TL284x, TL384x
CURRENT-MODE PWM CONTROLLERS
SLVS038E – JANUARY 1989 – REVISED DECEMBER 1999
electrical characteristics over recommended operating free-air temperature range, V = 15 V (see
CC
Note 4), R = 10 kΩ, C = 3.3 nF (unless otherwise specified)
T
T
reference section
TL284x
TL384x
PARAMETER
TEST CONDITIONS
UNIT
†
†
MIN TYP
MAX
5.05
20
MIN TYP
MAX
5.1
20
Output voltage
Line regulation
Load regulation
I
= 1 mA,
T
A
= 25°C
4.95
5
6
6
4.9
5
6
6
V
O
V
= 12 V to 25 V
CC
= 1 mA to 20 mA
mV
mV
I
O
25
25
Temperature coefficient
of output voltage
0.2
0.4
5.1
0.2
0.4 mV/°C
Output voltage
with worst-case variation
V
= 12 V to 25 V,
I
= 1 mA to 20 mA
4.9
4.82
–30
5.18
V
CC
f = 10 Hz to 10 kHz,
After 1000 h at T = 25°C
O
Output noise voltage
T
= 25°C
50
5
50
5
µV
mV
mA
A
Output-voltage long-term drift
Short-circuit output current
25
25
A
–30
–100
–180
–100
–180
†
All typical values are at T = 25°C.
A
NOTE 4: Adjust V
above the start threshold before setting it to 15 V.
CC
oscillator section
TL284x
TL384x
PARAMETER
TEST CONDITIONS
= 25°C
UNIT
†
†
MIN TYP
MAX
57
MIN TYP
MAX
Oscillator frequency (see Note 5)
Frequency change with supply voltage
Frequency change with temperature
Peak-to-peak amplitude at RT/CT
T
47
52
2
47
52
2
57
kHz
A
V
= 12 V to 25 V
10
10 Hz/kHz
Hz/kHz
V
CC
50
1.7
50
1.7
†
All typical values are at T = 25°C.
A
NOTES: 4. Adjust V
above the start threshold before setting it to 15 V.
CC
5. Output frequency equals oscillator frequency for the TLx842 and TLx843. Output frequency is one-half oscillator frequency for the
TLx844 and TLx845.
error-amplifier section
TL284x
TL384x
PARAMETER
TEST CONDITIONS
COMP at 2.5 V
UNIT
†
†
MIN TYP
MAX
2.55
–1
MIN TYP
MAX
2.58
–2
Feedback input voltage
Input bias current
2.45
2.50
–0.3
90
2.42
2.50
–0.3
90
V
µA
dB
MHz
dB
mA
mA
V
Open-loop voltage amplification
Gain-bandwidth product
Supply-voltage rejection ratio
Output sink current
V
O
= 2 V to 4 V
65
0.7
60
65
0.7
60
1
1
V
CC
= 12 V to 25 V
70
70
VFB at 2.7 V,
VFB at 2.3 V,
VFB at 2.3 V,
VFB at 2.7 V,
COMP at 1.1 V
COMP at 5 V
2
6
2
6
Output source current
High-level output voltage
Low-level output voltage
–0.5
5
–0.8
6
–0.5
5
–0.8
6
R
R
= 15 kΩ to GND
= 15 kΩ to GND
L
L
0.7
1.1
0.7
1.1
V
†
All typical values are at T = 25°C.
A
NOTE 4: Adjust V
above the start threshold before setting it to 15 V.
CC
4
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TI [ TEXAS INSTRUMENTS ]
