поискавой системы для электроныых деталей |
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TC25C25 датащи(PDF) 5 Page - TelCom Semiconductor, Inc |
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TC25C25 датащи(HTML) 5 Page - TelCom Semiconductor, Inc |
5 / 7 page 4-115 TELCOM SEMICONDUCTOR, INC. 7 6 5 4 3 1 2 8 BICMOS PWM CONTROLLERS TC25C25 TC35C25 OSCILLATOR SYNCHRONIZATION WITH SEPARATE RC TIMER Synchronization can also be done by having a separate RC timing circuit on the slave oscillator that is slightly lower frequency than the master oscillator. The sync input will not be in a high impedance state so the number of slave oscillators is limited. This method of synchronization is useful when slave oscillator is located in a different location. When a separate RC timer is used in the slave controller, ground loop noise pickup in the oscillator is minimized. OUTPUT SECTION The output stage of the TC35C25 is comprised of two pairs of complimentary CMOS drivers operating in a push- pull mode. Each output is capable of sinking or sourcing nearly 500mA of peak current. They are also capable of absorbing just as much "kick-back" current without latching. SOFT START A soft restart recovery rate may be selected by placing a capacitor from SOFT START (pin 8) to ground. The calculation for the recovery timing is approximately 60 msec/ µF. SOFT START will mediate the start-up from under voltage recovery, power-on, or SHUTDOWN. SHUTDOWN There is a minimum delay, non-latching shutdown fea- ture on the TC35C25 PWM controller. Both outputs may be turned off by applying a positive voltage to SHUTDOWN (pin 10). Typical shutdown threshold is 2.4V. Returning the pin back to ground will reinitialize the soft start cycle. OSCILLATOR SECTION A tri-state feature has been added to accommodate systems which require multiple controllers to be run in a "master/slave" configuration. The timing resistor pin (RT, pin 6) may be tied to VREF to place the sync pin (SYNC, pin 3) in a high impedance state. This will allow the chip to be clocked from an external source. The sync output (OSC OUT, pin 4) of the TC35C25 can drive several sync inputs configured in this manner. OSCILLATOR SYNCHRONIZATION Synchronization of two TC35C25's can be done by making one PWM Controller as the master oscillator to synchronize the slave as follows: 4 3 5 12 6 VREF OSC OUT CT GND RT CT GND RT TCx5C25 5 6 MASTER SLAVE CT SLAVE TC > MASTER TC CT RT RT TCx5C25 SYNC 12 4 3 5 12 6 16 OSC OUT CT GND RT TCx5C25 CT GND RT TCx5C25 5 6 12 MASTER SLAVE CT RT SYNC VREF |
Аналогичный номер детали - TC25C25 |
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Аналогичное описание - TC25C25 |
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