전자부품 데이터시트 검색엔진 |
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CS5111YDWFR24 데이터시트(PDF) 9 Page - Cherry Semiconductor Corporation |
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CS5111YDWFR24 데이터시트(HTML) 9 Page - Cherry Semiconductor Corporation |
9 / 10 page Figure 10. Bode plot of error amplifier (OTA) gain and modulator gain added to the feedback resistor divider attenuation. A pole at point C: fp = 1/(πR4C2), (8g) offsets the zero set by the ESR of the output capacitors. An alternative scheme uses a single capacitor as shown in Figure 11, to roll the gain off at a relatively low frequency. Figure 11. A typical application diagram with external components con- figured in a boost topology. Step 9 Finally the watchdog timer period and Power on Reset time is determined by: tDelay = 1.353 × CDelayRBIAS. (9) VIN NC NC VSW Gnd Gnd Gnd Gnd VFB1 VFB2 SELECT COMP VREG VLIN IBIAS Gnd Gnd Gnd Gnd CDelay WDI COSC RBIAS = 64.9kΩ 100µF ESR<8Ω 0.1µF CCOMP 0.33µF L=33µH VIN COUT 88µF (2) 100kΩ 946Ω 7.5kΩ R1 R2 R3 Cdelay 390pF COSC RESET ENABLE (1) VOUT = 18V, Select > 2V VOUT = 16V, Select < 0.8V MICROPROCESSOR 5V Pole due to error amplifier output impedance and C1 G 0 fz = 1/2πR4C1 +G B A C fP = 1/π RLoadCOUT error amplifier gain fCO fz = 1/2π ESR COUT fP = 1/πR4C2 -20dB/dec -G modulator gain + feedback resistor divider attenuation 9 Application Notes: continued 25 0 05 VREG (V) 50 75 100 10 20 25 15 30 ΘJA = 35°C/W VIN = 14V Max Total Power = 1.86W 25 0 05 VREG (V) 50 75 100 10 20 25 15 30 ΘJA = 55°C/W VIN = 14V Max Total Power = 1.18W Worst Case Switcher Worst Case Switcher Linear Power Power Available Power Available VREG VIN ILIN Dissipation (ΘJA = 55°C/W) (ΘJA = 35°C/W) (V) (V) (mA) (W) (W) (W) 20 14 25 0.44 0.74 1.42 20 14 50 0.83 0.35 1.03 20 14 75 1.22 * 0.64 20 14 100 1.60 * 0.26 25 14 25 0.60 0.58 1.26 25 14 50 1.11 0.07 0.75 25 14 75 1.62 * 0.24 25 14 100 2.14 * * Linear Regulator Output Current vs. Input Voltage Figure 12: The shaded area shows the safe operating area of the CS5111 as a function of ILIN, VREG, and ΘJA. Refer to the table below for typical loads and voltages. * Subjecting the CS5111 to these conditions will exceed the maximum total power that the part can handle, thereby forcing it into thermal limit. |
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