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ILC7082AIM528X Datasheet(PDF) 6 Page - Fairchild Semiconductor |
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ILC7082AIM528X Datasheet(HTML) 6 Page - Fairchild Semiconductor |
6 / 16 page ILC7082 6 REV. 1.6.2 11/17/04 Thermal Protection The ILC7082 also includes a thermal protection circuit which shuts down the regulator when die temperature exceeds 170˚C due to overheating. In thermal shutdown, once the die temperature cools to below 160˚C, the regulator is enabled. If the die temperature is excessive due to high package power dissipation, the regulator’s thermal circuit will continue to pulse the regulator on and off. This is called thermal cycling. Excessively high die temperature may occur due to high dif- ferential voltage across the regulator or high load current or high ambient temperature or a combination of all three. Thermal protection protects the regulator from such fault conditions and is a necessary requirement in today’s designs. In normal operation, the die temperature should be limited to under 150˚C. Adjustable Output Voltage Figure 3 shows how an adjustable output voltage can be easily achieved using ILC7082-ADJ. The output voltage, VOUT is given by the following equation: VOUT = 1.24V x (R1/R2 + 1) Figure 3. Application Circuit for Adjustable Output Voltage For best results, a resistor value of 470k Ω or less may be used for R2. The output voltage can be programmed from 2.5V to 12V. Note: An external capacitor should not be connected to the adjustable feedback pin (pin 4). Connecting an exter- nal capacitor to pin 4 may cause regulator instability and lead to unwanted oscillations. Maximum Output Current The maximum output current available from the ILC7082 is limited by the maximum package power dissipation as well as the device’s internal current limit. For a given ambient temperature, TA, the maximum package power dissipation is given by: PD(MAX) = (TJ(MAX) - TA) / θJA where TJ(MAX) = 150˚C is the maximum junction tempera- ture and qJA = 333˚C/W is the package thermal resistance. For example at TA = 85˚C ambient temperature, the maxi- mum package power dissipation is; PD(MAX) = 195mW The maximum output current can be calculated from the following equation: IOUT(MAX) < PD(MAX) / (VIN - VOUT) For example at VIN = 6V, VOUT = 5V and TA = 85˚C, the maximum output current is IOUT(MAX) < 195mA. At higher output current, the die temperature will rise and cause the thermal protection circuit to be enabled. Application Hints Figure 4 shows the typical application circuit for the ILC7082. Figure 4. Basic Application Circuit for Fixed Output Voltage Versions Input Capacitor An input capacitor CIN of value 1µF or larger should be con- nected from VIN to the main ground plane. This will help to filter supply noise from entering the LDO. The input capaci- tor should be connected as close to the LDO regulator input pin as is practical. Using a high-value input capacitor will offer superior line transient response as well as better power supply ripple rejection. A ceramic or tantalum capacitor may be used at the input of the LDO regulator. ILC7083-ADJ V OUT V IN C OUT SOT23-5 C IN R1 R2 ON OFF 12 3 4 5 V ADJ ILC7082 V OUT V IN C OUT SOT23-5 C IN ON OFF 12 3 4 5 C NOISE |
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