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TPS61160A Fiches technique(PDF) 9 Page - Texas Instruments

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No de pièce TPS61160A
Description  White LED Driver With PWM Brightness Control in 2mm x 2mm QFN Package for up to 10 LEDs in Series
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

TPS61160A Fiches technique(HTML) 9 Page - Texas Instruments

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PWM BRIGHTNESS DIMMING
V
FB + Duty
200 mV
(2)
VBG
200mV
Error
Amplifier
FB
CTRL
UNDERVOLTAGE LOCKOUT
THERMAL SHUTDOWN
TPS61160A
TPS61161A
www.ti.com................................................................................................................................................................................................... SLVS937 – MARCH 2009
When the CTRL pin is constantly high, the FB voltage is regulated to 200mV typically. However, the CTRL pin
allows a PWM signal to reduce this regulation voltage; therefore, it achieves LED brightness dimming. The
relationship between the duty cycle and FB voltage is given by Equation 2.
Where
Duty = duty cycle of the PWM signal
200 mV = internal reference voltage
As shown in Figure 12, the IC chops up the internal 200mV reference voltage at the duty cycle of the PWM
signal. The pulse signal is then filtered by an internal low pass filter. The output of the filter is connected to the
error amplifier as the reference voltage for the FB pin regulation. Therefore, although a PWM signal is used for
brightness dimming, only the WLED DC current is modulated, which is often referred as analog dimming. This
eliminates the audible noise which often occurs when the LED current is pulsed in replica of the frequency and
duty cycle of PWM control. Unlike other scheme which filters the PWM signal for analog dimming,
TPS61160A/61A regulation voltage is independent of the PWM logic voltage level which often has large
variations.
For optimum performance, use the PWM dimming frequency in the range of 5kHz to 100kHz. The requirement of
minimum dimming frequency comes from the output ripple. Low frequency causes high output ripple. Since the
CTRL pin is logic only pin, applying an external RC filter to the pin does not work.
Figure 12. Block Diagram of Programmable FB Voltage Using PWM Signal
To use lower PWM dimming, add an external RC network connected to the FB pin as shown in the additional
typical application (Figure 15).
An undervoltage lockout prevents operation of the device at input voltages below typical 2.2V. When the input
voltage is below the undervoltage threshold, the device is shutdown and the internal switch FET is turned off. If
the input voltage rises by undervoltage lockout hysteresis, the IC restarts.
An internal thermal shutdown turns off the device when the typical junction temperature of 160°C is exceeded.
The device is released from shutdown automatically when the junction temperature decreases by 15°C.
Copyright © 2009, Texas Instruments Incorporated
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