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TC170COE Datasheet(PDF) 3 Page - TelCom Semiconductor, Inc

Part # TC170COE
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

TC170COE Datasheet(HTML) 3 Page - TelCom Semiconductor, Inc

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TELCOM SEMICONDUCTOR, INC.
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ELECTRICAL CHARACTERISTICS (Cont.): VIN = 16V, RO = 24kΩ, CO = 1nF, TA = 25°C, unless otherwise indicated.
Symbol
Parameter
Test Conditions
Min
Typ
Max
Unit
Output Stage (Cont.)
VOH
Output High Level
ISOURCE = 20mA
VDD – 1V
V
VOL
Output High Level
ISOURCE = 100mA
VDD – 4V
V
tR
Output Rise Time
CL = 1000pF
50
150
nsec
tF
Output Fall Time
CL = 1000pF
50
150
nsec
Undervoltage Lockout
Start-Up
Threshold
7.15
7.7
8.25
V
Threshold Hysteresis
0.5
0.75
1
V
Supply
IS Standby Supply Current
2.7
3.8
mA
Pin No.
(16-Pin PDIP)
Symbol
Description
1
SOFT 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.
2VREF OUT
Reference supply output of 5.1 volts. It can supply a minimum of 10mA.
3– ISENSE IN
– Current Sense Input. Inverting input for sensing peak current of the pass transistor
through series sense current monitor resistor.
4+ ISENSE IN
+ 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
SHUTDOWN
Input pin to disable both output drives to 0V OFF.
PIN CONFIGURATIONS (DIP and SOIC)
TC170
CPE
SHDN
VDD
SOFT START/
ILIM
OUTPUT B
VREF
– I SENSE IN
+ I SENSE IN
+ ERROR AMP IN
CMPTR
GND
OUTPUT A
SYNC
RO
OUT
– ERROR AMP IN
NOTE: Outputs LOW in "OFF" state.
VIN
CO
1
2
3
4
16
15
14
13
5
6
7
12
11
10
9
8
ACOM
1
2
3
4
15
16
14
13
5
6
7
12
11
10
9
8
TC170COE
BUF
VSS
CINT
+
VREF
CREF
CREF
CAZ
CMPTR OUT
A
DIGITAL GND
B
VDD
+
+
VIN
VIN
VREF
CMOS CURRENT MODE
PWM CONTROLLER
TC170
PIN DESCRIPTION


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