -- -- 550 -- -- 70 (6) 0.8 (6) 0.25 10 -- 330 5,000 10,000 -- -- -- -- --
(7) (7) (7) (3)
Units W W A A V V %Vo %Vo %Vo %Vo V % mVpp µSec %Vo %Vo A ms kHz V
Output Current
Io
Input Voltage Range Set-Point Voltage Temperature Variation Line Regulation Load Regulation Cross Regulation Total Output Voltage Variation Efficiency Vo Ripple/Noise (0 to 20MHz bandwidth) Transient Response Output Adjust Range Current Limit Threshold Over Current Shutdown Delay Switching Frequency Under Voltage Lockout Enable Control (pins 2 & 3) High-Level Input Voltage Low-Level Input Voltage Low-Level Input Current Standby Input Current Internal Input Capacitance External Output Capacitance
Vin Vo Regtemp Regline Regload Regcross Vo tol Vn ttr Vos Voadj ILIM tsd s Von Voff VIH VIL II L Iin standby Cint Co1 Co2 Co3 Vtemp V iso C iso R iso 40°C Ta +85°C, Io =Iomin All outputs, Over Vin range All outputs, 0IoIomax Any one output vs. other outputs Includes set-point, line, load, 40°C Ta +85°C Po =Pomax Co1/Co2/Co3 =10µF 0.1A/µs load step, 50% to 75% Iomax Vo over/undershoot
Vo1 Vo2 Vo3 Vo1 Vo2/Vo3
Vo1 Vo2 Vo3 Vo1 Vo2 Vo3
Vo2 / Vo3 Io1 Io2 + Io3 Time period prior to latched shutdown Over Vin and Io ranges Vin increasing Vin decreasing Referenced to Vin (pin 2)
V mA mA µF µF V V pF M
Vin =75V pins 2 & 4 connected
Temperature Sense Primary/Secondary Isolation
Output voltage at temperatures:-
40°C 100°C
Notes: ( 1 ) (2) (3) (4) (5) (6)
The sum total power delivered from all three regulated outputs, Vo1, Vo2, and Vo3, cannot exceed 65 watts. The sum-total current from outputs Vo2, and Vo3 cannot exceed 11ADC. Limits are guaranteed by design. The ripple and noise is measured with a 10µF tantalum capacitor across each output. After latched shutdown, the module may be reset cycling the input power. The Enable inputs (pins 3 & 4) have internal pull-ups. Leaving pin 4 open-circuit and connecting pin 3 to V in allows the the converter to operate when input power is applied. The maximum open-circuit voltage is 5.1V. (7) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. For more information refer to the application note regarding capacitor selection. (8) Voltage output at "TEMP" pin is defined by the equation:- VTEMP = 0.5 + 0.01·T, where T is the sensed temperature in degrees centigrade. 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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