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GS-R400/2 Family
SMALL SIZE STEP-DOWN SWITCHING REGULATOR FAMILY
FEATURES MTBF in excess of 500,000 hours 4A max output current 40V max input voltage 4V max drop-out voltage Soft start Non-latching short circuit protection Crow-bar output overvoltage protection DESCRIPTION The GS-R400/2 series is a family of small sized high current, high voltage step-down switching regulators. The integral heatsink allows a large power handling capability and it provides also an effective shielding to minimize EMI.
SELECTION CHART
Type Ordering Number GS-R405/2 GS-R412/2 GS-R415/2 GS-R424/2 GS-R400V/2 Output Voltage (V) 5.1 2% 12.0 4% 15.0 4% 24.0 4% 5.1 to 24 Input Voltage (V) 9 to 40 16 to 40 19 to 40 28 to 40 Vo+4 to 40 Output Ripple (mVpp) 25 50 65 100 25 to 100 Regulation Line (mV/V) 2 5 6 6 2 to 6 Load (mV/A) 20 40 60 80 20 to 80 Efficiency Notes (%) 80 85 87 90 80 to 90 Fixed output voltage " " " Progr. output voltage
Note : Line regulation is measured at Iout=1A. Load regulation is measured at Vin=Vo+8V and Iout=0.5 to 1.5A. Case temperature must be kept below 85 C
ABSOLUTE MAXIMUM RATINGS
Symbol Vi Io Tstg Tcop DC Input Voltage Output Current Storage Temperature Range Operating Case Temperature Range Parameter Value 42 4 - 40 to +105 - 20 to +85 Unit V A C C
June 1994
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GS-R400/2 FAMILY
CONNECTION DIAGRAM AND MECHANICAL DATA
Pin 5 GS-R400V/2 only Dimensions in mm Bottom view
PIN DESCRIPTION
Pin 1 2 3 4 5 Function + Input Input GND Output GND + Output Program Description DC input voltage. Recommended maximum voltage is 40V. Return for input voltage source. Return for output current path. Internally connected to pin 2. Regulated DC output voltage. A resistor (<10k) connected between this pin and pin 4 sets the + output voltage of the GS-R400V/2.
ELECTRICAL CHARACTERISTICS (TA = 25C unless otherwise specified)
Symbol Vo/T Io IoL Iisc fs SVR Vr tss tcb Vcth Rth Parameter Temperature Stability Output Current Current Limit Average Input Current Switching Frequency Supply Voltage Rejection Ripple Voltage Soft Start Time Crowbar Delay Time Crowbar Intervention Threshold Thermal Resistance Case to ambient Test Conditions Vi = Vo+8V Io = 1A Vi = Vo+8V Vi = Vo+8V Vi = 40V Output Shorted Io = 1A fo = 100Hz Io = 1A Io = 1A 0.1 5 0.1 100 4/12 25/100 10/35 5 Vo*1.25 8 Min Typ 0.2/0.6 4 8 0.2 Max Unit mV/C A A A kHz mV/V mVpp ms s V C/W
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GS-R400/2 FAMILY
USER NOTES Input Voltage The recommended operating maximum DC input voltage is 40V inclusive of the ripple voltage. Case Grounding The module case is internally connected to pin 2 and pin 3. The PCB area below the module can be used as an effective sixth side shield against EMI. Thermal Characteristics The case-to-ambient thermal resistance of all the GS-R400/2 modules is about 8C/W. This produces a 32C temperature increase of the module surface for 4W of internal power dissipation. Depending on the ambient temperature and/or on the power dissipation, an additional heatsink or forced ventilation may be required. Input Impedance The module has an internal capacitor connected between the input pins in order to assure PWM stability. This capacitor cannot handle large values of high frequency ripple current and it can be permanently damaged if the primary energy source impedance is not adequate. The use of an external low ESR, high ripple current capacitor located as close the module as possible is recommended. Suitable capacitors should have a RMS current capability of 2.5 ARMS with a working voltage of 50 VDC and an ESR of 0,1 at 100kHz. When space is a limitation a 22F ceramic multilayer capacitor must be connected to the module input pins. Output Voltage Programming The GS-R400V/2 output voltage is programmed by using a resistor. The resistor must be located very close the module and the PCB layout must minimize injected noise. The value of the resistor is calculated by using the following formula: V Rv = 2.67 o - 1 k 5.1 Vo can be adjusted between 5.1 and 24V. Module Protection The modules are protected against occasional and permanent short circuits of the output pins to ground. During short circuit (when the output current exceeds the maximum value) the output is automatically disabled. After a fixed time the module starts again in a soft mode. The cycle is repeated until the short circuit condition is removed. The module can be permanently damaged if the case temperature exceeds 85 C Power Derating Curve
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. (c) 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.
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