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TL284X Datasheet(PDF) 6 Page - Texas Instruments

Part No. TL284X
Description  CURRENT-MODE PWM CONTROLLERS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TL284X Datasheet(HTML) 6 Page - Texas Instruments

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TL284x, TL384x
CURRENT-MODE PWM CONTROLLERS
SLVS038F – JANUARY 1989 – REVISED FEBRUARY 2003
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range, VCC = 15 V (see
Note 4), RT = 10 k, CT = 3.3 nF (unless otherwise specified) (continued)
current-sense section
PARAMETER
TEST CONDITIONS
TL284x
TL384x
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP†
MAX
MIN
TYP†
MAX
UNIT
Voltage amplification
See Notes 6 and 7
2.85
3
3.13
2.85
3
3.15
V/V
Current-sense comparator threshold
COMP at 5 V,
See Note 6
0.9
1
1.1
0.9
1
1.1
V
Supply-voltage rejection ratio
VCC = 12 V to 25 V,
See Note 6
70
70
dB
Input bias current
–2
–10
–2
–10
µA
Delay time to output
150
300
150
300
ns
† 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.
output section
PARAMETER
TEST CONDITIONS
TL284x
TL384x
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP†
MAX
MIN
TYP†
MAX
UNIT
High level output voltage
IOH = –20 mA
13
13.5
13
13.5
V
High-level output voltage
IOH = –200 mA
12
13.5
12
13.5
V
Low level output voltage
IOL = 20 mA
0.1
0.4
0.1
0.4
V
Low-level output voltage
IOL = 200 mA
1.5
2.2
1.5
2.2
V
Rise time
CL = 1 nF,
TA = 25°C
50
150
50
150
ns
Fall time
CL = 1 nF,
TA = 25°C
50
150
50
150
ns
† 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
PARAMETER
TL284x
TL384x
UNIT
PARAMETER
MIN
TYP†
MAX
MIN
TYP†
MAX
UNIT
Start threshold voltage
TLx842, TLx844
15
16
17
14.5
16
17.5
V
Start threshold voltage
TLx843, TLx845
7.8
8.4
9
7.8
8.4
9
V
Minimum operating voltage after startup
TLx842, TLx844
9
10
11
8.5
10
11.5
V
Minimum operating voltage after startup
TLx843, TLx845
7
7.6
8.2
7
7.6
8.2
V
† 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
PARAMETER
TL284x
TL384x
UNIT
PARAMETER
MIN
TYP†
MAX
MIN
TYP†
MAX
UNIT
Maximum duty cycle
TLx842, TLx843
95
97
100
95
97
100
Maximum duty cycle
TLx844, TLx845
46
48
50
46
48
50
%
Minimum duty cycle
0
0
† All typical values are at TA = 25°C.
NOTE 4: Adjust VCC above the start threshold before setting it to 15 V.


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