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STCS2 Fiches technique(PDF) 10 Page - STMicroelectronics |
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STCS2 Fiches technique(HTML) 10 Page - STMicroelectronics |
10 / 16 page Application information STCS2 10/16 8 Application information 8.1 Reverse polarity protection STCS2 must be protected from reverse connection of the supply voltage. Since the current sunk from VCC pin is in the range of 450 µA a small diode connected to VCC is able to protect the chip. Care must be taken for the whole application circuit, especially for the LEDs, in fact, in case a negative voltage is applied between VIN and GND, a negative voltage will be applied to the LED string that must have a total breakdown voltage higher than the negative applied voltage in order to avoid any damage. 8.2 Thermal considerations The STCS2 is able to control a LED current up to 2 A and able to sustain a voltage on the drain pin up to 40 V. Those operating conditions are however limited by thermal constraints. The poor thermal conduction of epoxy FR4 boards does not permit to benefit of the outstanding thermal performance of the PowerSO-10. In any case one way to improve the thermal conduction is the use of large heat spreader areas at the copper layer of the PC board. This leads to a reduction of thermal resistance to 30 - 36°C/W for 3 to 6 cm2 on-board heatsink. Use of copper-filled through holes on conventional FR4 techniques increases the metallization and decreases thermal resistance accordingly. Using a configuration with 16 holes under the spreader of the package with a pitch of 1.8 mm and a diameter of 0.7 mm, the thermal resistance (junction - heatsink) can be reduced to 12 °C/W. The thermal resistances shown in the Error! Reference source not found. section are the typical ones. The power dissipation in the device can be calculated as follow: PD = (VDRAIN - VFB) x ILED + (VCC x ICC) Figure 11. Reverse polarity condition PWM EN GND V CC DRAIN DISC FB VIN + or similar BAT46 RSENSE SOURCE PWM EN GND V CC DRAIN DISC FB VIN + or similar BAT46 RSENSE SOURCE |
Numéro de pièce similaire - STCS2 |
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Description similaire - STCS2 |
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