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GS-R1012

120W STEP-DOWN SWITCHING REGULATOR

GS-R1012
120W STEP-DOWN SWITCHING REGULATOR
Type GS-R1012 Vi 18 to 36 V Vo 12 V Io 10 A
ABSOLUTE MAXIMUM RATINGS
Symbol Vi Viinh Tstg Tcop DC Input Voltage High Inhibit voltage Storage Temperature Range Operating Case Temperature Range Parameter Value 40 28 - 20 to +105 0 to +75 Unit V V °C °C
June 1994
GS-R1012
tss tr1 tr2 fs R thc
Note: when output current is less than 1.5A, output ripple voltage increases due to discontinuous operation.
GS-R1012
CONNECTION DIAGRAM AND MECHANICAL DATA
Dimensions in mm (inches).
PIN DESCRIPTION
Pin 1 2 3 4, 5 6 7 8 9 10, 11 Function GND Input Inhibit + Vin + Vout + Sense Sync Parallel - Sense GND Output Description Return for input voltage source. Internally connected to pin 10, 11. The converter is ON (Enable) when this pin is unconnected or the voltage applied is lower than 1.2V. The converter is OFF (Inhibit) for a control voltage in the range of 2 to 24V. DC Input voltage recommended maximum voltage is 36V. External capacitor between pin 3 and pin 1 is mandatory recommended value is 1000µF / 50V for switching application. +12V output voltage. Senses the remote load high side. To be connected to pin 4, 5 when remote sense is not used. Synchronization output. See figures 1, 2, 3, 4. Take care to leave the pin open when is not used. Parallel output. See figures 1, 2, 3, 4. Take care to leave the pin open when is not used. Senses the remote load return. To be connected to pin 10, 11 when remote sense is not used. In parallel configuration, take care to connect all -S pins together (see figures 1, 2, 3, 4). Return for output current path. Internally connected to pin 1.
GS-R1012
USER NOTES Input Voltage The recommended operating maximum DC input voltage is 36V inclusive of the ripple voltage. The use of an external low ESR, high ripple current capacitor located as close the module as possible is mandatory recommended value is 1000µF / 50V. Softstart To avoid heavy inrush current the output voltage rise time is typically 15ms in any condition of load. Remote Sensing The remote voltage sense compensation range is for a total drop of 500mV 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 1, 2, 3, 4.
Figure 1.
Figure 2.
GS-R1012
Figure 3. Figure 4.
GS-R1012
Figure 5. - Efficiency vs. Output Current.
Figure 6. - Output Current vs. T case.
GS-R1012
The following list may help the designer to select the proper commercially available heat-sink. Sometimes it can be more convenient to use a custom made heat-sink that can be experimently designed and tested.
Manufacturers ALUTRONIC
Type PR139 PR140 PR159
Height (mm) 20 19 20 19 15 19 14 25.5 33.5 12 15 25.5 19 21 24 14 14 24 30
ASSMAN
V5440 V5805 V5280
AAVID
AUSTERLITZ
KS50 KS100.3
FISCHER
SK16 SK52
SGE BOSARI
L30 LZ50
THERMALLOY