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L6713ATR Datasheet(PDF) 50 Page - STMicroelectronics |
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L6713ATR Datasheet(HTML) 50 Page - STMicroelectronics |
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50 / 64 page  Oscillator L6713A 50/64 19 Oscillator L6713A embeds two/three phase oscillator with optimized phase-shift (180º/120º phase- shift) in order to reduce the input rms current and optimize the output filter definition. The internal oscillator generates the triangular waveform for the PWM charging and discharging with a constant current an internal capacitor. The switching frequency for each channel, FSW, is internally fixed at 200 kHz so that the resulting switching frequency at the load side results in being multiplied by N (number of phases). The current delivered to the oscillator is typically 25 μA (corresponding to the free running frequency FSW = 200 kHz) and it may be varied using an external resistor (ROSC) connected between the OSC pin and SGND or VCC (or a fixed voltage greater than 1.24 V). Since the OSC pin is fixed at 1.24 V, the frequency is varied proportionally to the current sunk (forced) from (into) the pin considering the internal gain of 6 KHz/ μA. In particular connecting ROSC to SGND the frequency is increased (current is sunk from the pin), while connecting ROSC to VCC = 12 V the frequency is reduced (current is forced into the pin), according the following relationships: ROSC vs. SGND ROSC vs. +12V Maximum programmable switching frequency per phase must be limited to 1 MHz to avoid minimum Ton limitation. Anyway, device power dissipation must be checked prior to design high switching frequency systems. Figure 24. ROSC vs. switching frequency F SW 200 kHz () 1.240V R OSC kΩ () ---------------------------- 6 kHz μA ----------- ⋅ + 200 kHz () 7.422 10 3 ⋅ R OSC kΩ () ----------------------------- R OSC kΩ () ⇒ + == = 6 kHz μA ----------- 200 kHz () 7.422 10 3 ⋅ R OSC kΩ () ----------------------------- R OSC kΩ () ⇒ + 7.422 10 3 ⋅ F SW kHz () 200 kHz () – ------------------------------------------------------------ == k Ω [] F SW 200 kHz () 12V 1.240V – R OSC kΩ () ------------------------------------ 8kHz μA -------------- ⋅ – 200 kHz () 8.608 10 4 ⋅ R OSC kΩ () ----------------------------- – R OSC kΩ () ⇒ 2 -- == = kHz μA ----------- 200 kHz () 6.456 10 4 ⋅ R OSC kΩ () ----------------------------- – R OSC kΩ () ⇒ 8.608 10 4 ⋅ 200 kHz () F SW kHz () – ------------------------------------------------------------ == k Ω [] 0 1000 2000 3000 4000 5000 6000 7000 25 50 75 100 125 150 175 200 Fsw [kHz] Programmed 0 50 100 150 200 250 300 350 400 150 250 350 450 550 650 750 850 950 1050 Fsw [kHz] Programmed |
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