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CAT660ELA Datasheet(PDF) 8 Page - ON Semiconductor |
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CAT660ELA Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 15 page CAT660 http://onsemi.com 8 Capacitor Selection Low ESR capacitors are necessary to minimize voltage losses, especially at high load currents. The exact values of C1 and C2 are not critical but low ESR capacitors are necessary. The ESR of capacitor C1, the pump capacitor, can have a pronounced effect on the output. C1 currents are approximately twice the output current and losses occur on both the charge and discharge cycle. The ESR effects are thus multiplied by four. A 0.5 Ω ESR for C1 will have the same effect as a 2 Ω increase in CAT660 output impedance. Output voltage ripple is determined by the value of C2 and the load current. C2 is charged and discharged at a current roughly equal to the load current. The internal switching frequency is one−half the oscillator frequency. VRIPPLE + IOUT (FOSC C2) ) IOUT ESRC2 For example, with a 10 kHz oscillator frequency (5 kHz switching frequency), a 150 mF C2 capacitor with an ESR of 0.2 Ω and a 100 mA load peak−to−peak ripple voltage is 87 mV. Table 5. VRIPPLE vs. FOSC VRIPPLE (mV) IOUT (mA) FOSC (kHz) C2 (mF) C2 ESR (W) 87 100 10 150 0.2 28 100 80 150 0.2 Figure 16. Oscillator Figure 17. External Clocking + C2 REQUIRED FOR TTL LOGIC CAT660 100 k OSC NC + C1 BOOST/FC V+ OSC LV OUT BOOST/FC (1) OSC (7) ~18 pF I 7.0 I I 7.0 I V+ LV (6) INPUT V+ −V+ CAP+ GND CAP− 1 2 3 4 8 7 6 5 |
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