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EL7515IYZ-T13 Datasheet(PDF) 6 Page - Intersil Corporation |
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EL7515IYZ-T13 Datasheet(HTML) 6 Page - Intersil Corporation |
6 / 9 page 6 FN7120.2 August 10, 2007 Applications Information The EL7515 is a step-up regulator, operated at fixed frequency pulse-width-modulation (PWM) control. The input voltage is 1.8V to 13.2V and output voltage is 4.5V to 17V. The switching frequency (up to 1.2MHz) is decided by the resistor connected to RT pin. Start-Up After VDD reaches a threshold of about 1.7V, the start-up oscillator generates fixed duty-ratio of 0.5 to 0.7 at a frequency of several hundred kilohertz. This will boost the output voltage. When VDD reaches about 3.7V, the PWM comparator takes over the control. The duty ratio will be decided by the multiple-input direct summing comparator, Max_Duty signal (about 90% duty-ratio), and the Current Limit Comparator, whichever is the smallest. The soft-start is provided by the current limit comparator. As the internal 12µA 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 EN signal is pulled to HI. Steady-State Operation When the output reaches the preset voltage, the regulator operates at steady state. Depending on the input/output conditions and component values, the inductor operates at either continuous-conduction mode or discontinuous-conduction mode. In the continuous-conduction mode, the inductor current is a triangular waveform and LX voltage a pulse waveform. In the discontinuous-conduction mode, the inductor current is completely dried out before the MOSFET is turned on again. The input voltage source, the inductor, and the MOSFET and output diode parasitic capacitors form a resonant circuit. Oscillation will occur in this period. This oscillation is normal and will not affect the regulation. FIGURE 7. STEADY STATE OPERATION (INDUCTOR DISCONTINUOUS CONDUCTION) FIGURE 8. STEADY STATE OPERATION (INDUCTOR CONTINUOUS CONDUCTION) FIGURE 9. POWER-UP FIGURE 10. LOAD TRANSIENT RESPONSE Typical Performance Curves (Continued) VIN = 5V, VO = 12V, IO = 30mA ΔV IN VLX ΔV O IL 50mV/DIV 10V/DIV 20mV/DIV 0.5A/DIV 0.5µs/DIV VIN = 5V, VO = 12V, IO = 300mA ΔVIN VLX ΔVO IL 50mV/DIV 10V/DIV 20mV/DIV 0.5A/DIV 0.5µs/DIV VIN = 5V, VO = 12V, IO = 300mA ΔVIN VO IL 2V/DIV 5V/DIV 0.5A/DIV 0.5ms/DIV VIN = 5V, VO = 12V, IO = 50mA TO 300mA IO ΔVO 100mA/DIV 0.5V/DIV 0.2ms/DIV EL7515 |
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