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| GS-R51212 20W TRIPLE OUTPUT STEP-DOWN SWITCHING REGULATOR FEATURES MTBF in excess of 200,000 hours 4V max drop-out voltage Soft start Reset output Non-latching short circuit protection Crow-bar output overvoltage protection DESCRIPTION The GS-R51212 is a versatile triple output, high current, high voltage step-down switching regulator module that provides a +5V and two isolated 12V outputs. It is ideal for microprocessor based boards because it powers the logic and the communication ports and it has a Reset output for the correct system start-up. The integral heatsink allows a large power handling capability and it provides also an effective shielding to minimize EMI. MAIN CHARACTERISTICS Vi Vo1 Io1 Vo2 Io2 Vo3 Io3 Input Voltage Output Voltage Output Current Output Voltage Output Current Output Voltage Output Current 9 to 40V 5.1V 3.5A 12V 0.1A 12V 0.1A ABSOLUTE MAXIMUM RATINGS Symbol Vi Irt Tstg Tcop DC Input Voltage Reset Output Sink Current Storage Temperature Range Operating Case Temperature Range Parameter Value 42 20 - 40 to +105 - 20 to +85 Unit V mA C C June 1994 1/5 GS-R51212 ELECTRICAL CHARACTERISTICS (TA = 25C unless otherwise specified) Symbol Vo1 Vo2 Vo3 Vo/T Vi Io1 Io2 Io3 Iisc Iisc Iir Vis fs Vo Vo SVR Vor Von Irh Vrl trd tr1 tr2 tss tcd Vcth Rth Parameter Output Voltage Output Voltage Output Voltage Temperature Stability Input Voltage Output Current Output Current Output Current Average Input Current Average Input Current Reflected Input Current 5V to 12V Isolation Voltage Switching Frequency Efficiency Line Regulation Load Regulation Supply Voltage Rejection Output Ripple Voltage Output Noise Voltage Reset Leakage Current Reset Low Level Reset Delay Time Line Transient Recovery Time Load Transient Recovery Time Soft Start Time Crowbar Delay Time Crowbar Intervention Threshold Thermal Resistance Case to ambient Io1 = 2.5A Vi = 24V Vi = 15 to 35V Io = 0.5 to 2.5A Ireset = 5mA Vi = 24V Io1 = 2.5A Io2,3 = 0.1A Vi = 24V Vi = 24V Vi = 24V Vi = 40V Vi = 40V Vi = 24V Vo1 = 0V Vo1/2/3 = 0V Io1 = 2.5A Io2,3 = 0.1A 200 100 70 2 35 600 4 Io1 = 2.5A Io1 = 2.5A 30 40 100 0.2 100 500 200 10 5 6.37 5 0.1 0.1 200 Vi = 24V Vi=24V Vi = 24V All Outputs 9 0.5 Test Conditions Io1 = 2.5A Io2 = 0.1A Io3 = 0.1A Min 4.95 11.5 11.5 0.2 40 3.5 0.1 0.1 0.2 0.2 Typ 5.1 Max 5.2 12.5 12.5 Unit V V V mV/C V A A A A A mApp VDC kHz % mV/V mV/A mV/V mVpp mVpp A V ms s s ms s V C/W Io1 = 2.5A Vi = 15 to 25V Io2,3 = 0.1A Vi = 24V Vi = 24V 50/60Hz Vi = 24V Vi = 24V Io1 = 0.5 to 2.5A Io2,Io3 = 0.05 to 0.1A 2/5 GS-R51212 CONNECTION DIAGRAM AND MECHANICAL DATA Dimensions in mm Bottom view PIN DESCRIPTION Pin 1 2 3 4 5 6 7 8 9 Function Output 1 Output GND Output 2 Ground 2 Output 3 Ground 3 Reset Input GND + Input Regulated 5.1V output. Return for output1 current path. Internally connected to pin 8. Regulated 12V output. Return of output 3 current path. Regulated 12V output. Return of output 3 current path. Open collector Reset output. Return of input voltage source. Internally connected to pin 2. DC input voltage. Recommended maximum voltage is 40V. Description 3/5 GS-R51212 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 8. 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 the GS-R51212 module is about 5C/W. This produces a 50C temperature increase of the module surface for a 10W 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 to 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 100 kHZ. When space is a limitation, a 22F ceramic multilayer capacitor must be connected to the module input pins. Module Protection The module is protected against occasional and permanent short circuits of the output pins to ground, as well as against output current overload. When the output current at 5V output 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 overload condition is removed. A crow-bar output overvoltage protection is activated when the output voltage on Vo1 exceeds 6.37V. Output Current The output current of the main output is 3.5A. The max output current of the two 12V outputs is a function of the input voltage and of the main output current as shown in fig. 1. If the main current is zero, no voltage will be available on the 12V outputs. 4/5 Figure 1. Output Current Capability vs. Operating Conditions Figure 2. Reset Operation Figure 3. Typical application GS-R51212 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. 5/5 |
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