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TPS61160DRVTG4 Datasheet(PDF) 14 Page - Texas Instruments

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Part # TPS61160DRVTG4
Description  White LED Drivers With Digital and PWM Brightness Control in 2-mm x 2-mm WSON Package
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS61160DRVTG4 Datasheet(HTML) 14 Page - Texas Instruments

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background image
VBG
200 mV
Error
Amplifier
FB
CTRL
COMP
14
TPS61160, TPS61161
SLVS791E – NOVEMBER 2007 – REVISED JULY 2016
www.ti.com
Product Folder Links: TPS61160 TPS61161
Submit Documentation Feedback
Copyright © 2007–2016, Texas Instruments Incorporated
Device Functional Modes (continued)
As shown in Figure 13, the device chops up the internal 200-mV 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, TPS61160,
TPS61161 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 5 kHz to 100 kHz. The requirement
of minimum dimming frequency comes from the EasyScale detection delay and detection time specification in the
dimming mode selection. Since the CTRL pin is logic only pin, adding an external RC filter applied to the pin
does not work.
Figure 13. 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 Figure 19.
7.4.3 Digital One-Wire Brightness Dimming
The CTRL pin features a simple digital interface to allow digital brightness control. The digital dimming can save
the processor power and battery life as it does not require a PWM signal all the time, and the processor can
enter idle mode if available.
The TPS61160 or TPS61161 adopts the EasyScale protocol for the digital dimming, which can program the FB
voltage to any of the 32 steps with single command. The step increment increases with the voltage to produce
pseudo logarithmic curve for the brightness step. See the Table 1 for the FB pin voltage steps. The default step
is full scale when the device is first enabled (VFB = 200 mV). The programmed reference voltage is stored in an
internal register. A power reset clears the register value and reset it to default.
Do not use EasyScale to change the feedback voltage from 0 mV, effectively disabling the device, to any other
voltage. One alternative is to start with VFB = 10 mV and go to a higher voltage. Another alternative is to disable
the device by taking the CTRL pin low for 2.5 ms and then re-enter EasyScale to force a soft start from VFB = 0
mV to the default 200 mV.


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