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TC170CPE Datasheet(PDF) 8 Page - Microchip Technology |
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TC170CPE Datasheet(HTML) 8 Page - Microchip Technology |
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8 / 16 page  TC170 DS21395B-page 8 © 2002 Microchip Technology Inc. FIGURE 3-4: TRANSFORMER ISOLATED CURRENT SENSE 3.6 Undervoltage Lockout The undervoltage lockout circuit forces the TC170 outputs OFF (low) if the supply voltage is below 7.7V. Threshold hysteresis is 0.75V and guarantees clean, jitter-free turn-on and turnoff points. The hysteresis also reduces capacitive filtering requirements at the PWM controller supply input (pin 15). 3.7 Circuit Synchronization Current-mode-controlled power supplies can be operated in parallel with a common load. Paralleled converters will equally share the load current. Voltage- mode controllers unequally share the load current, decreasing system reliability. Two or more TC170 controllers can be slaved together for parallel operation. Circuits can operate from a master TC170 internal oscillator with an external driver (Figure 3-5). Devices can also be slaved to an external oscillator (Figure 3-6). Disable internal slave device oscillators by grounding pin 8. Slave controllers derive an oscillator from the bidirectional synchronization output signal 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 eliminates 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 3-5). 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 VIN. Since VIN must be above 8.25V for the undervoltage lockout to be disabled, a CMOS or open-collector TTL driver should be used. FIGURE 3-5: MASTER/SLAVE PARALLEL OPERATION FIGURE 3-6: EXTERNAL CLOCK SYNCHRONIZATION 4 3 VS N1 IS VS = IS • RS N + – + – x 3.15 Current Sense Amplifier TC170 Master SYNC CMPTR Slave 9 8 9 8 210 7 7 1/2 TC4427 10 CMPTR SYNC CO RO TC170 TC170 CO RO VDD VREF 1/2 TC4427 SYNC External* Oscillator 29 29 10 15 15 8 10 VS + VDD *Pulse Width of Oscillator is = TD CO VREF RO VIN TC170 TC170 SYNC CO VREF RO VIN |
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