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EL7516IYZ-T13 Datasheet(PDF) 10 Page - International Rectifier |
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EL7516IYZ-T13 Datasheet(HTML) 10 Page - International Rectifier |
10 / 11 page 10 FN7333.3 For noise sensitive application, a 0.1µF placed in parallel with the larger output capacitor is recommended to reduce the switching noise coupled from the LX switching node. Schottky Diode In selecting the Schottky diode, the reverse break down voltage, forward current and forward voltage drop must be considered for optimum converter performance. The diode must be rated to handle 1.5A, the current limit of the EL7516. The breakdown voltage must exceed the maximum output voltage. Low forward voltage drop, low leakage current, and fast reverse recovery will help the converter to achieve the maximum efficiency. Input Capacitor The value of the input capacitor depends the input and output voltages, the maximum output current, the inductor value and the noise allowed to put back on the input line. For most applications, a minimum 10µF is required. For applications that run close to the maximum output current limit, input capacitor in the range of 22µF to 47µF is recommended. The EL7516 is powered from the VIN. To. High frequency 0.1µF by-pass cap is recommended to be close to the VIN pin to reduce supply line noise and ensure stable operation. Loop Compensation The EL7516 incorporates an transconductance amplifier in its feedback path to allow the user some adjustment on the transient response and better regulation. The EL7516 uses current mode control architecture which has a fast current sense loop and a slow voltage feedback loop. The fast current feedback loop does not require any compensation. The slow voltage loop must be compensated for stable operation. The compensation network is a series RC network from COMP pin to ground. The resistor sets the high frequency integrator gain for fast transient response and the capacitor sets the integrator zero to ensure loop stability. For most applications, the compensation resistor in the range of 2K to 7.5K and the compensation capacitor in the range of 3nF to 10nF. Soft-Start The soft-start is provided by an internal 6µA current source charges the external CSS, the peak MOSFET current is limited by the voltage on the capacitor. This in turn controls the rising rate of the output voltage. The regulator goes through the start-up sequence as well after the SHDN pin is pulled to HI. Frequency Selection The EL7516 switching frequency can be user selected to operate at either at constant 620kHz or 1.25MHz. Connecting FSEL pin to ground sets the PWM switching frequency to 620kHz. When connect FSEL high or VDD, switching frequency is set to 1.25MHz. Shut-Down Control When shut-down in is pulled low, the EL7516 is shut-down reducing the supply current to <3µA. Maximum Output Current The MOSFET current limit is nominally 1.5A and guaranteed 1.3A. This restricts the maximum output current IOMAX based on the following formula: where: IL = MOSFET current limit IL-AVG = average inductor current ∆IL = inductor ripple current VDIODE = Schottky diode forward voltage, typically, 0.6V FS = switching frequency, 600KHz or 1.2MHz D = MOSFET turn-on ratio: The following table gives typical maximum Iout values for 1.2MHz switching frequency and 22µH inductor: Thermal Performance The EL7516 uses a fused-lead package, which has a reduced θJA of 100°C/W on a four-layer board and 115°C/W on a two-layer board. Maximizing copper around the ground pins will improve the thermal performance. This device also has internal thermal shut-down set at around 130°C to protect the component. TABLE 1. VIN (V) VOUT (V) IOMAX (mA) 2.5 5 570 2.5 9 325 2.5 12 250 3.3 5 750 3.3 9 435 3.3 12 330 5 9 650 5 12 490 IL IL-AVG 12 ⁄∆I L × () + = ∆I L VIN VO VDIODE + () V IN – [] × LVO ( VDIODE) FS × + × ------------------------------------------------------------------------------ = IL-AVG IOUT 1D – ------------- = D1 VIN VOUT VDIODE + -------------------------------------------- – = EL7516 |
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