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LM3406HV Folha de dados(PDF) 10 Page - Texas Instruments

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Nome de Peças LM3406HV
Descrição Electrónicos  1.5A Constant Current Buck Regulator for Driving High Power LEDs
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
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LM3406, LM3406HV
SNVS512C – SEPTEMBER 2008 – REVISED FEBRUARY 2010
www.ti.com
MINIMUM ON-TIME
The minimum on-time for the LM3406/06HV is 280 ns (typical). One practical example of reaching the minimum
on-time is when dimming the LED light output with a power FET placed in parallel to the LEDs. When the FET is
on, the output voltage drops to 200 mV. This results in a small duty cycle and in most circuits requires an on-time
that would be less than 280 ns. In such a case the LM3406/06HV keeps the on-time at 280 ns and increases the
off-time as much as needed, which effectively reduces the switching frequency.
HIGH VOLTAGE BIAS REGULATOR (VCC)
The LM3406/06HV contains an internal linear regulator with a 7V output, connected between the VIN and the
VCC pins. The VCC pin should be bypassed to the GND pin with a 0.1 µF ceramic capacitor connected as close
as possible to the pins of the IC. VCC tracks VIN until VIN reaches 8.8V (typical) and then regulates at 7V as
VIN increases. The LM3406/06HV comes out of UVLO and begins operating when VCC crosses 5.3V. This is
shown graphically in the Typical Performance curves.
Connecting an external supply to VCC to power the gate drivers is not recommended. However, it may be done if
certain precautions are taken. Be sure that the external supply will not violate any absolute maximum conditions
and will at no point exceed the voltage applied to the VIN pins. Under certain conditions, some ringing may be
present on the SW and BOOT pins when VCC is driven with an external supply. It is important to ensure that the
absolute maximum ratings of these pins are not violated during the ringing or else damage to the device may
occur.
INTERNAL MOSFET AND DRIVER
The LM3406/06HV features an internal power MOSFET as well as a floating driver connected from the SW pin to
the BOOT pin. Both rise time and fall time are 20 ns each (typical) and the approximate gate charge is 9 nC. The
high-side rail for the driver circuitry uses a bootstrap circuit consisting of an internal high-voltage diode and an
external 22 nF capacitor, CB. VCC charges CB through the internal diode while the power MOSFET is off. When
the MOSFET turns on, the internal diode reverse biases. This creates a floating supply equal to the VCC voltage
minus the diode drop to drive the MOSFET when its source voltage is equal to VIN.
FAST LOGIC PIN FOR PWM DIMMING
The DIM pin is a TTL compatible input for PWM dimming of the LED. A logic low (below 0.8V) at DIM will disable
the internal MOSFET and shut off the current flow to the LED array. While the DIM pin is in a logic low state the
support circuitry (driver, bandgap, VCC) remains active in order to minimize the time needed to turn the LED
array back on when the DIM pin sees a logic high (above 2.2V). A 75 µA (typical) pull-up current ensures that the
LM3406/06HV is on when DIM pin is open circuited, eliminating the need for a pull-up resistor. Dimming
frequency, fDIM, and duty cycle, DDIM, are limited by the LED current rise time and fall time and the delay from
activation of the DIM pin to the response of the internal power MOSFET. In general, fDIM should be at least one
order of magnitude lower than the steady state switching frequency in order to prevent aliasing.
INPUT VOLTAGE COMPARATOR FOR PWM DIMMING
Adding an external input diode and using the internal VINS comparator allows the LM3406/06HV to sense and
respond to dimming that is done by PWM of the input voltage. This method is also referred to as "Two-Wire
Dimming", and a typical application circuit is shown in Figure 13. If the VINS pin voltage falls 70% below the VIN
pin voltage, the LM3406/06HV disables the internal power FET and shuts off the current to the LED array. The
support circuitry (driver, bandgap, VCC) remains active in order to minimize the time needed to the turn the LED
back on when the VINS pin voltage rises and exceeds 70% of VIN. This minimizes the response time needed to
turn the LED array back on.
10
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