Datasheet

TL284x, TL384x
CURRENT-MODE PWM CONTROLLERS
SLVS038G − JANUARY 1989 − REVISED FEBRUARY 2008
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range, V
CC
= 15 V (see
Note 4), R
T
= 10 kΩ, C
T
= 3.3 nF (unless otherwise specified)
reference section
PARAMETER
TEST CONDITIONS
TL284x TL384x
UNIT
PARAMETER TEST CONDITIONS
MIN TYP
†
MAX MIN TYP
†
MAX
UNIT
Output voltage I
O
= 1 mA, T
A
= 25°C 4.95 5 5.05 4.9 5 5.1 V
Line regulation V
CC
= 12 V to 25 V 6 20 6 20 mV
Load regulation I
O
= 1 mA to 20 mA 6 25 6 25 mV
Temperature coefficient
of output voltage
0.2 0.4 0.2 0.4 mV/°C
Output voltage
with worst-case variation
V
CC
= 12 V to 25 V, I
O
= 1 mA to 20 mA 4.9 5.1 4.82 5.18 V
Output noise voltage f = 10 Hz to 10 kHz, T
A
= 25°C 50 50 µV
Output-voltage long-term drift After 1000 h at T
A
= 25°C 5 25 5 25 mV
Short-circuit output current −30 −100 −180 −30 −100 −180 mA
†
All typical values are at T
A
= 25°C.
NOTE 4: Adjust V
CC
above the start threshold before setting it to 15 V.
oscillator section
PARAMETER
TEST CONDITIONS
TL284x TL384x
UNIT
PARAMETER TEST CONDITIONS
MIN TYP
†
MAX MIN TYP
†
MAX
UNIT
Oscillator frequency (see Note 5) T
A
= 25°C 47 52 57 47 52 57 kHz
Frequency change with supply voltage V
CC
= 12 V to 25 V 2 10 2 10 Hz/kHz
Frequency change with temperature 50 50 Hz/kHz
Peak-to-peak amplitude at RT/CT 1.7 1.7 V
†
All typical values are at T
A
= 25°C.
NOTES: 4. Adjust V
CC
above the start threshold before setting it to 15 V.
5. Output frequency equals oscillator frequency for the TLx842 and TLx843. Output frequency is one-half the oscillator frequency for
the TLx844 and TLx845.
error-amplifier section
PARAMETER
TEST CONDITIONS
TL284x TL384x
UNIT
PARAMETER TEST CONDITIONS
MIN TYP
†
MAX MIN TYP
†
MAX
UNIT
Feedback input voltage COMP at 2.5 V 2.45 2.50 2.55 2.42 2.50 2.58 V
Input bias current −0.3 −1 −0.3 −2 µA
Open-loop voltage amplification V
O
= 2 V to 4 V 65 90 65 90 dB
Gain-bandwidth product 0.7 1 0.7 1 MHz
Supply-voltage rejection ratio V
CC
= 12 V to 25 V 60 70 60 70 dB
Output sink current VFB at 2.7 V, COMP at 1.1 V 2 6 2 6 mA
Output source current VFB at 2.3 V, COMP at 5 V −0.5 −0.8 −0.5 −0.8 mA
High-level output voltage VFB at 2.3 V, R
L
= 15 kΩ to GND 5 6 5 6 V
Low-level output voltage VFB at 2.7 V, R
L
= 15 kΩ to GND 0.7 1.1 0.7 1.1 V
†
All typical values are at T
A
= 25°C.
NOTE 4: Adjust V
CC
above the start threshold before setting it to 15 V.