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TPS61165DRVT Datasheet(PDF) 9 Page - Texas Instruments |
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TPS61165DRVT Datasheet(HTML) 9 Page - Texas Instruments |
9 / 33 page 9 TPS61165 www.ti.com SLVS790D – NOVEMBER 2007 – REVISED APRIL 2016 Product Folder Links: TPS61165 Submit Documentation Feedback Copyright © 2007–2016, Texas Instruments Incorporated 8.3 Feature Description 8.3.1 Soft Start-Up Soft-start circuitry is integrated into the device 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 5 msec after the COMP voltage ramps, the current limit of the switch is set to half of the normal current limit specification. During this period, the input current is kept below 700 mA (typical). These two features ensure smooth start-up and minimize the inrush current (see Figure 6). 8.3.2 Open LED Protection Open LED protection circuitry prevents device 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 device when both of the following conditions persist for 8 switching clock cycles: (1) the SW voltage exceeds the VOVP threshold, and (2) the FB voltage is less than half of regulation voltage. 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. The product of the number of external series LEDs and the maximum forward voltage of each LED plus the 200-mV reference voltage does not exceed the 38-V minimum OVP threshold (NLEDS × VLED(MAX)) + 200 mV ≤ 38 V. 8.3.3 Undervoltage Lockout An undervoltage lockout prevents operation of the device at input voltages below typical 2.2 V. 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 device restarts. 8.3.4 Thermal Shutdown 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. 8.4 Device Functional Modes 8.4.1 Shutdown The TPS61165 device enters shutdown mode when the CTRL voltage is logic low for more than 2.5 ms. During shutdown, the input supply current for the device is less than 1 μA (maximum). 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. |
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