CMOS CURRENT MODE
PWM CONTROLLER
TC170
ELECTRICAL CHARACTERISTICS (Cont.):
V
IN
= 16V, R
O
= 24kΩ, C
O
= 1nF, T
A
= 25°C, unless otherwise indicated.
Symbol
V
OH
V
OL
t
R
t
F
1
Parameter
Output High Level
Output High Level
Output Rise Time
Output Fall Time
Start-Up
Threshold Hysteresis
Test Conditions
I
SOURCE
= 20mA
I
SOURCE
= 100mA
C
L
= 1000pF
C
L
= 1000pF
Threshold
Min
V
DD
– 1V
V
DD
– 4V
Typ
Max
Unit
V
V
nsec
nsec
V
V
mA
Output Stage
(Cont.)
2
3
4
5
6
7
50
50
7.15
0.5
7.7
0.75
2.7
150
150
8.25
1
3.8
Undervoltage Lockout
Supply
I
S
Standby Supply Current
PIN DESCRIPTION
Pin No.
(16-Pin PDIP)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Symbol
SOFT START/I
LIM
V
REF
OUT
– I
SENSE
IN
+ I
SENSE
IN
+ ERROR AMP IN
– ERROR AMP IN
CMPTR
C
O
R
O
SYNC
OUTPUT A
GND
V
DD
OUTPUT B
V
IN
SHUTDOWN
Description
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.
Reference supply output of 5.1 volts. It can supply a minimum of 10mA.
– Current Sense Input. Inverting input for sensing peak current of the pass transistor
through series sense current monitor resistor.
+ Current Sense Input. Non-inverting input used in conjunction with pin 3. This senses the
positive end of current monitor resistor.
+ Error Amp In. Non-inverting input for output voltage regulation.
– Error Amp In. Inverting input of the amplifier for the reference voltage.
For compensation of the feedback loop response.
Timing capacitor (C
O)
input to set oscillator frequency in conjunction with pin 9, R
O
, resistor
input. Second function is for setting crossover dead time of pin 11and 14 outputs.
Timing resistor (R
O)
input to set oscillator frequency by setting constant current charge rate
to charge capacitor C
O
.
For PWM controller oscillator synchronization of two or more controllers. or as a clock input
to sync oscillator from external signal.
A output drive of phase A from push pull transistors.
Ground return for all input and output pins.
Supplies power to operate the output drivers only.
Output of phase B from push pull transistors.
Voltage bias supply for all TC170 circuits except the output transistors.
Input pin to disable both output drives to 0V OFF.
PIN CONFIGURATIONS
(DIP and SOIC)
SOFT START/
ILIM 1
VREFOUT 2
– I SENSE IN 3
+ I SENSE IN 4
+ ERROR AMP IN 5
– ERROR AMP IN 6
CMPTR 7
CO 8
16 SHDN
15 VIN
14 OUTPUT B
13 VDD
12 GND
11 OUTPUT A
10 SYNC
9 RO
CINT
VSS
CAZ
BUF
ACOM
CREF
CREF
VREF
–
+
–
1
2
3
4
5
6
7
8
16
15
14
VDD
DIGITAL GND
CMPTR OUT
B
A
+
VIN
–
VIN
+
TC170
CPE
TC170COE
13
12
11
10
9
VREF
NOTE:
Outputs LOW in "OFF" state.
8
4-121
TELCOM SEMICONDUCTOR, INC.
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
