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PAM2800 Datasheet(PDF) 5 Page - Power Analog Micoelectronics |
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PAM2800 Datasheet(HTML) 5 Page - Power Analog Micoelectronics |
5 / 7 page Application Information 5 In the typical application (see Figure 1), the LED current will come to constant current level little by little after the device is powered. A 62ΚΩ resistor is recommended for R1, the value for R2 should be adjusted around 33ΚΩ due to LED forward voltage from lot-to-lot or brand- to-brand. P = (T -T )/θ θ θ variation Thermal protection limits power dissipation in the PAM2800. When the operation j unction temperature exceeds 150°C, the OTP (Over Te mperature P rotection) starts the t hermal shutdown and turns the pass transistor off. The pass transistor resumes operation after the junction temperature drops below 120°C. For c ontinuous operation, the j unction temperature should be maintained below 125°C. The power dissipation is defined as: P = (V -V )*I +V *I The maximum power dissipation depends on the thermal resistance of IC package, PCB layout, the rate of surrounding airflow and temperature difference between junction and ambient. The maximum power dissipation can be calculated by the following formula: Where T is the maximum operation junction temperature 125°C.T i s t he ambient temperature, and is the thermal resistance from the junction to the ambient. For example, as is 250°C/W for SOT-23, based on the standard JEDEC 51-3 for a single- layer thermal test board, the maximum power dissipation at T =25°C can be calculated by following formula: P = (125°C-25°C)/250=0.4W To calculate the junction temperature of the PAM2800 SOT-23 package, if we use input voltage V =4V at an output current I =300mA and the case temperature T =40°C measured by the thermal couple while operating, the power dissipation is defined as: P =(4V-2.8V)*300mA+4V*70μA 360mW Power Dissipation and Thermal Consideration D IN OUT O IN GND J(MAX) A JA A D(MAX) IN O A D D(MAX) J(MAX) A JA JA ≈ and for SOT-23 package PAM2800 High Power White LED Driver 09/2008 Rev 1.1 , Power Analog Microelectronics Inc www.poweranalog.com |
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