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## S-8337ACDB-P8T1G Datasheet(PDF) 21 Page - Seiko Instruments Inc

 Part # S-8337ACDB-P8T1G Description SWITCHING REGULATOR CONTROLLER Download 51 Pages Scroll/Zoom 100% Manufacturer SII [Seiko Instruments Inc] Direct Link http://www.sii.co.jp Logo

## S-8337ACDB-P8T1G Datasheet(HTML) 21 Page - Seiko Instruments Inc

 21 / 51 pageSTEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLERRev.4.0_01S-8337/8338 Series216. Short-circuit protection delay time setting capacitor (CSP)With the S-8337/8338 Series, the short-circuit protection delay time can be set to any value by anexternal capacitor. Connect the capacitor across the CSP and VSS pins. Select the capacitance byusing the following equation and referring to Figure 14. However, the following equation and figureassume that the capacitor value is the desired value and show the theoretical values when the IC is inthe typical conditions. Note that fluctuations of capacitor and IC are not considered.CSP [μF]1.0tPRO [ms] • 2 • 10−3≅12010080604020000.100.200.25CSP [μF]0.050.15Figure 14 CSP vs. tPRO7. Output voltage setting resistors (RFB1, RBF2)With the S-8337/8338 Series, the output voltage can be set to any value by external divider resistors.Connect the divider resistors across the VOUT and VSS pins. Because VFB= 1 V, the output voltagecan be calculated by this equation.=VOUTRFB2(RFB1+ RFB2)Connect divider resistors RFB1 and RFB2 as close to the IC to minimize effects from of noise. If noisedoes have an effect, adjust the values of RFB1 and RFB2 so that RFB1+ RFB2 < 100 kΩ.CFB connected in parallel with RFB1 is a capacitor for phase compensation. Select the optimumvalue of this capacitor at which the stable operation can be ensured from the values of the inductorand output capacitor.8. Phase compensation setting resistor and capacitor (RZ, CZ)The S-8337/8338 Series needs appropriate compensation for the voltage feedback loop to preventexcessive output ripple and unstable operation from deteriorating the efficiency. This compensation isimplemented by connecting RZ and CZ in series across the CC and VSS pins. RZ sets thehigh-frequency gain for a high-speed transient response. CZ sets the pole and zero of the erroramplifier and keeps the loop stable. Adjust RZ and CZ, taking into consideration conditions such asthe inductor, output capacitor, and load current, so that the optimum transient characteristics can beobtained.

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