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EUP7962-15LAIR1 Datasheet(PDF) 10 Page - Eutech Microelectronics Inc |
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EUP7962-15LAIR1 Datasheet(HTML) 10 Page - Eutech Microelectronics Inc |
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10 / 15 page  EUP7962 DS7962 Ver 1.4 Oct. 2007 10 Power Dissipation EUP7962 can deliver a continuous current of 2A over the full operating temperature range. A heatsink may be required depending on the maximum power dissipation and maximum ambient temperature of the application. Under all possible conditions, the junction temperature must be within the range specified under operating conditions. The total power dissipation of the device is given by: ( ) ( ) GND I IN V OUT I OUT V IN V D P + − = Where IGND is the operating ground current of the device (specified under Electrical Characteristics). The maximum allowable temperature rise (TRmax) depends on the maximum ambient temperature (TAmax) of the application, and the maximum allowable junction temperature (TJmax): TRmax= TJmax-TAmax The maximum allowable value for junction to ambient Thermal Resistance, θJA , can be calculated using the formula: θJA =TRmax/PD PCB Layout Good PC layout practices must be used or instability can be induced because of ground loops and voltages drops. The input and output capacitors must be directly connected to the input, output, and ground pins of the regulator using traces which do not have other currents flowing in them. The best way to do this is to lay out CIN and COUT near the device with short traces to the VIN, VOUT, and ground pins. The regulator ground pin should be connected to the external circuit ground so that the regulator and its capacitors have a “single point ground”. It should be noted that stability problems have been seen in applications where “vias” to an internal ground plane were used at the ground points of the IC and the input and output capacitors. This was caused by varying ground potentials at these nodes resulting from current flowing through the ground plane. Using a single point ground technique for the regulator and it’s capacitors fixed the problem. Since high current flows through the traces going into VIN and coming from VOUT, Kelvin connect the capacitor leads to these pins so there is no voltage drop in series with the input and output capacitors. |
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