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A6262KLYTR-T Datasheet(PDF) 7 Page - Allegro MicroSystems |
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A6262KLYTR-T Datasheet(HTML) 7 Page - Allegro MicroSystems |
7 / 15 page Automotive LED Array Driver A6262 7 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com As the junction temperature of the A6262 increases, the regulated current level is reduced, reducing the dissipated power in the A6262 and in the LEDs. The current is reduced from the 100% level at typically 4% per degree Celsius until the point at which the current drops to 25% of the full value, defined at TJL. Above this temperature the current will continue to reduce at a lower rate until the temperature reaches the overtemperature shutdown threshold temperature, TJF. The temperature at which the current reduction begins can be adjusted by changing the voltage on the THTH pin. When THTH is left open the temperature at which the current reduction begins is defined as the thermal monitor activation temperature, TJM, and is specified, in the characteristics table, at the 90% current level. TJM will increase as the voltage at the THTH pin, VTHTH, is reduced and is defined as approximately: 0.0039 = TJM (°C) 1.46 –VTHTH (3) A resistor connected between THTH and GND will reduce VTHTII and increase TJM. A resistor connected between THTH and a refer- ence supply greater than 1 V will increase VTHTH and reduce TJM. Figure 3 shows how the nominal value of the thermal monitor activation temperature varies with the voltage at THTH and with either a pull-down resistor, RTH, to GND or with a pull-up resis- tor, RTH, to 3 V and to 5 V. In extreme cases, if the chip temperature exceeds the overtem- perature limit, TJF, all regulators will be disabled. The tempera- ture will continue to be monitored and the regulators re-activated when the temperature drops below the threshold provided by the specified hysteresis. Note that it is possible for the A6262 to transition rapidly between thermal shutdown and normal operation. This can hap- pen if the thermal mass attached to the exposed thermal pad is small and TJM is increased to close to the shutdown temperature. The period of oscillation will depend on TJM, the dissipated power, the thermal mass of any heatsink present, and the ambient temperature. 100 80 60 40 20 0 TJM TJL TJF 90 25 70 90 110 Junction Temperature, TJ (°C) 130 150 170 Figure 2. Temperature monitor current reduction. 250 200 150 100 50 0 1.3 1.2 1.1 1.0 0.9 0.8 VTHTH 70 80 90 110 100 Thermal Monitor Activation Temperature, TJM (°C) 130 120 150 140 RTH pull-up to 5 V RTH pull-up to 3 V RTH pull-down to GND Figure 3. TJM versus a pull-up or pull-down resistor, RTH, and VTHTH. |
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