TC18C43
TC28C43
TC38C43
BiCMOS CURRENT MODE
PWM CONTROLLERS
BENCH TEST OPERATIONAL SIMULATION
10k
Q1
RT
100k
1
CMPTR
VREF
8
4.7µF
5k
5k
10k
2N2222
OR EQUIV
IRAMP
2
3
4
VFB
ISENSE
RT/CT
VIN
OUTPUT
GND
7
6
5
1µF
RL = 1k, 1W
VDD (15V)
GND
CT
TYPICAL CHARACTERISTICS
Start Current vs. Temperature
150
145
140
135
ISTART (µA)
Oscillator Frequency Changes
vs. Temperature
101
150
VIN = 15V
100
FREQUENCY (kHz)
DELAY (nse c)
ISENSE to Out Delay
140
130
120
110
100
90
–55
VIN = VSTART
MAX TYP
130
125
120
115
110
105
MIN TYP
100
–60 –40 –20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
99
98
97
96
–60 –40 –20 0 20 40 60 80 100120 140
TEMPERATURE (°C)
0
25
50
70
TEMPERATURE (°C)
125
4-98
TELCOM SEMICONDUCTOR, INC.
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
