120W STEP-DOWN SWITCHING REGULATOR Type GS-R1012 FEATURES Wi
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GS-R1012
120W STEP-DOWN SWITCHING REGULATOR
Type GS-R1012
FEATURES Wide input voltage range 36V) High efficiency (90% min.) Parallel operation with current sharing Synchronization Remote inhibit/enable Remote load voltage sense Output short-circuit protection Soft-start chassis mountable DESCRIPTION GS-R1012 step-down switching voltage regulator suitable provide 12V/10A output voltage from wide input voltage range 36V).
ABSOLUTE MAXIMUM RATINGS
Symbol Viinh Tstg Tcop Input Voltage High Inhibit voltage Storage Temperature Range Operating Case Temperature Range Parameter Value +105 Unit
June 1994
GS-R1012
ELECTRICAL CHARACTERISTICS (Tamb 25°C unless otherwise specified)
Symbol Vien Viinh liinh Iosc Parameter Input Voltage Input Current Reflected Input Current Enable Input Voltage Inhibit Input Voltage Inhibit Input Current Output Voltage Output Ripple Voltage Line Regulation Load Regulation Remote Sense Compensation Output Current* Output Current Limiting Short-circuit Output Current Current Sharing Deviation Soft-start Time Line Transient Recovery Time Load Transient Recovery Time Switching Frequency Efficiency Thermal Resistance Case-to-ambient Test Conditions 11.4 10.5 11.5 12.6 Unit mApp mVpp
with external filter 1000µF) =1.5 Viinh modules parallel
Rthc
°C/W
Note: when output current less than 1.5A, output ripple voltage increases discontinuous operation.
GS-R1012
CONNECTION DIAGRAM MECHANICAL DATA
Dimensions (inches).
DESCRIPTION
10,11 Function Input Inhibit Vout Sense Sync Parallel Sense Output Description Return input voltage source. Internally connected 10,11. converter (Enable) when this unconnected voltage applied lower than 1.2V. converter (Inhibit) control voltage range 24V. Input voltage; recommended maximum voltage 36V. External capacitor between mandatory; recommended value 1000µF/50V switching application. +12V output voltage. Senses remote load high side. connected when remote sense used. Synchronization output. figures 1,2,3,4. Take care leave open when used. Parallel output. figures 1,2,3,4. Take care leave open when used. Senses remote load return. connected 10,11 when remote sense used. parallel configuration, take care connect pins together (see figures 1,2,3,4). Return output current path. Internally connected
GS-R1012
USER NOTES Input Voltage recommended operating maximum input voltage inclusive ripple voltage. external ESR, high ripple current capacitor located close module possible mandatory; recommended value 1000µF/50V. Softstart avoid heavy inrush current output voltage rise time typically 15ms condition load. Remote Sensing remote voltage sense compensation range total drop 500mV equally shared between load connecting wires. good practice shield sensing wires avoid oscillations. connection diagram figures
Parallel Operation increase available output regulated power, module features parallel connection possibility with equal current sharing maximum deviation (two modules parallel). connection diagram figures Module Protection module protected against occasional permanent shortcircuits output pins ground, well against output current overload. uses current limiting protection circuitry, avoiding latch-up problems with certain types loads.
Figure
Figure
GS-R1012
Figure Figure
Thermal characteristics: choose heat-sink Sometimes GS-R1012 requires external heat-sink depending both operating temperature conditions power. Before entering into calculations details, some basic concepts will explained better understand problem. thermal resistance between points represented their temperature difference front specified dissipated power, expressed Degree Centigrade Watt (°C/W). GS-R1012 thermal resistance case ambient 7.5°C/W. This means that internal power dissipation will bring case temperature 7.5°C above ambient temperature. maximum case temperature which module provides 75°C (see fig. Let's suppose have GS-R1012 that delivers load current ambient temperature 40°C.
dissipated power this operating condition about 10.4W typical efficiency 92%), case temperature module will
TCase TAmb 10.4 118°C
This value exceeds maximum allowed temperature external heat-sink must added. this purpose four holes (see mechanical drawing) provided metal surface module. calculate this heat-sink, let's first determine what total thermal resistance should TCaseMAX Tamb 3.37°C 10.4
This value resulting value additional heatsink thermal resistance.
GS-R1012
Figure Efficiency Output Current.
Typ. eff.
Figure Output Current case.
GS-R1012
following list help designer select proper commercially available heat-sink. Sometimes more convenient custom made heat-sink that experimently designed tested.
Manufacturers ALUTRONIC
Type PR139 PR140 PR159
Height (mm) 25.5 33.5 25.5
(°C/W)
ASSMAN
V5440 V5805 V5280
AAVID
60885 60660 62355
AUSTERLITZ
KS50 KS100.3
FISCHER
SK16 SK52
BOSARI
LZ50
THERMALLOY
6155 6601 6176 6320
Information furnished believed accurate reliable. However, SGS-THOMSON Microelectronics assumes responsibility consequences such information infringement patents other rights third parties which result from use. license granted implication otherwise under patent patent rights SGS-THOMSON Microelectronics. Specification mentioned this publication subject change without notice. This publication supersedes replaces information previously supplied. SGS-THOMSON Microelectronics products authorized critical components life support devices systems without express written approval SGS-THOMSON Microelectronics. 1994 SGS-THOMSON Microelectronics Rights Reserved SGS-THOMSON Microelectronics GROUP COMPANIES Australia Brazil China France Germany Hong Kong Italy Japan Korea Malaysia Malta Morocco Netherlands Singapore Spain Sweden Switzerland Taiwan Thailand United Kingdom U.S.A.
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