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SI-3011ZF 데이터시트(PDF) 5 Page - Allegro MicroSystems |
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SI-3011ZF 데이터시트(HTML) 5 Page - Allegro MicroSystems |
5 / 8 page SI-3011ZF High-Current, Low-Dropout, 1.1~5 V Regulator www.allegromicro.com Linear Regulators 5 APPLICATIONS INFORMATION Input Capacitor (C I, approximately 10 µF). This is necessary either when the input line includes inductance or when the wiring is long. Output Capacitor (C O, > 47 µF). This device is not designed for a use with a very low ESR output capacitor such as a ceramic capacitor. Output oscillation may occur with that kind of capacitor. Output Voltage Adjustable Resistors (R1 and R2). The output voltage is adjusted by R1 and R2. 10 k Ω or 11 k Ω for R2 is recommended. R1 = (V O – Vref)/(Vref/R2) For an output voltage of 1.8 V or less, add a 10 k Ω resistor between ADJ and the junction of R1 and R2. Determination of DC Input Voltage. The minimum input voltage V I(min) should be higher than the sum of the fixed output voltage and the maximum rated dropout voltage. If setting the output voltage lower than 2.0 V, the minimum input voltage should be more than 2.4 V. Overcurrent Protection. The SI-3000ZD series has a built-in fold-back type overcurrent protection circuit, which limits the output current at a start-up mode. It thus cannot be used in applications that require current at the start-up mode such as: (1) constant-current load, (2) power supply with positive and negative outputs to common load (a center-tap type power supply), or (3) raising the output voltage by putting a diode or a resistor between the device ground and system ground. Thermal Protection. Circuitry turns off the pass transistor when the junction temperature rises above 135°C. It is intended only to protect the device from failures due to excessive junction temperatures and should not imply that output short circuits or continuous overloads are permitted. Heat Radiation and Reliability. The reliability of the IC is directly related to the junction temperature (T J) in its operation. Accordingly, careful consideration should be given to heat dissipation. The graph on page 2 illustrates the effect of thermal resistance on the allowable package power dissipation. When mounting to a heat sink, apply silicone grease (Shin- Etsu Chemical G746, Dow Corning Toray Silicone SC102, or Toshiba Silicone SY6260). Recommended mounting hardware torque: 0.588 ~ 0.686 Nm or 6.0 ~ 7.0 kgf•cm (4.34 ~ 5.06 lbf•ft). The junction temperature (T J) can be determined from either of the following equations: T J = (PD × R θJA) + TA or T J = (PD × R θJC) + TC where P D = IO × (VI – VO) and RθJC = 5°C/W. Parallel Operation. Parallel operation to increase load current is not permitted. |
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