BiCMOS CURRENT MODE
PWM CONTROLLERS
TC18C43
TC28C43
TC38C43
BENCH TEST OPERATIONAL SIMULATION
R
T
1
8
10k
CMPTR
V
REF
Q1
100k
4.7µF
2N2222
OR EQUIV
2
3
7
6
V
V
V
(15V)
5k
FB
IN
DD
1µF
R = 1k, 1W
I
RAMP
I
OUTPUT
GND
5k
SENSE
L
4
5
R /C
GND
10k
T
T
C
T
TYPICAL CHARACTERISTICS
Oscillator Frequency Changes
vs. Temperature
Start Current vs. Temperature
I
to Out Delay
SENSE
101
100
99
150
140
150
V
= V
START
V = 15V
IN
145
140
135
130
125
120
115
110
105
IN
130
120
110
100
90
MAX TYP
98
97
MIN TYP
100
96
60
–60–40 –20
0
20 40 60 80 100120140
–60 –40–20
0
20 40
80 100120 140
–55
0
25
50
70
125
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
4-98
TELCOM SEMICONDUCTOR, INC.
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
