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RT9202B Datasheet(PDF) 11 Page - Richtek Technology Corporation |
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RT9202B Datasheet(HTML) 11 Page - Richtek Technology Corporation |
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11 / 14 page  RT9202B 11 DS9202B-03 March 2007 www.richtek.com VOUT 3.3V 2.5V 1.5V Inductor 2 µH 5 µH 2 µH 5 µH 2 µH 5 µH 1000 µF (ESR=53mΩ) 100mV 40mV 110mV 44mV 93mV 37mV 1500 µF (ESR=33mΩ) 62mV 25mV 68mV 28mV 58mV 23mV 3000 µF (ESR=21mΩ) 40mV 16mV 43mV 18mV 37mV 15mV Table 1 *Refer to Sanyo low ESR series (CE, DX, PX.....) The suggested L and C are as follows: 2 µH with ≥ 1500µF COUT 5 µH with ≥ 1000µF COUT Figure 5 Input / Output Capacitor High frequency/long life decoupling capacitors should be placed as close to the power pins of the load as physically possible. Be careful not to add inductance to the PCB trace, as it could eliminate the performance from utilizing these low inductance components. Consult with the manuf acturer of the load on specific decoupling requirements. The output capacitors are necessary for filtering output and stabilizing the close loop (see the PWM loop stability). For powering advanced, high-speed processors, it is required to meet with the requirement of fast load transient, high frequency capacitors with low ESR/ESL capacitors are recommended. Another concern is high ESR induced ripple may trigger UV or OV protections. PWM Loop Stability The RT9202B is a voltage mode buck controller designed for 5V step-down applications. The gain of error amplifier is fixed at 35dB for simplified design. The output amplitude of ramp oscillator is 1.75V, the loop gain and loop pole/zero are calculated as follows : DC loop gain GA = LC filter pole PO = Error Amp pole PA = 300kHz ESR zero ZO = The RT9202B Bode plot as shown Figure 6 is stable in most of application conditions. V I V O R C D L Q C.C.M T ON T OFF T S V L V I - V O - V O uQ mI L I L = I O i L i Q I Q I D i D V L OUT V 0.8 1.75 5 35dB × × LC 2 1 π ESRC 2 1 π |
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Similar Description - RT9202B |
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