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TPS61160DRVTG4 Datasheet(PDF) 14 Page - Texas Instruments |
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TPS61160DRVTG4 Datasheet(HTML) 14 Page - Texas Instruments |
14 / 39 page ![]() 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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