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S-8338AACB-P8T1G Datasheet(PDF) 20 Page - Seiko Instruments Inc |
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S-8338AACB-P8T1G Datasheet(HTML) 20 Page - Seiko Instruments Inc |
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20 / 51 page  STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series Rev.4.0_01 20 5. Oscillation frequency and maximum duty ratio setting resistors (ROSC, RDuty) With the S-8337/8338 Series, the oscillation frequency can be set in a range of 286 kHz to 1.133 MHz using external resistance. Connect a resistor across the ROSC and VSS pins. Select the resistor by using the following equation and referring to Figure 12. However, the following equation and figure assume that the resistance value is the desired value and show the theoretical values when the IC is in the typical conditions. Note that fluctuations of resistance and IC are not considered. 140 • 10 3 ROSC [k Ω] ≅ fOSC [kHz] 1400 1200 1000 800 600 400 200 0 0 200 400 600 ROSC [k Ω] Figure 12 ROSC vs. fOSC With the S-8337 Series, the maximum duty ratio can be set in a range of 47% to 88.5% by an external resistor. Connect the resistor across the RDuty and VSS pins. Select the resistance by using the following equation and referring to Figure 13. The maximum duty ratio fluctuates according to the oscillation frequency. If the value of ROSC is changed, therefore, be sure to change the value of RDuty so that it is always in proportion to ROSC. However, the following equation and figure assume that the resistance value is the desired value and show the theoretical values when the IC is in the typical conditions. Note that fluctuations of resistance and IC are not considered. (94.5 − MaxDuty) ≅ ROSC RDuty 11.5 100 90 80 70 60 50 40 0 2 4 5 RDuty/ROSC 13 Figure 13 RDuty/ROSC vs. MaxDuty Connect resistors ROSC and RDuty as close to the IC as possible. |
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