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SC1104XEVB Datasheet(PDF) 8 Page - Semtech Corporation |
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SC1104XEVB Datasheet(HTML) 8 Page - Semtech Corporation |
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8 / 14 page  8 © 2006 Semtech Corp. www.semtech.com POWER MANAGEMENT SC1104A/B ∏ • • • = Cn Ra 2 1 f NET Value for the resistor R N should be 1/10 of the output divider upper resistor R A. Example. Switching frequency f SW = 300kHz Output capacitance C OUT = 3 x 330µF Output capacitor ESR = 45m Ω/each Output inductance L OUT = 4.7µH Input voltage V IN = 12V Output voltage V OUT = 3.3V Let’s choose crossover frequency f CO = 1/20 • fSW = 15kHz The compensation values used in this example are based on the following criteria: f Z = fLC; fNET = 1/10 • fLC; fP = 10 • fCO = 150kHz Therefore, kHz 33 . 2 F 990 H 4.7µ 2 1 f LC = ∏ µ • • • = kHz 72 . 10 F 990 015 . 0 2 1 f ESR = ∏ µ • • • = Since, the EA can sink/source about 1mA, let’s choose Rc = 680 Ω, then F 1 . 0 Rc Fz 2 1 C C µ = ∏ • • • = pF 1500 Rc Fp 2 1 C P = ∏ • • • = Assuming the output divider lower resistor R B = 1k, then for V OUT = 3.3V the RA = 2.32k. F 3 . 0 Ra f 2 1 C NET N µ = ∏ • • • = At the closed-loop crossover frequency f CO, the Theory of Operation (Cont.) attenuation due to the L O, CO filter and the output resistor divider R A, RB is compensated by the gain of the PWM modulator and the gain of the transconductance error amplifier (Gm EA • Z COMP). Shown below is a typical Bode plot of the open-loop frequency response of SC1104 based buck converter. 1 10 100 1k 10k 100k 1Meg frequency in hertz -450 -350 -250 -150 -50.0 -80.0 -40.0 0 40.0 80.0 1 2 1 vdberr 2 vpherr |
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