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TC170COE датащи(PDF) 8 Page - Microchip Technology

номер детали TC170COE
подробное описание детали  CMOS Current Mode PWM Controller
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

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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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