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S-8351A25MC-J2KT2U Datasheet(PDF) 18 Page - Seiko Instruments Inc |
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S-8351A25MC-J2KT2U Datasheet(HTML) 18 Page - Seiko Instruments Inc |
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18 / 51 page  STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER S-8351/8352 Series Rev.3.0_01 18 3. Operation The following are the basic equations [(1) through (7)] of the step-up switching regulator. (Refer to Figure 18.) + − + − OSC CL CONT M1 VIN L Di OFF / ON VOUT Figure 18 Step-Up Switching Regulator Circuit for Basic Equation Voltage at CONT pin at the moment M1 is turned ON (VA) *1 : VA = VS *2 (1) *1. Current flowing through L (IL) is zero. *2. Non-saturated voltage of M1. The change in IL over time : L V V L V dt dI S IN L L − = = (2) Integration of equation (2) (IL) : t L V V I S IN L • − = (3) IL flows while M1 is ON (tON). The time of tON is determined by the oscillation frequency of OSC. The peak current (IPK) after tON : ON S IN PK t L V V I • − = (4) The energy stored in L is represented by 1/2 • L (IPK)2. When M1 is turned OFF (tOFF), the energy stored in L is emitted through a diode to the output capacitor. Then, the reverse voltage (VL) is generated : VL = (VOUT + VD*1) − VIN (5) *1. Diode forward voltage The voltage at CONT pin rises only by VOUT +VD. The change in the current (IL) flowing through the diode into VOUT during tOFF : L V V V L V dt dI IN D OUT L L − + = = (6) |
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