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S-8337ACDB-P8T1G Datasheet(PDF) 14 Page - Seiko Instruments Inc |
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S-8337ACDB-P8T1G Datasheet(HTML) 14 Page - Seiko Instruments Inc |
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14 / 51 page  STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series Rev.4.0_01 14 6. Error amplifier The error amplifier outputs the PWM control signal so that the voltage of the FB pin is held at a specific value (1 V). By connecting a resistor (RZ) and capacitor (CZ) to the output pin (CC pin) of the error amplifier in series, an optional loop gain can be set, enabling stabilized phase compensation. 7. Operation The following are basic equations [(1) through (7)] of the step-up switching regulator (refer to Figure 10). D L CL M1 FB CONT VIN EXT VSS VOUT Figure 10 Step-up Switching Regulator Circuit for Basic Equations Voltage at the CONT pin at the moment M1 is turned ON (current IL flowing through L is zero), VA: VA = VS*1……………………………………………………………………………………………….…(1) *1. VS: Non-saturated voltage of M1 Change in IL over time: L V V L V dt dl S IN L L − = = …………………………………………………………………………………..…(2) Integration of the above equation: t L V V I S IN L • − = …………………………………………………………………….…………….……(3) IL flows while M1 is ON (ton). This time is determined by the oscillation frequency of OSC. Peak current (IPK) after tON: ON S IN PK t L V V I • − = ……………………………………………………………………………………(4) The energy stored in L is represented by • L(IPK)2. When M1 is turned OFF (tOFF), the energy stored in L is released via a diode, generating a reverse voltage (VL). VL: () IN D OUT L V V V V − + = *2 ……….………………………………………………………..………………(5) *2. VD: Diode forward voltage The voltage on the CONT pin rises only by VOUT + VD. 1 2 |
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