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S-8363B-I6T1U2 Datasheet(PDF) 15 Page - Seiko Instruments Inc |
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S-8363B-I6T1U2 Datasheet(HTML) 15 Page - Seiko Instruments Inc |
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15 / 50 page  STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR Rev.2.0_01 S-8363 Series 15 Operation Principles The S-8363 Series is a step-up switching regulator. Figure 14 shows the basic circuit diagram. Step-up switching regulators start current supply by the input voltage (VIN) when the Nch power MOS FET is turned on and holds energy in the inductor at the same time. When the Nch power MOS FET is turned off, the CONT pin voltage is stepped up to discharge the energy held in the inductor and the current is discharged to VOUT through the diode. When the discharged current is stored in COUT, a voltage is generated, and the potential of VOUT increases until the voltage of the FB pin reaches the same potential as the internal reference voltage. For the PWM control method, the switching frequency (fOSC) is fixed and the VOUT voltage is held constant according to the ratio of the ON time and OFF time (ON duty) of the Nch power MOS FET in each period. In the PWM control method, the VOUT voltage is held constant by controlling the ON time. In the PFM control method, the Nch power MOS FET is turned on by fixed duty. When energy is discharged to VOUT once and the VOUT potential exceeds the set value, the Nch power MOS FET stays in the off status until VOUT decreases to the set value or less due to the load discharge. Time VOUT decreases to the set value or less depends on the amount of load current, so, the switching frequency varies depending on this current. VSS FB CONT COUT RL VOUT SD IOUT I2 VIN L I1 Nch power MOS FET Figure 14 Basic Circuit of Step-up Switching Regulator The ON duty in the current continuous mode can be calculated by using the equation below. Use the S-8363 Series in the range where the ON duty is less than the maximum duty. The maximum duty is 88% (typ.). ON duty = () 1 − VIN VOUT + VD*1 × 100 [%] *1. VD : Forward voltage of diode |
Similar Part No. - S-8363B-I6T1U2 |
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Similar Description - S-8363B-I6T1U2 |
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