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LM3402 Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LM3402
Description  0.5A Constant Current Buck Regulator for Driving High Power LEDs
PDF  22 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3402 Datasheet(HTML) 4 Page - National Semiconductor (TI)

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Electrical Characteristics V
IN = 24V unless otherwise indicated. Typicals and limits appearing in plain type
apply for T
A =TJ = +25˚C. (Note 4) Limits appearing in boldface type apply over full Operating Temperature Range.
Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
LM3402
Symbol
Parameter
Conditions
Min
Typ
Max
Units
SYSTEM PARAMETERS
t
ON-1
On-time 1
V
IN = 10V, RON = 200 k
Ω
2.1
2.75
3.4
µs
t
ON-2
On-time 2
V
IN = 40V, RON = 200 k
Ω
490
650
810
ns
LM3402HV
Symbol
Parameter
Conditions
Min
Typ
Max
Units
SYSTEM PARAMETERS
t
ON-1
On-time 1
V
IN = 10V, RON = 200 k
Ω
2.1
2.75
3.4
µs
t
ON-2
On-time 2
V
IN = 70V, RON = 200 k
Ω
290
380
470
ns
LM3402/LM3402HV
Symbol
Parameter
Conditions
Min
Typ
Max
Units
REGULATION AND OVER-VOLTAGE COMPARATORS
V
REF-REG
CS Regulation Threshold
CS Decreasing, SW turns on
194
200
206
mV
V
REF-0V
CS Over-voltage Threshold
CS Increasing, SW turns off
300
mV
I
CS
CS Bias Current
CS = 0V
0.1
µA
SHUTDOWN
V
SD-TH
Shutdown Threshold
R
ON / SD Increasing
0.3
0.7
1.05
V
V
SD-HYS
Shutdown Hysteresis
R
ON / SD Decreasing
40
mV
OFF TIMER
t
OFF-MIN
Minimum Off-time
CS = 0V
300
ns
INTERNAL REGULATOR
V
CC-REG
V
CC Regulated Output
6.6
7
7.4
V
V
IN-DO
V
IN -VCC Dropout
I
CC = 5 mA, 6.0V < VIN < 8.0V
300
mV
V
CC-BP-TH
V
CC Bypass Threshold
V
IN Increasing
8.8
V
V
CC-BP-HYS
V
CC Bypass Hysteresis
V
IN Decreasing
225
mV
V
CC-Z-6
V
CC Output Impedance
(0 mA < I
CC < 5 mA)
V
IN =6V
55
Ω
V
CC-Z-8
V
IN =8V
50
V
CC-Z-24
V
IN = 24V
0.4
V
CC-LIM
V
CC Current Limit (Note 3)
V
IN = 24V, VCC =0V
16
mA
V
CC-UV-TH
V
CC Under-voltage Lock-out
Threshold
V
CC Increasing
5.25
V
V
CC-UV-HYS
V
CC Under-voltage Lock-out
Hysteresis
V
CC Decreasing
150
mV
V
CC-UV-DLY
V
CC Under-voltage Lock-out
Filter Delay
100 mV Overdrive
3
µs
I
IN-OP
I
IN Operating Current
Non-switching, CS = 0V
600
900
µA
I
IN-SD
I
IN Shutdown Current
RON / SD = 0V
90
180
µA
CURRENT LIMIT
I
LIM
Current Limit Threshold
530
735
940
mA
DIM COMPARATOR
V
IH
Logic High
DIM Increasing
2.2
V
V
IL
Logic Low
DIM Decreasing
0.8
V
I
DIM-PU
DIM Pull-up Current
DIM = 1.5V
75
µA
www.national.com
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