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TC18C46-1 Datasheet(PDF) 10 Page - TelCom Semiconductor, Inc

Part # TC18C46-1
Description  CMOS CURRENT MODE PWM CONTROLLER
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Manufacturer  TELCOM [TelCom Semiconductor, Inc]
Direct Link  http://www.telcom-semi.com
Logo TELCOM - TelCom Semiconductor, Inc

TC18C46-1 Datasheet(HTML) 10 Page - TelCom Semiconductor, Inc

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TELCOM SEMICONDUCTOR, INC.
PIN DESCRIPTION
Pin No.
Symbol
Description
1
CURRENT LIMIT, SOFT START
Pin for setting the peak current limit threshold of sense inputs pin 3 and pin 4. A
second function of this pin is for Soft-Start programming with a capacitor between this
pin and ground, pin 12.
2
VREF
Pin is an output for the reference supply voltage of 5.1 volts. This reference can supply
a minimum of 20mA of output current.
3
– CURRENT SENSE
Pin is the current sense inverting input for sensing peak current of the pass transistor
through the series current monitor resistor.
4
+ CURRENT SENSE
Pin is the non-inverting input for sensing peak current of the pass transistor. The
positive end of the current sense resistor is connected here.
5
+ ERROR AMP
Pin is the non-inverting input for sensing voltage feedback from output for voltage
regulation.
6
– ERROR AMP
Pin is the inverting input for sensing the reference voltage to regulate the output.
7
COMPENSATION
Pin for compensating the feedback loop response.
8
CT
Pin is the input for timing capacitor, CT, to set oscillator frequency in conjunction with
9 resistor RT, input. A second function is for setting the crossover dead time of the
outputs, pins 11 and 14.
9
RT
Pin is the input for the timing resistor, RT, to set oscillator frequency by setting the
(constant) current charge rate for capacitor CT.
10
SYNC
Pin is the input or output for the oscillator synchronization pulse.
11
OUTA
Pin is the output drive of phase A to drive push pull transistor A.
12
GND
Pin is the ground return path for all input and output signals.
13
VDD
Pin is the supply power input terminal for the output drivers.
14
OUTB
Pin is the output drive of phase B to drive push pull transistor B.
15
VIN
Pin is voltage bias supply input for all circuits except the output drivers
16
SHUT
Pin is an input for shutdown when a 350mV threshold is exceeded: both output drives
will then be terminated.
CMOS CURRENT MODE
PWM CONTROLLERS
TC18C46
TC28C46
TC38C46


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