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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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EP5348UI датащи(PDF) 8 Page - Altera Corporation |
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EP5348UI датащи(HTML) 8 Page - Altera Corporation |
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8 / 12 page  EP5348UI MOSFET which is compared to a reference current. When this level is exceeded the P- FET is turned off and the N-FET is turned on, pulling VOUT low. This condition is maintained for approximately 0.5mS and then a normal soft start is initiated. If the over current condition still persists, this cycle will repeat. Under Voltage Lockout During initial power up an under voltage lockout circuit will hold-off the switching circuitry until the input voltage reaches a sufficient level to ensure proper operation. If the voltage drops below the UVLO threshold, the lockout circuitry will disable the switching. Hysteresis is included to prevent chattering between states. Enable The ENABLE pin provides a means to shut down the converter or enable normal operation. A logic low will disable the converter and cause it to shut down. A logic high will enable the converter into normal operation. NOTE: The ENABLE pin must not be left floating. Thermal Shutdown When excessive power is dissipated in the chip, the junction temperature rises. Once the junction temperature exceeds the thermal shutdown threshold, the thermal shutdown circuit turns off the converter output voltage thus allowing the device to cool. When the junction temperature decreases by 15C°, the device will go through the normal startup process. Application Information Output Voltage Programming EP5348 10µF 0603 VOUT PVIN AGND VIN ENABLE AVIN PGND COUT VOUT RA RB VFB 2.2µF 0603 CIN CAVIN 0.1µF CA Figure 3: Typical Application Circuit The EP5348UI uses a simple resistor divider to program the output voltage. Referring to Figure 3, use 200 k Ω, 1% or better for the upper resistor (RA). The value of the bottom resistor (RB ) in kΩ is given as: nominal 6 . 0 ) ( * V VFB VFB V R VFB R OUT A B = − = A 5pF MLCC capacitor CA is also required in parallel with RA for compensation. Input Filter Capacitor CIN_MIN = 2.2µF 0603 case size or larger. The input capacitor must use a X5R or X7R or equivalent dielectric formulation. Y5V or equivalent dielectric formulations lose capacitance with frequency, bias, and with temperature, and are not suitable for switch- mode DC-DC converter input filter applications. Output Filter Capacitor COUT_MIN = 10uF 0603 + 2.2uF 0603 MLCC when 4.5V ≤ VIN ≤ 5.5V, AND IOUT > 300mA. COUT_MIN = 10uF 0603 MLCC for all other use cases. However, ripple performance can always be improved by adding a second 2.2uF or 1uF output capacitor for any operating condition. VOUT has to be sensed at the last output filter capacitor next to the EP5348UI. Any additional bulk capacitance for load decoupling and byass has to be far enough from the VOUT 8 www.altera.com/enpirion 05721 October 11, 2013 Rev D |
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