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TPS61165 Fiches technique(PDF) 8 Page - Texas Instruments

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No de pièce TPS61165
Description  High Brightness White LED Driver in 2mm x 2mm QFN Package
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

TPS61165 Fiches technique(HTML) 8 Page - Texas Instruments

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DETAILED DESCRIPTION
OPERATION
SOFT START-UP
OPEN LED PROTECTION
SHUTDOWN
CURRENT PROGRAM
I
LED +
V
FB
R
SET
(1)
TPS61165
SLVS790 – NOVEMBER 2007
The TPS61165 is a high efficiency, high output voltage boost converter in small package size, The device is ideal
for driving up to 10 white LED in series. The serial LED connection provides even illumination by sourcing the
same output current through all LEDs, eliminating the need for expensive factory calibration. The device
integrates 40V/1.2A switch FET and operates in pulse width modulation (PWM) with 1.2MHz fixed switching
frequency. For operation see the block diagram. The duty cycle of the converter is set by the error amplifier
output and the current signal applied to the PWM control comparator. The control architecture is based on
traditional current-mode control; therefore, a slope compensation is added to the current signal to allow stable
operation for duty cycles larger than 40%. The feedback loop regulates the FB pin to a low reference voltage
(200mV typical), reducing the power dissipation in the current sense resistor.
Soft-start circuitry is integrated into the IC to avoid a high inrush current during start-up. After the device is
enabled, the voltage at FB pin ramps up to the reference voltage in 32 steps, each step takes 213
µs. This
ensures that the output voltage rises slowly to reduce the input current. Additionally, for the first 5msec after the
COMP voltage ramps, the current limit of the switch is set to half of the normal current limit spec. During this
period, the input current is kept below 700mA (typical). These two features ensure smooth start-up and minimize
the inrush current. See the start-up waveform of a typical example (Figure 10).
Open LED protection circuitry prevents IC damage as the result of white LED disconnection. The TPS61165
monitors the voltage at the SW pin and FB pin during each switching cycle. The circuitry turns off the switch FET
and shuts down the IC as soon as the SW voltage exceeds the Vovp threshold, and the FB voltage is less than
half of regulation voltage for 8 clock cycles. As a result, the output voltage falls to the level of the input supply.
The device remains in shutdown mode until it is enabled by toggling the CTRL pin logic. To allow the use of
inexpensive low-voltage output capacitor, the TPS61165 has different open lamp protection thresholds to prevent
the internal 40V FET from breaking down. The threshold is set at 38V.
The TPS61165 enters shutdown mode when the CTRL voltage is logic low for more than 2.5ms. During
shutdown, the input supply current for the device is less than 1
µA (max). Although the internal FET does not
switch in shutdown, there is still a DC current path between the input and the LEDs through the inductor and
Schottky diode. The minimum forward voltage of the LED array must exceed the maximum input voltage to
ensure that the LEDs remain off in shutdown.
The FB voltage is regulated by a low 0.2V reference voltage. The LED current is programmed externally using a
current-sense resistor in series with the LED string. The value of the RSET is calculated using Equation 1 .
Where:
ILED = output current of LEDs
VFB = regulated voltage of FB
RSET = current sense resistor
The output current tolerance depends on the FB accuracy and the current sensor resistor accuracy.
8
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Copyright © 2007, Texas Instruments Incorporated
Product Folder Link(s): TPS61165


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