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PDF LM3406HV Data sheet ( Hoja de datos )
| Número de pieza | LM3406HV | |
| Descripción | 1.5A Constant Current Buck Regulator | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM3406HV (archivo pdf) en la parte inferior de esta página. Total 32 Páginas | ||
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LM3406,LM3406HV
LM3406/06HV 1.5A Constant Current Buck Regulator for Driving High Power
LEDs
www.DataSheet.net/
Literature Number: SNVS512C
Datasheet pdf - http://www.DataSheet4U.co.kr/
1 page  
Symbol
Parameter
VCC-UV-TH
VCC Under-voltage Lock-out
Threshold
VCC-UV-HYS
VCC Under-voltage Lock-out
Hysteresis
IIN-OP
IIN-SD
CURRENT LIMIT
IIN Operating Current
IIN Shutdown Current
ILIM Current Limit Threshold
DIM COMPARATOR
VIH Logic High
VIL Logic Low
IDIM-PU
DIM Pull-up Current
MOSFET AND DRIVER
RDS-ON
VDR-UVLO
Buck Switch On Resistance
BOOT Under-voltage Lock-out
Threshold
VDR-HYS
BOOT Under-voltage Lock-out
Hysteresis
THERMAL SHUTDOWN
TSD Thermal Shutdown Threshold
TSD-HYS
Thermal Shutdown Hysteresis
THERMAL RESISTANCE
θJA Junction to Ambient
Conditions
VCC Increasing
VCC Decreasing
Non-switching, CS = 0.5V
RON = 0V
DIM Increasing
DIM Decreasing
DIM = 1.5V
ISW = 200 mA, BOOT = 6.3V
BOOT–SW Increasing
BOOT–SW Decreasing
eTSSOP-14 Package (Note 4)
Min Typ Max Units
5.3 V
150 mV
1.2 mA
240 350 µA
1.7 2.1 2.7
A
2.2 V
0.8 V
80 µA
0.37 0.75
1.7 2.9 4.3
Ω
V
370 mV
165 °C
25 °C
50 °C/W
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur, including inoperability and degradation of device reliability
and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or other conditions beyond those indicated in
the Operating Ratings is not implied. The recommended Operating Ratings indicate conditions at which the device is functional and the device should not be
operated beyond such conditions.
www.DataSheet.net/
Note 2: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin.
Note 3: Typical values represent most likely parametric norms at the conditions specified and are not guaranteed.
Note 4: θJA of 50°C/W with DAP soldered to a minimum of 2 square inches of 1oz. copper on the top or bottom PCB layer.
Note 5: Specified with junction temperature from 0°C - 125°C.
Note 6: VIN = 24V, IF = 1A, TA = 25°C, and the load consists of three InGaN LEDs in series unless otherwise noted. See the Bill of Materials table at the end of
the datasheet.
www.national.com
4
Datasheet pdf - http://www.DataSheet4U.co.kr/
5 Page 
FIGURE 3. Dimming with a Parallel FET
30020327
PEAK CURRENT LIMIT
The current limit comparator of the LM3406/06HV will engage
whenever the power MOSFET current (equal to the inductor
current while the MOSFET is on) exceeds 2.1A (typical). The
power MOSFET is disabled for a cool-down time that of ap-
proximately 100 µs. At the conclusion of this cool-down time
the system re-starts. If the current limit condition persists the
cycle of cool-down time and restarting will continue, creating
a low-power hiccup mode, minimizing thermal stress on the
LM3406/06HV and the external circuit components.
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OVER-VOLTAGE/OVER-CURRENT COMPARATOR
The CS pin includes an output over-voltage/over-current
comparator that will disable the power MOSFET whenever
VSNS exceeds 300 mV. This threshold provides a hard limit
for the output current. Output current overshoot is limited to
300 mV / RSNS by this comparator during transients. The OVP/
OCP comparator limits the maximum ripple voltage at the CS
pin to 200 mVP-P.
OUTPUT OPEN-CIRCUIT
The most common failure mode for power LEDs is a broken
bond wire, and the result is an output open-circuit. When this
happens the feedback path is disconnected, and the output
voltage will attempt to rise. In buck converters the output volt-
age can only rise as high as the input voltage, and the
minimum off-time requirement ensures that VO(MAX) is slightly
less than VIN. Figure 4 shows a method using a zener diode,
Z1, and zener limiting resistor, RZ, to limit output voltage to
the reverse breakdown voltage of Z1 plus 200 mV. The zener
diode reverse breakdown voltage, VZ, must be greater than
the maximum combined VF of all LEDs in the array. The max-
imum recommended value for RZ is 1 kΩ.
The output stage (SW and VOUT pins) of the LM3406/06HV
is capable of withstanding VO(MAX) indefinitely as long as the
output capacitor is rated to handle the full input voltage. When
an LED fails open-circuit and there is no output capacitor
present the surge in output voltage due to the collapsing mag-
netic field in the output inductor can exceed VIN and can
damage the LM3406/06HV IC. As an alternative to the zener
clamp method described previously, a diode can be connect-
ed from the output to the input of the regulator circuit that will
clamp the inductive surge to one VD above VIN.
Regardless of which protection method is used a resistance
in series with the VOUT pin, ROUT, is recommended to limit
the current in the event the VOUT pin is pulled below ground
when the LED circuit is reconnected. This can occur frequent-
ly if the lead lengths to the LEDs are long and the inductance
is significant. A resistor between 1 kΩ and 10 kΩ is recom-
mended.
www.national.com
10
Datasheet pdf - http://www.DataSheet4U.co.kr/
11 Page | ||
| Páginas | Total 32 Páginas | |
| PDF Descargar | [ Datasheet LM3406HV.PDF ] | |
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