Electronic Components Datasheet Search |
|
TC18C46MJE Datasheet(PDF) 7 Page - TelCom Semiconductor, Inc |
|
TC18C46MJE Datasheet(HTML) 7 Page - TelCom Semiconductor, Inc |
7 / 10 page 4-107 TELCOM SEMICONDUCTOR, INC. 7 6 5 4 3 1 2 8 Figure 5. External Clock Synchronization Figure 4. Master/Slave Parallel Operation Figure 3. Transformer Isolated Current Sense Under Voltage Lockout The under voltage lockout circuit forces the PWM con- troller outputs OFF (LOW) if the supply voltage is below 7V. Threshold hysteresis is 0.8V and guarantees clean, jitter- free turn-ON and turn-OFF points. The hysteresis also reduces capacitive filtering requirements at the PWM con- troller supply input (pin 15). Circuit Synchronization Current-mode-controlled power supplies can be oper- ated in parallel with a common load. Paralleled converters will equally share the load current. Voltage-mode control- lers unequally share the load current, decreasing system reliability. Two or more of these PWM controllers can be slaved together for parallel operation. Circuits can operate from a master PWM controller internal oscillator with an external driver (Figure 4). Devices can also be slaved to an exter- nal oscillator (Figure 5). Disable internal slave device os- cillators by grounding pin 8. Slave controllers derive an oscillator from the bidirectional synchronization output sig- nal at pin 10. Pin 10 is bidirectional in that it is intended to be both a sync output and input. This is accomplished by making the output driver "weak." This is advantageous in that it elimi- nates an additional pin from the package but does not enable the device to directly drive another device. In order to make it an effective driver, a buffer is required (Figure 4). In order to use pin 10 as a sync input, it is necessary to overcome the internal driver. This requires a pulse with an amplitude equal to VS. Since VS must be above 7V for the undervoltage lockout to be disabled, a CMOS or open- collector TTL driver should be used. 4 3 3.15 CURRENT– SENSE AMPLIFIER TCX8C46 VS N 1 I S VS = IS • RS N × + – + – MASTER RT SYNC CMPTR SLAVE 9 8 9 8 210 7 7 1/2 TC4427 VDD TCx8C46 10 CT VREF CT RT CMPTR SYNC TCx8C46 1/2 TC4427 TCx8C46 TCx8C46 SYNC SYNC EXTERNAL* OSCILLATOR CT 29 29 10 15 15 VDD 8 10 VDD *PULSE WIDTH OF OSCILLATOR IS = TD CT VREF RT RT VREF CMOS CURRENT MODE PWM CONTROLLERS TC18C46 TC28C46 TC38C46 |
Similar Part No. - TC18C46MJE |
|
Similar Description - TC18C46MJE |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |