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CS5112EDWFR24 Scheda tecnica(PDF) 9 Page - Cherry Semiconductor Corporation |
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CS5112EDWFR24 Scheda tecnica(HTML) 9 Page - Cherry Semiconductor Corporation |
9 / 10 page 9 Application Notes: continued 25 0 05 VREG (V) 50 75 100 10 20 25 15 30 QJA = 35°C/W VIN = 14V Max Total Power = 1.86W 25 0 05 VREG (V) 50 75 100 10 20 25 15 30 QJA = 55°C/W VIN = 14V Max Total Power = 1.18W Linear Regulator Output Current vs. Input Voltage * Subjecting the CS5112 to these conditions will exceed the maximum total power that the part can handle, thereby forcing it into thermal limit. 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/(¹R4C2), (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 = 64.9kW 100 mF ESR<8 W 0.1 mF CCOMP 0.33 mF L=33 mH VIN COUT 88 mF (2) 100k W 946 W 7.5k W 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 = 1/2 pR4C1 +G B A C fP = 1/ p RLoadCOUT error amplifier gain fCO fz = 1/2 p ESR COUT fP = 1/ pR4C2 -20dB/dec -G modulator gain + feedback resistor divider attenuation Worst Case Switcher Worst Case Switcher Linear Power Power Available Power Available VREG VIN ILIN Dissipation ( QJA = 55¡C/W) ( QJA = 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 * * Figure 12: The shaded area shows the safe operating area of the CS5112 as a function of ILIN, VREG, and QJA. Refer to the table below for typical loads and voltages. |
Codice articolo simile - CS5112EDWFR24 |
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Descrizione simile - CS5112EDWFR24 |
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