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ADP1711AUJZ-1.15R7 Arkusz danych(PDF) 10 Page - Analog Devices |
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ADP1711AUJZ-1.15R7 Arkusz danych(HTML) 10 Page - Analog Devices |
10 / 16 page ADP1710/ADP1711 Rev. 0 | Page 10 of 16 APPLICATION INFORMATION CAPACITOR SELECTION Output Capacitor The ADP1710/ADP1711 are designed for operation with small, space-saving ceramic capacitors, but they will function with most commonly used capacitors as long as care is taken about the effective series resistance (ESR) value. The ESR of the output capacitor affects stability of the LDO control loop. A minimum of 1 μF capacitance with an ESR of 500 mΩ or less is recommended to ensure stability of the ADP1710/ADP1711. Transient response to changes in load current is also affected by output capacitance. Using a larger value of output capacitance improves the transient response of the ADP1710/ADP1711 to large changes in load current. Figure 21 and Figure 22 show the transient responses for output capacitance values of 1 μF and 22 μF, respectively. VIN = 5V VOUT = 3.3V CIN = 1µF COUT = 1µF TIME (4µs/DIV) 1 VOUT RESPONSE TO LOAD STEP FROM 7.5mA TO 142.5mA Figure 21. Output Transient Response, COUT = 1 μF VIN = 5V VOUT = 3.3V CIN = 22µF COUT = 22µF TIME (4µs/DIV) 1 VOUT RESPONSE TO LOAD STEP FROM 7.5mA TO 142.5mA Figure 22. Output Transient Response, COUT = 22 μF Input Bypass Capacitor Connecting a 1 μF capacitor from IN to GND reduces the circuit sensitivity to printed circuit board (PCB) layout, especially when long input traces or high source impedance are encountered. If greater than 1 μF of output capacitance is required, the input capacitor should be increased to match it. Input and Output Capacitor Properties Any good quality ceramic capacitors can be used with the ADP1710/ADP1711, as long as they meet the minimum capacitance and maximum ESR requirements. Ceramic capacitors are manufactured with a variety of dielectrics, each with different behavior over temperature and applied voltage. Capacitors must have a dielectric adequate to ensure the minimum capacitance over the necessary temperature range and dc bias conditions. X5R or X7R dielectrics with a voltage rating of 6.3 V or 10 V are recommended. Y5V and Z5U dielectrics are not recommended, due to their poor temperature and dc bias characteristics. CURRENT LIMIT AND THERMAL OVERLOAD PROTECTION The ADP1710/ADP1711 are protected against damage due to excessive power dissipation by current and thermal overload protection circuits. The ADP1710/ADP1711 are designed to current limit when the output load reaches 270 mA (typical). When the output load exceeds 270 mA, the output voltage is reduced to maintain a constant current limit. Thermal overload protection is included, which limits the junction temperature to a maximum of 150°C (typical). Under extreme conditions (that is, high ambient temperature and power dissipation) when the junction temperature starts to rise above 150°C, the output is turned off, reducing the output current to zero. When the junction temperature drops below 135°C, the output is turned on again and output current is restored to its nominal value. Consider the case where a hard short from OUT to ground occurs. At first the ADP1710/ADP1711 current limits, so that only 270 mA is conducted into the short. If self heating of the junction is great enough to cause its temperature to rise above 150°C, thermal shutdown activates, turning off the output and reducing the output current to zero. As the junction temperature cools and drops below 135°C, the output turns on and conducts 270 mA into the short, again causing the junction temperature to rise above 150°C. This thermal oscillation between 135°C and 150°C causes a current oscillation between 270 mA and 0 mA, which continues as long as the short remains at the output. |
Podobny numer części - ADP1711AUJZ-1.15R7 |
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Podobny opis - ADP1711AUJZ-1.15R7 |
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