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TC170 Datasheet(PDF) 5 Page - Microchip Technology

Part No. TC170
Description  CMOS Current Mode PWM Controller
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Maker  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
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TC170 Datasheet(HTML) 5 Page - Microchip Technology

 
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© 2002 Microchip Technology Inc.
DS21395B-page 5
TC170
2.0
PIN DESCRIPTIONS
Thedescriptionsof the pins arelistedinTable2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Pin No.
(16-Pin PDIP,
SOIC)
Symbol
Description
1SOFT START/ILIM Soft Start Adjust/Current Limit. For setting the peak current threshold of sense inputs (pins 3
and 4). Second function of this pin is Soft-Start Adjust.
2VREFOUT
Reference supply output of 5.1 volts. It can supply a minimum of 10mA.
3-ISENSEIN
-Current Sense Input. Inverting input for sensing peak current of the pass transistor through
series sense current monitor resistor.
4+ISENSEIN
+Current Sense Input. Non-inverting input used in conjunction with pin 3. This senses the
positive end of current monitor resistor.
5
+ERROR AMP IN +Error Amp In. Non-inverting input for output voltage regulation.
6
-ERROR AMP IN
-Error Amp In. Inverting input of the amplifier for the reference voltage.
7
CMPTR
For compensation of the feedback loop response.
8CO
Timing capacitor (CO) input to set oscillator frequency in conjunction with pin 9, RO,resistor
input. Second function is for setting crossover dead time of pin 11and 14 outputs.
9RO
Timing resistor (RO) input to set oscillator frequency by setting constant current charge rate to
charge capacitor CO.
10
SYNC
For PWM controller oscillator synchronization of two or more controllers. Or as a clock input to
sync oscillator from external signal.
11
OUTPUT A
A output drive of phase A from push pull transistors.
12
GND
Ground return for all input and output pins.
13
VDD
Supplies power to operate the output drivers only.
14
OUTPUT B
Output of phase B from push pull transistors.
15
VIN
Voltage bias supply for all TC170 circuits except the output transistors.
16
SHDN
Input pin to disable both output drives to 0V OFF.


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