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CS51024A Arkusz danych(PDF) 9 Page - ON Semiconductor |
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CS51024A Arkusz danych(HTML) 9 Page - ON Semiconductor |
9 / 11 page CS51021A, CS51022A, CS51023A, CS51024A http://onsemi.com 9 Synchronization A bi−directional synchronization is provided to synchronize several controllers. When SYNC pins are connected together, the converters will lock to the highest switching frequency. The fastest controller becomes the master, producing a 4.3 V, 200 ns pulse train. Only one, the highest frequency SYNC signal, will appear on the SYNC line. Sleep The sleep input is an active high input. The CS51022A/4A is placed in sleep mode when SLEEP is driven high. In sleep mode, the controller and MOSFET are turned off. Connect to GND for normal operation. The sleep mode operates at VCC ≤ 15 V. Oscillator and Duty Cycle Limit The switching frequency is set by RT and CT connected to the RTCT pin. CT charges and discharges between 3.0 V and 1.5 V. The maximum duty cycle is set by the ratio of the on time, tON, and the whole period, T = tON + tOFF. Because the timing capacitor’s discharge current is trimmed, the maximum duty cycle is well defined. It is determined by the ratio between the timing resistor RT and the timing capacitor CT. Refer to figures 6 and 7 to select appropriate values for RT and CT. fSW + 1 TSW ;TSW + tCH ) tDIS 5 2500 RT (kW) 2000 1500 1000 500 0 100 90 80 70 60 50 40 10 15 20 25 30 35 40 45 50 5 10 15 20 25 30 35 40 45 50 55 RT (kW) 1 2 3 4 5 6 8 7 2 1 3 4 8 7 5 6 1. CT = 47 pF 2. CT = 100 pF 3. CT = 150 pF 4. CT = 220 pF 5. CT = 390 pF 6. CT = 470 pF 7. CT = 560 pF 8. CT = 680 pF 1. CT = 47 pF 2. CT = 100 pF 3. CT = 150 pF 4. CT = 220 pF 5. CT = 390 pF 6. CT = 470 pF 7. CT = 560 pF 8. CT = 680 pF Figure 6. Frequency vs. RT for Discrete Capacitor Values Figure 7. Duty Cycle vs. RT for Discrete Capacitor Values ORDERING INFORMATION Device Package Shipping† CS51021AED16 SOIC−16 48 Units / Rail CS51021AEDR16 2500 Tape & Reel CS51021AEDR16G SOIC−16 (Pb−Free) CS51022ADBG TSSOP−16* 48 Units / Rail CS51022ADBR2G TSSOP−16* 2500 Tape & Reel CS51022AED16 SOIC−16 48 Units / Rail CS51022AEDR16 2500 Tape & Reel CS51022AEDR16G SOIC−16 (Pb−Free) CS51023AED16 SOIC−16 48 Units / Rail CS51023AEDR16 2500 Tape & Reel CS51023AEDR16G SOIC−16 (Pb−Free) †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. *This package is inherently Pb−Free. |
Podobny numer części - CS51024A |
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Podobny opis - CS51024A |
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