LW020G GE | Alldatasheet
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Technical content
Features
n Low profile: 9.91 mm (0.390 in.) with 0.38 mm standoffs recessed n Wide input voltage range: 36 Vdc to 75 Vdc n Overcurrent protection n Output overvoltage protection n Input-to-output isolation: 1500 Vdc n Operating case temperature range: –40 °C to +110 °C n Remote on/off n Output voltage adjustment: 90% to 110% of VO, nom n JQA Certified to EN60950 n UL* 1950 Recognized, CSA† C22.2 No. 950-95 Certified, VDE‡ 0805 (EN60950, IEC950) Licensed n CE mark meets 73/23/EEC and 93/68/EEC directives§ n Within FCC Class A radiated limits
Description
The LW020 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 outputs are isolated from the input, allowing versatile polarity configura- tions and grounding connections. Built-in filtering for both input and output minimizes the need for external filtering. The modules have a maximum power rating of 20 W at a typical full-load efficiency of up to 85%. * UL is a registered trademark of Underwriters Laboratories, Inc. †CSA is a registered trademark of Canadian Standards Associa- tion. ‡VDE is a trademark of Verband Deutscher Elektrotechniker e.V. §This product is intended for integration into end-use equipment. All the required procedures for CE marking of end-use equip- ment should be followed. (The CE mark is placed on selected products.)
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extended periods can adversely affect device reliability.
- Maximum case temperature varies based on power dissipation. See derating curve, Figure 16, for details.
Table 1. Input Specifications CAUTION: This power module is not internally fused. An input line fuse must always be used. ing is not included; however, to achieve maximum safety and system protection, always use an input line fuse. same type of fuse with a lower rating can be used. Refer to the fuse manufacturer’s data for further information.
Table 2. Output Specifications
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Table 3. Isolation Specifications conditions. See Feature Descriptions and Design Considerations for further information. compatible; signal referenced to VI(–) terminal.
April 2008 36 Vdc to 75 Vdc Inputs; 20 W LW020 Single-Output-Series Power Modules: Feature Specifications (continued) Parameter Device Symbol Min Typ Max Unit Turn-on Delay and Rise Times (at 80% of IO, 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 VI = 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 V O = 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 LW020B All others 110 110 O, nom %VO, nom Output Overvoltage Protection (clamp) LW020G LW020F LW020A LW020B LW020C VO, clamp VO, clamp VO, clamp VO, clamp VO, clamp 2.9 3.9 5.6 13.2 16.5 3.8 5.0 7.0 16.5 20.0 V V V V V
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Figure 1. LW020 Typical Input Characteristics, Figure 2. LW020A, B, C, F, and G Typical Output Figure 3. LW020G Typical Converter Efficiency vs. Figure 4. LW020F Typical Converter Efficiency vs.
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Figure 9. LW020A, B, C, F, and G Typical Output Figure 10. LW020A, B, C, F, and G Typical Output Figure 11. Input Reflected-Ripple Test Setup 50 mm and 75 mm (2 in. and 3 in.) from the module. Figure 12. Peak-to-Peak Output Noise avoid measurement errors due to socket contact resistance. Figure 13. Output Voltage and Efficiency
April 2008 36 Vdc to 75 Vdc Inputs; 20 W LW020 Single-Output-Series Power Modules: Design Considerations Grounding Considerations For standard units, the case is connected internally to VI(+). For units with the case ground pin option, the case is not connected internally allowing the user flexi- bility in grounding. 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 11, 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: n The input source is to be provided with reinforced insulation from any other hazardous voltages, includ- ing the ac mains. n One VI pin and one VO pin are to be grounded or both the input and output pins are to be kept floating. n The input pins of the module are not operator acces- sible. n 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. Output Overvoltage Protection The output overvoltage clamp consists of control cir- cuitry, independent of the primary regulation loop, that monitors the voltage on the output terminals. The con- trol loop of the protection circuit has a higher voltage set point than the primary loop (see Feature Specifica- tions table). In a fault condition, the overvoltage clamp ensures that the output voltage does not exceed V O, clamp, max. This provides a redundant voltage-control that reduces the risk of output overvoltage. 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 remote on/off, device code suffix “1,” 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 14). 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 V on/off = 6 V is 50 µA.
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needed and may degrade the start-up characteristics of the module. Figure 14. 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.
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Figure 17. LW020F and G Power Dissipation vs. Figure 18. LW020A Power Dissipation vs. Output Figure 19. LW020B Power Dissipation vs. Output Figure 20. LW020C Power Dissipation vs. Output
in Figure 21. Note that the module and the printed-wiring board (PWB) that it is mounted on are vertically oriented. The passage has a rectangular cross section. Note: Dimensions are in millimeters and (inches). Figure 21. Experimental Test Setup Copper paths must not be routed beneath the power module standoffs.
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April 200836 Vdc to 75 Vdc Inputs; 20 W LW020 Single-Output-Series Power Modules: Outline Diagram Dimensions are in millimeters and (inches). Copper paths must not be routed beneath the power module standoffs. Note: For standard modules, VI(+) is internally connected to the case. 8-1198(C).g 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 7V O(–) 8V O(+) Side View Bottom View
April 2008 36 Vdc to 75 Vdc Inputs; 20 W LW020 Single-Output-Series Power Modules: Recommended Hole Pattern Component-side footprint. Dimensions are in millimeters and (inches). 8-1198(C).g
Ordering Information
Table 4. Device Codes tion Engineer for pricing and availability. Table 5. Device Options
48 V 5 V 20 W LW020A 107314304
48 V 12 V 20 W LW020B 107681033
48 V 15 V 20 W LW020C 107640799
April 200836 Vdc to 75 Vdc Inputs; 20 W LW020 Single-Output-Series Power Modules: April 2008 DS00-059EPS (Replaces DS00-058EPS) Worl d Wide Headqua rters Lineage Power Corporation
3000 Skyline Drive, Mesquite, TX 75149, USA
+1-800-526-7819 (Ou tsi de U.S.A.: +1-972-284-2626 ) www.line agepower.com e-m ail: techsupport1@linea gepower.com Asia-Pacific Headquarters Tel: +65 6416 4283 Europe, Middle-East and Afric a He adquarters Tel: +49 89 6089 286 India Headquarters Tel: +91 80 28411633 L inea ge Power reserves the right to make chang es to the produ ct(s) o r inf ormation conta ine d he rein withou t no tice. No liability is assu med a s a resu lt o f their use or app lication. No rig hts unde r any pate nt acco mpa ny the sale of a ny su ch p ro duct(s) or informatio n. © 20 08 Lineag e Power Corpo ra tion , (Mesquite, Te xas) All Intern ation al Ri ght s Re se rve d.