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EL7516IY Datasheet(PDF) 8 Page - Intersil Corporation |
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EL7516IY Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 12 page 8 FN7333.6 October 9, 2007 Applications Information The EL7516 is a high frequency, high efficiency boost regulator operated at constant frequency PWM mode. The boost converter stores energy from an input voltage source and delivers it to a higher output voltage. The input voltage range is 2.5V to 5.5V and the output voltage range is 5V to 18V. The switching frequency is selectable between 600KHz and 1.2MHz, allowing smaller inductors and faster transient response. An external compensation pin gives the user greater flexibility in setting output transient response and tighter load regulation. The converter soft-start characteristic can also be controlled by external CSS capacitor. The SHDN pin allows the user to completely shut-down the device. Boost Converter Operations Figure 28 shows a boost converter with all the key components. In steady state operating and continuous conduction mode where the inductor current is continuous, the boost converter operates in two cycles. During the first cycle, as shown in Figure 29, the internal power FET turns on and the Schottky diode is reverse biased and cuts off the current flow to the output. The output current is supplied from the output capacitor. The voltage across the inductor is VIN and the inductor current ramps up in a rate of VIN / L, L is the inductance. The inductance is magnetized and energy is stored in the inductor. The change in inductor current is: FIGURE 25. TRANSIENT RESPONSE - 1.2MHz FIGURE 26. TYPICAL SHDN INPUT LEVEL vs VIN FIGURE 27. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE FIGURE 28. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE Typical Performance Curves (Continued) VIN = 3.3V VOUT = 12V IOUT = 50mA TO 300mA 0.1ms/DIV 200mV/DIV 0 1 2 3 4 5 3 3.5 4 4.5 5 5.5 6 VIN (V) SHDN TURN OFF SHDN TURN ON JEDEC JESD51-7 HIGH EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD 1.0 0.9 0.6 0.4 0.3 0.2 0.1 0 0 255075 100 125 AMBIENT TEMPERATURE (°C) 85 870mW θ JA = 11 5°C /W M SO P8 0.8 0.5 0.7 JEDEC JESD51-3 LOW EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD 0.6 0.4 0.3 0.2 0.1 0 0 255075 100 125 AMBIENT TEMPERATURE (°C) 85 486mW θ JA = 20 6°C /W M SO P8 0.5 ΔI L1 Δt1 V IN L --------- × = Δt1 D f SW ---------- = D Duty Cycle = ΔV O I OUT C OUT ---------------- Δt 1 × = (EQ. 1) EL7516 |
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