GS300T48-5 300W DC-DC CONVERTER Vi Vo Io 38 to 60 V 5,075 V 60 A Type GS300T48-5 FEATURES Very high output power (300W) High efficiency (80% min.) Parallel operation with current sharing Synchronization pin Remote ON/OFF Remote load voltage sense compensation Output short-circuit protection Output overvoltage protection Thermal protection Undervoltage lock-out Minimal overshoot during load transients 500 VDC input to output isolation Internal input and output filtering Softstart PCB or chassis mountable DESCRIPTION The GS300T48-5 is a 300W DC-DC converters used to generate a 5.075V isolated output with a current of 60A from a wide range input voltage (38 to 60V). SELECTION GUIDE Type Ordering Number Input Voltage (V) Output Voltage (V) Output Current (A) Dimensions L • W • H mm (inches) 38 to 60 5.075 60 125 • 66.5 • 20 ( 4.92 • 2.62 • 0.79) The suffix E identifies the metric threading on the planar heatsink (see fig. 1). GS300T48-5 GS300T48-5E June 1994 1/6 GS300T48-5 ELECTRICAL CHARACTERISTICS (Tamb = 25°C unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit 48 60 VDC 36 V Input Voltage Vo = 5.075V Io = 0 to 30A (Operating Conditions) 38 Input Undervoltage Lockout Io = 0 to 60A 29 Average Input Current Vi = 48V Io = 60A 7.8 A Inrush Transient Peak Current Vi = 60V Io = 60A 0.3 A2 s Reflected Input Current Vi = 48V Io = 60A BW = 5Hz to 20MHz (see fig. 2) 30 mApp Vien Enable Input Voltage Vi = 38 to 60V Io = 0 to 60A lien Enable Input Current Vi = 38 to 60V Io = 0 to 60A Vien = 0V Max Inhibit Voltage Vi = 38 to 60V Io = 0 to 60A Vien = open Pi Input Power Vi = 38 to 60V Io = 0A (No Load) Vo Total Output Voltage Regulation Vi = 38 to 60V Io = 0 to 60A Vost Short-term Output Voltage Regulation Vots Total Static Output Voltage Regulation Vi Viuv li lipk lir Viinh 0 1.2 V –1 mA 18 V 1.5 2 W 4.490 5.075 5.210 V Vi = 38 to 60V Io = 0 to 60A 5.002 5.075 5.148 V Vi = 38 to 60V Io = 0 to 60A 4.970 5.075 5.180 V 8 Vol Output Overvoltage Limit Initiation Vi = 38 to 60V Io = 0 to 60A Vor Output Ripple Voltage Vi = 38 to 60V Io = 60A BW = 0 to 20 Mhz 50 mVpp Von Output Noise Voltage Vi = 38 to 60V Io = 60A BW = 0 to 20 Mhz 100 mVpp ∆Vo Total Remote Sense Compensation Vi = 38 to 60V 0.6 V δVo Peak Load Transient Response Vi = 48V δIo = 10A slope = 0.1A/µs 100 mVp Io Output Current Vi = 38 to 60V Vo = 5V 60 A Iol Overcurrent Limit Initiation Vi = 48V 63 A 69 A 6.3 0 V Iosc Shortcircuit Output Current Vi = 48V ts Load Transient Setting Time Vi = 48V δIo = 10A slope = 0.1A/µs 250 µs ton Turn-on Time Vi = 38 to 60V Io = 0 to 60A Vien = from high to low 10 ms Vi = 0 to 60V Vien = low 10 Io = 0 to 60A Vis Isolation Voltage fs Switching Frequency Vi = 38 to 60V Io = 0 to 60A 160 180 η Efficiency Vi = 38 to 60V Io = 60A 80 81 % R th Thermal Resistance Case to Ambient 5.2 °C/W Tcop Operating Case Temperature Range* Tstg Storage Temperature Range * Thermal intervention @ Tcop = 85°C 2/6 500 V 200 kHz 0 +70 °C – 40 +105 °C GS300T48-5 CONNECTION DIAGRAM AND MECHANICAL DATA Figure 1. Package U. Dimensions in mm (inches) PIN DESCRIPTION Pin Function Description 1,2 - Vin Negative input voltage. 3,4 + Vin Positive input voltage. Unregulated input voltage (typically 48V) must be applied between pin 1,2-3,4. 5 SYNC Synchronization pin. See figures 3, 4, 5, 6. Open when not used. 6 PARALLEL 7 ON/OFF 8 CASE 9 + SENSE Senses the remote load high side. To be connected to pin 15,16,17 when remote sense is not used. 10 - SENSE Senses the remote load return. To be connected to pin 11,12,13,14 when remote sense is not used. In parallel configuration, take care to connect all -SENSE pins together (see figures 3,4,5,6). 11,12, 13,14 - OUT -5V voltage return. 15,16, 17 + OUT +5V output voltage. Parallel output. See figures 3, 4, 5, 6. Open when not used. The converter is ON (Enable) when the voltage applied to this pin with reference to pin 1,2 is lower than 1,2 V (see Vien). The converter is OFF (Inhibit) for a control voltage in the range of 8 to 18V. When the pin is unconnected the converter is OFF (Inhibit). Case connection pin 3/6 GS300T48-5 USER NOTES Reflected Input Current The reflected input current measurement (lir, see Electrical Characteristics) is performed according to the test set-up of fig. 2. Figure 2. Softstart To avoid heavy inrush current the output voltage rise time is 10ms maximum in any condition of load. Remote Sensing The remote voltage sense compensation range is for a total drop of 0.6V equally shared between the load connecting wires. It is a good practice to shield the sensing wires to avoid oscillations. See the connection diagram on figures 3, 4, 5, 6. Remote ON/OFF The module is controlled by the voltage applied between the ON/OFF pin and -IN pin. The converter is ON (Enable) when the voltage applied is lower than 1.2 V (see Vien on Electrical Characteristics). The converter is OFF (Inhibit) for a control voltage in the range of 8 to 18V (see Viinh). 4/6 When the pin is unconnected the converter is OFF. Maximum sinking current is 1mA. Module Protection The module is protected against occasional and permanent shortcircuits of the output pins to ground, as well as against output current overload. It uses a current limiting protection circuitry, avoiding latch-up problems with certain type of loads. A latching crowbar output overvoltage protection is activated when the output voltage exceeds the typical value of 6.3V (see Electrical Characteristics). A thermal non-latchingprotection disables the module whenever the heatsink temperature reaches about 85°C. Parallel Operation To increase available output regulated power, the module features the parallel connection possibility with equal current sharing and maximum deviation of 10% (two modules in parallel). See the connection diagram on figures 3, 4, 5, 6. GS300T48-5 Figure 3. Figure 4. Figure 5. Figure 6. Thermal Characteristics The case-to-ambient thermal resistance of the GS300T48-5 module is 5.2°C/W typical. It may be decreased, improving the convection cooling, by mounting an external heatsink to the top of the unit heatsink (fig. 9). Six threaded holes, # 4-40 UNC on the standard or # M3 on the E version, 5 mm (0,2”) maximum deep, are provided for this purpose (see fig. 1). 5/6 GS300T48-5 Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. 1994 SGS-THOMSON Microelectronics – All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. 6/6