LW025 MACOM | Alldatasheet
Document overview
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Technical content
Features
■ Low profile: 9.91 mm (0.390 in.) with 0.38 mm standoffs recessed ■ Wide input voltage range: 36 Vdc to 75 Vdc ■ Input-to-output isolation ■ Operating case temperature range: –40 °C to +110 °C ■ Metal case ■ Overcurrent protection ■ Remote on/off ■ Output voltage adjust: 90% to 110% of VO, nom ■ Output overvoltage protection ■ UL* 1950 Recognized, CSA† C22.2 No. 950-95 Certified, VDE 0805 (EN60950, IEC950) Licensed ■ CE mark meets 73/23/EEC and 93/68/EEC directives ■ Within FCC and EN55022 (CISPR 22) Class A radiated limits
Applications
■ Distributed power architectures ■ Telecommunications
Description
The LW025 Single-Output-Series Power Modules are low-profile dc-dc converters that operate over an input voltage range of 36 Vdc to 75 Vdc and provide precisely regulated outputs. The output is isolated from the input, allowing versatile polarity configurations and grounding connections. The module has a maximum power rating of 25 W at a typical full-load efficiency of 79%. The power modules feature remote on/off and output voltage adjustments of 90% to 110% of the nominal out- put voltage. Built-in filtering for both input and output minimizes the need for external filtering. * UL is a registered trademark of Underwriters Laboratories, Inc. † CSA is a registered trademark of Canadian Standards Association. ‡ This product is intended for integration into end-use equipment. All the required procedures for CE marking of end-use equipment should be followed. (The CE mark is placed on selected products.)
extended periods can adversely affect device reliability.
- Maximum case temperature varies based on power dissipation. See derating curves, Figures 15—16, for details.
Table 1. Input Specifications CAUTION: This power module is not internally fused. An input line fuse must always be used. safety agencies require a normal-blow fuse with a maximum rating of 5 A (see Safety Considerations section). type of fuse with a lower rating can be used. Refer to the fuse manufacturer’s data for further information.
Table 2. Output Specifications Table 3. Isolation Specifications
4 Tyco Electronics Corp. Advance Data Sheet March 199936 Vdc to 75 Vdc Inputs; 25 W LW025 Single-Output-Series Power Modules: Feature Specifications Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. See Feature Descriptions and Design Considerations for further information. Parameter Device Symbol Min Typ Max Unit Remote On/Off Signal Interface: (VI = 0 V to VI, max; open collector or equivalent compatible; signal referenced to VI(–) terminal. See Figure 13 and Feature Descriptions.): Negative Logic: Device Code Suffix “1”: Logic Low—Module On Logic High—Module Off Positive Logic: If Device Code Suffix “1” Is Not Specified: Logic Low—Module Off Logic High—Module On Module Specifications: On/Off Current: Logic Low On/Off Voltage: Logic Low Logic High (I on/off = 0) Open Collector Switch Specifications: Leakage Current During Logic High (Von/off = 10 V) Output Low Voltage During Logic Low (Ion/off = 1 mA) All All All All All Ion/off Von/off Von/off Ion/off Von/off –0.7 1.0 1.2 1.2 mA V V µA V Turn-on Delay and Rise Times (at 80% of I O, max; TA = 25 °C): Case 1: On/Off Input Is Set for Unit On and Then Input Power Is Applied (delay from point at which V I = 48 V until VO = 10% of VO, nom). Case 2: 48 V Input Is Applied for at Least One Second, and Then the On/Off Input Is Set to Turn the Module On (delay from point at which on/off input is toggled until VO = 10% of VO, nom). Output Voltage Rise Time (time for VO to rise from 10% of VO, nom to 90% of VO, nom) Output Voltage Overshoot (at 80% of IO, max; TA = 25 °C) All All All All Tdelay Tdelay Trise 1.5 3.0 ms ms ms Output Voltage Set-point Adjustment Range All — 90 — 110 %V O, nom Output Overvoltage Protection (clamp) LW025F LW025A VO, clamp VO, clamp 3.9 5.6 5.0 7.0 V V
36 Vdc to 75 Vdc Inputs; 25 W
Figure 1. LW025F Typical Input Characteristics Figure 2. LW025A Typical Input Characteristics Figure 3. LW025F Typical Output Characteristics Figure 4. LW025A Typical Output Characteristics
88 Tyco Electronics Corp. Advance Data Sheet March 199936 Vdc to 75 Vdc Inputs; 25 W LW025 Single-Output-Series Power Modules: Design Considerations Grounding Considerations For modules without the isolated case ground pin option, the case is internally connected to the VI(+) pin. For modules with the isolated case ground pin, device code suffix “7,” the V I(+) pin is not connected to the case. Input Source Impedance The power module should be connected to a low ac- impedance input source. Highly inductive source impedances can affect the stability of the power mod- ule. For the test configuration in Figure 10, a 33 µF electrolytic capacitor (ESR < 0.7 ¾ at 100 kHz) mounted close to the power module helps ensure sta- bility of the unit. For other highly inductive source impedances, consult the factory for further application guidelines. Safety Considerations For safety-agency approval of the system in which the power module is used, the power module must be installed in compliance with the spacing and separation requirements of the end-use safety agency standard, i.e., UL 1950, CSA C22.2 No. 950-95, and VDE 0805 (EN60950, IEC950). If the input source is non-SELV (ELV or a hazardous voltage greater than 60 Vdc and less than or equal to
75 Vdc), for the module's output to be considered
meeting the requirements of safety extra-low voltage (SELV), all of the following must be true: ■ The input source is to be provided with reinforced insulation from any other hazardous voltages, includ- ing the ac mains; and ■ One VI pin and one VO pin are to be grounded or both the input and output pins are to be kept floating; and ■ The input pins of the module are not operator acces- sible; and ■ Another SELV reliability test is conducted on the whole system, as required by the safety agencies, on the combination of supply source and the subject module to verify that under a single fault, hazardous voltages do not appear at the module's output. Note: Do not ground either of the input pins of the module without grounding one of the output pins. This may allow a non-SELV voltage to appear between the output pins and ground. The power module has extra-low voltage (ELV) outputs when all inputs are ELV. The input to these units is to be provided with a maxi- mum 5 A normal-blow fuse in the ungrounded lead. Feature Descriptions Overcurrent Protection To provide protection in a fault (output overload) condi- tion, the unit is equipped with internal current-limiting circuitry and can endure current limiting for an unlim- ited duration. At the point of current-limit inception, the unit shifts from voltage control to current control. If the output voltage is pulled very low during a severe fault, the current-limit circuit can exhibit either foldback or tailout characteristics (output-current decrease or increase). The unit operates normally once the output current is brought back into its specified range. Remote On/Off Two remote on/off options are available. Positive logic remote on/off turns the module on during a logic-high voltage on the REMOTE ON/OFF pin, and off during a logic low. Negative logic, device code suffix “1,” remote on/off turns the module off during a logic high and on during a logic low. To turn the power module on and off, the user must supply a switch to control the voltage between the on/off terminal and the V I(–) terminal (Von/off). The switch can be an open collector or equivalent (see Fig- ure 13). A logic low is Von/off = –0.7 V to 1.2 V. The max- imum Ion/off during a logic low is 1 mA. The switch should maintain a logic-low voltage while sinking 1 mA. During a logic high, the maximum Von/off generated by the power module is 6 V. The maximum allowable leak- age current of the switch at Von/off = 6 V is 50 µA. The module has internal capacitance to reduce noise at the ON/OFF pin. Additional capacitance is not gen- erally needed and may degrade the start-up character- istics of the module.
Figure 13. Remote On/Off Implementation external resistor between the TRIM pin and VO(–) pin (Radj-up), VO, adj increases. voltage is adjusted down, the minimum required output current can increase.
Figure 14. Case Temperature Measurement
Figure 15. LW025F Forced Convection Power Figure 16. LW025A Forced Convection Power Figure 17. LW025F Power Dissipation vs. Output Figure 18. LW025A Power Dissipation vs. Output
6 VI = 75 V
Note: Dimensions are in millimeters and (inches). Figure 19. Experimental Test Setup
Tyco Electronics Corp. 13 Advance Data Sheet March 1999 36 Vdc to 75 Vdc Inputs; 25 W LW025 Single-Output-Series Power Modules: Outline Diagram Dimensions are in millimeters and (inches). Note: For standard modules, VI(+) is internally connected to the case. 8-1198(C).f Top View Pin Function 1R e m o t e On/Off
2 No Connec-
tion (sync fea- ture optional) 3V I(–) 4V I(+)
5 Case Pin
(pin optional) 6T r i m 7 – Output 8 + Output Side View Bottom View 50.8 (2.00) 50.8 (2.00) CASE PIN (OPTIONAL) TRIM ON/OFF NC IN LW025A871 DC-DC CONVERTER MADE IN USA OUT IN:DC 36-75V, 1.20A OUT:DC 5.0V, 5.0A 9.91 ± 0.38 (0.390 ± 0.015) 0.38 ± 0.13 (0.015 ± 0.005) STANDOFFS 1.78 x 0.51 THICK (0.070 x 0.020),
4 PLACES
4.70 (0.185) MIN 1.02 (0.040) DIA SOLDER-PLATED BRASS, ALL PINS 20.3 (0.80) 2.5 (0.10) 22.9 (0.90) 5.08 (0.200) 5.08 (0.200) 5.08 (0.200) 2.5 (0.10) REF 10.16 (0.400) 10.16 (0.400)1 45.72 ± 0.38 (1.800 ± 0.015) 5.08 (0.200)
14 Tyco Electronics Corp. Advance Data Sheet March 199936 Vdc to 75 Vdc Inputs; 25 W LW025 Single-Output-Series Power Modules: Recommended Hole Pattern Component-side footprint. Dimensions are in millimeters and (inches). 8-1198(C).f
Ordering Information
Table 4. Device Codes tion Engineer for pricing and availability. Table 5. Option Codes
48 V 5 V 25 W LW025A TBD
Tyco Electronics Corp. 15 Advance Data Sheet March 1999 36 Vdc to 75 Vdc Inputs; 25 W LW025 Single-Output-Series Power Modules: Notes
March 199936 Vdc to 75 Vdc Inputs; 25 W LW025 Single-Output-Series Power Modules: Printed on Recycled Paper Tyco Electronics Power Systems, Inc.
3000 Skyline Drive, Mesquite, TX 75149, USA
+1-800-526-7819 FAX: +1-888-315-5182 http://power.tycoelectronics.com T yco Electronics Corporation reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application. No rights under any patent accompany the sale of any such product(s) or information. © 2001 T yco Electronics Corporation, Harrisburg, PA. All International Rights Reserved. Printed in U.S.A. March 1999 DS98-052EPS