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GS-R51212 Datasheet(PDF) 4 Page - STMicroelectronics |
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GS-R51212 Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 5 page 4/5 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 5 °C/W. This produces a 50 °C 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 possi- ble 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 Ω at 100 kHZ. When space is a limitation, a 22 µF ce- ramic 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 dis- abled. 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 acti- vated 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 avail- able on the 12V outputs. Figure 1. Output Current Capability vs. Operat- ing Conditions Figure 2. Reset Operation Figure 3. Typical application GS-R51212 |
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