TL284X_07 Datasheet, PDF (6/18 Pages) Texas Instruments – CURRENT-MODE PWM CONTROLLERS

TL284x, TL384x
CURRENT-MODE PWM CONTROLLERS
SLVS038F – JANUARY 1989 – REVISED FEBRUARY 2003
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) (continued)
current-sense section
PARAMETER
TEST CONDITIONS
TL284x
MIN TYP^† MAX
TL384x
MIN TYP^†
Voltage amplification
See Notes 6 and 7
2.85
3 3.13 2.85
3
Current-sense comparator threshold COMP at 5 V,
See Note 6
0.9
1 1.1 0.9
1
Supply-voltage rejection ratio
Input bias current
VCC = 12 V to 25 V, See Note 6
70
70
–2 –10
–2
Delay time to output
150 300
150
† _{All typical values are at TA = 25°C.}
NOTES: 4. Adjust VCC above the start threshold before setting it to 15 V.
6. These parameters are measured at the trip point of the latch, with VFB at 0 V.
7. Voltage amplification is measured between ISENSE and COMP, with the input changing from 0 V to 0.8 V.
MAX
3.15
1.1
–10
300
UNIT
V/V
V
dB
µA
ns
output section
PARAMETER
TEST CONDITIONS
High-level output voltage
IOH = –20 mA
IOH = –200 mA
Low-level output voltage
IOL = 20 mA
IOL = 200 mA
Rise time
CL = 1 nF,
TA = 25°C
Fall time
CL = 1 nF,
TA = 25°C
† _{All typical values are at TA = 25°C.}
NOTE 4: Adjust VCC above the start threshold before setting it to 15 V.
undervoltage-lockout section
TL284x
MIN TYP^†
13 13.5
12 13.5
0.1
1.5
50
50
MAX
0.4
2.2
150
150
TL384x
MIN TYP^†
13 13.5
12 13.5
0.1
1.5
50
50
MAX
0.4
2.2
150
150
UNIT
V
V
ns
ns
PARAMETER
Start threshold voltage
TLx842, TLx844
TLx843, TLx845
Minimum operating voltage after startup
TLx842, TLx844
TLx843, TLx845
† _{All typical values are at TA = 25°C.}
NOTE 4: Adjust VCC above the start threshold before setting it to 15 V.
pulse-width-modulator section
TL284x
MIN TYP^†
15
16
7.8 8.4
9
10
7 7.6
MAX
17
9
11
8.2
TL384x
MIN TYP^†
14.5
16
7.8 8.4
8.5
10
7 7.6
MAX
17.5
9
11.5
8.2
UNIT
V
V
PARAMETER
Maximum duty cycle
TLx842, TLx843
TLx844, TLx845
Minimum duty cycle
† _{All typical values are at TA = 25°C.}
NOTE 4: Adjust VCC above the start threshold before setting it to 15 V.
TL284x
MIN TYP^†
95
97
46
48
MAX
100
50
0
TL384x
MIN TYP^†
95
97
46
48
MAX
100
50
0
UNIT
%
6
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