LM3407 Datasheet, PDF (4/22 Pages) National Semiconductor (TI) – 350 mA, Constant Current Output Floating Buck Switching Converter for High Power LEDs

LM3407
SNVS553B – JANUARY 2008 – REVISED MAY 2013
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ELECTRICAL CHARACTERISTICS
V_IN = 12V unless otherwise indicated. Typical and limits appearing in plain type apply 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
specified by design, test, or statistical analysis.
Parameter
Test Conditions
Min Typ Max Units
SYSTEM PARAMETERS
I_IN
Operating Input Current
I_Q
Quiescent Input current
I_SHUT
V_UVLO
V_UVLO-HYS
V_{EN_H}
V_{EN_L}
V_{DIM_H}
V_{DIM_L}
f_SW
Shutdown Input Current
Input Under Voltage Lock-out Threshold
UVLO Hysteresis
EN pin HIGH Threshold
EN pin LOW Threshold
DIM pin HIGH Threshold
DIM pin LOW Threshold
Switching Frequency
t_ON-MIN
Minimum On-time
T_SD
Thermal Shutdown Threshold
T_SD-HYS
Thermal Shutdown Hysteresis
INTERNAL VOLTAGE REGULATOR
V_CC
VCC Regulator Output Voltage ⁽¹⁾
N-MOSFET DRIVER
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
V_IN Rising
V_IN Falling
V_EN Rising
V_EN Falling
V_DIM Rising
V_DIM Falling
R_T = 80 kΩ
R_T = 40 kΩ
V_IN = 12V
0.58 0.78 0.98 mA
0.20 0.27 0.39 mA
36
48
60
µA
3.6
4.5
V
200
mV
1.9
2.4
V
1.3 1.75
V
1.9
2.4
V
1.3 1.75
V
500
kHz
1000
200
ns
165
°C
25
°C
4.5
V
R_DS(ON)
Main Switch ON Resistance
CONTROL LOOP
I_sink = 80mA
0.77 1.45
Ω
A_EA
Error Amp Open Loop Gain
60
dB
(1) V_CC provides self bias for the internal gate drive and control circuits. Device thermal limitations limit external loading to the pin.
4
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