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參數(shù)資料
| 型號(hào)： | LM3407 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 350 mA, Constant Current Output Floating Buck Switching Converter for High Power LEDs |
| 中文描述： | 350毫安，恒流輸出浮點(diǎn)高功率LED的降壓開關(guān)轉(zhuǎn)換器 |
| 文件頁數(shù)： | 3/16頁 |
| 文件大小： | 321K |
| 代理商： | LM3407 |
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
VIN to GND
VIN to GND (Transient)
LX to GND
LX to GND (Transient)
ISNS, FS, DIM, EN to GND
ESD Rating
Human Body Model (Note 2)
Electrical Characteristics
for T
A
= T
J
= 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.
-0.3V to 36V
42V (500 ms)
-0.3V to 36V
-3V (2 ns), 42V (500 ms)
-0.3V to 7V
2kV
Junction Temperature
Storage Temperature
Soldering Information
Lead Temperature (Soldering,
10sec)
Infrared or Convection (20sec)
150°C
65°C to + 125°C
260°C
235°C
Operating Ratings
V
IN
Junction Temperature Range
Thermal Resistance (
θ
JA
) (Note 3)
4.5V to 30V
40°C to + 125°C
50°C/W
V
IN
= 12V unless otherwise indicated. Typical and limits appearing in plain type apply
Symbol
Parameter
Conditions
Min
Typ
Max
Units
SYSTEM PARAMETERS
I
IN
Operating Input Current
4.5V
≤
V
IN
≤
30V
V
EN
= 5V, V
PWM
= 5V, LX = open
4.5V
≤
V
IN
≤
30V
V
EN
= 5V, V
PWM
= 0V
V
EN
= 0V
0.58
0.78
0.98
mA
I
Q
Quiescent Input current
0.20
0.27
0.39
mA
I
SHUT
V
UVLO
V
UVLO-HYS
V
EN_H
V
EN_L
V
DIM_H
V
DIM_L
f
SW
Shutdown Input Current
36
48
60
4.5
μA
Input Under Voltage Lock-out Threshold V
IN
Rising
UVLO Hysteresis
3.6
V
V
IN
Falling
V
EN
Rising
V
EN
Falling
V
DIM
Rising
V
DIM
Falling
R
T
= 80 k
R
T
= 40 k
200
mV
EN pin HIGH Threshold
1.9
2.4
V
EN pin LOW Threshold
1.3
1.75
V
DIM pin HIGH Threshold
1.9
2.4
V
DIM pin LOW Threshold
1.3
1.75
V
Switching Frequency
500
kHz
1000
t
ON-MIN
T
SD
T
SD-HYS
Minimum On-time
200
ns
Thermal Shutdown Threshold
165
°C
Thermal Shutdown Hysteresis
25
°C
I
NTERNAL VOLTAGE REGULATOR
V
CC
N-MOSFET DRIVER
R
DS(ON)
CONTROL LOOP
A
EA
VCC Regulator Output Voltage (Note 5) V
IN
= 12V
4.5
V
Main Switch ON Resistance
I
sink
= 80mA
0.77
1.45
Error Amp Open Loop Gain
60
dB
Note 1:
Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the
device is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2:
The human body model is a 100pF capacitor discharged through a 1.5k
resistor into each pin.
Note 3:
θ
JA
of 50°C/W with thermal pad, EP soldered to a minimum of 2 square inches of 1 oz. Copper on the top or bottom PCB layer.
Note 4:
Typical specification represent the most likely parametric norm at 25°C operation.
Note 5:
V
CC
provides self bias for the internal gate drive and control circuits. Device thermal limitations limit external loading to the pin.
3
www.national.com
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