140W STEP-DOWN SWITCHING REGULATOR FAMILY FEATURES MTBF excess 20

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140W STEP-DOWN SWITCHING REGULATOR FAMILY FEATURES MTBF excess 20

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GS-R400 Family
140W STEP-DOWN SWITCHING REGULATOR FAMILY
FEATURES MTBF excess 200,000 hours output current input voltage drop-out voltage Soft start Remote logic inhibit/enable Remote output voltage sense Non-latching overload short circuit protection Crow-bar output overvoltage protection DESCRIPTION GS-R400 series versatile family high current, high voltage step-down switching voltage regulators. integral heatsink allows large power handling capability provides also effective shielding minimize EMI. SELECTION CHART
Type Ordering Number GS-R405 GS-R412 GS-R415 GS-R424 GS-R405S GS-R400V GS-R400VB Output Voltage 12.0 15.0 24.0 Input Voltage Vo+4 Vo+4 Output Ripple (mVpp) Regulation Line (mV/V) Load (mV/A) Efficiency Notes Fixed output voltage Reset output Progr. output voltage Progr. output voltage current. Frequency synchr.
Note: line regulation measured Iout=1A load regulation measured Vin=Vo+8V Iout=1 external heatsink forced ventilation required.
ABSOLUTE MAXIMUM RATINGS
Symbol Irt* Tstg Tcop Input Voltage Reset Output Sink Current Storage Temperature Range Operating Case Temperature Range Parameter Value +105 Unit
GS-R405S only
June 1994
GS-R400 FAMILY
CONNECTION DIAGRAM MECHANICAL DATA
GS-R405S only 5,6,7 GS-R400VB only GS-R400V/VB only
Dimensions
Bottom view
DESCRIPTION
Function Inhibit Reset Input Input Oscillator Sync Current limiting Output Sense Sense Output Program Description module disabled high logic level applied this pin. Reset output (GS-R405S only). input voltage. Recommended maximum voltage 46V. Return input voltage source. 100kHz oscillator output. connected Sync (pin input unit master left open slave (GS-R400VB only). fig. Synchronization input. connected Oscillator output (pin master (GSR400VB only). fig. resistor 2.2k) connected from this sets current limiting level (GS-R400VB only). Return output current path. Internally connected Senses remote load return. Must tied when remote sensing feature used. fig. Senses remote load high side. Must tied when remote load sensing feature used. fig. Regulated output voltage. resistor 18k) connected between this sets output voltage (GS-R400V GS-R400VB only).
GS-R400 FAMILY
ELECTRICAL CHARACTERISTICS 25°C unless otherwise specified)
Symbol Iisc Vinhl Vinhh Iinhh Vrh* Vrl* trd* Vcth Parameter Temperature Stability Output Current Current Limit Average Input Current Switching Frequency Supply Voltage Rejection Ripple Voltage Soft Start Time Inhibit Voltage High Inhibit Voltage High Inhibit Input Current Crow-bar Delay Time Reset High Level Reset Level Reset Delay Time Crowbar Intervention Threshold Total Remote Sense Compensation Thermal Resistance Case ambient 10mA Vinh Test Conditions Vo+8V Vo+8V Vo+8V Output Shorted 100Hz Vo+8V 4/12 25/150 10/35 0.2/1.6 Unit mv/°C mV/V mVpp °C/W
GS-R405S only
USER NOTES Input Voltage recommended operating maximum input voltage inclusive ripple voltage. Remote Sensing remote voltage sense compensation range total drop 500mV equally shared between load connecting wires. good practice shield sensing wires avoid oscillation. Each sense input must connected companion output power when remote sense capability used (see fig. Case Grounding module case isolated from electrical circuit switching regulator. grounded using corner pins. area below module used effective sixth side shield against EMI.
Thermal Characteristics case-to-ambient thermal resistance GS-R400 modules about 5°C/W. This produces 50°C temperature increase module surface internal power dissipation. Depending ambient temperature and/or power dissipation, additional heatsink forced ventilation required. Input Impedance module internal capacitor connected between input pins order assure stability. This capacitor cannot handle large values high frequency ripple current permanently damaged primary energy source impedance adequate. external ESR, high ripple current capacitor located close module possible recommended. Suitable capacitors should have current capability 2.5ARMS with working voltage kHz. When space
GS-R400 FAMILY
limitation, 22µF ceramic multilayer capacitor must connected module input pins. Output Voltage Programming GS-R400V GS-R400VB output voltage programmed using resistor (see function table fig. resistor must located very close module layout must mimimize injected noise. value resistor calculated using following formula: 2.67 adjusted between 40V. Current Limiting Programming GS-R400VB current limiting programmed using resistor (see function table fig. Figure Load Connection value resistor calculated using following formula: [2.2 Module Protection modules protected against occasional permanent short circuits output ground, well against output current overload. When output current exceeds maximum value, output automatically disabled. After fixed time module starts again soft mode. cycle repeated until overload condition removed. crowbar output overvoltage protection activated whenever output voltage exceeds nominal output voltage more than 25%.
Figure Remote Inhibit Operation
Figure Reset Operation
GS-R400 FAMILY
Figure Voltage Current Programming Figure Multiple Units Synchronization
Information furnished believed accurate reliable. However, SGS-THOMSON Microelectronics assumes responsibility consequences such information infringemen 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 component 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.

140W STEP-DOWN SWITCHING REGULATOR FAMILY FEATURES MTBF excess 20

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