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TPS61161A Datasheet(PDF) 11 Page - Texas Instruments |
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TPS61161A Datasheet(HTML) 11 Page - Texas Instruments |
11 / 31 page VBG 200 mV Error Amplifier FB CTRL COMP 11 TPS61160A, TPS61161A www.ti.com SLVS937C – MARCH 2009 – REVISED JULY 2016 Product Folder Links: TPS61160A TPS61161A Submit Documentation Feedback Copyright © 2009–2016, Texas Instruments Incorporated Feature Description (continued) Figure 11. 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 15). 7.3.6 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 IC restarts. 7.3.7 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. 7.4 Device Functional Modes 7.4.1 Operation with CTRL When the CTRL pin is held below the VIL threshold, the device is disabled, and switching is inhibited. The IC quiescent current is reduced in this state. When VIN is above the UVLO threshold, and the CTRL terminal is increased above the VIH threshold the soft-start sequence initiates then the device becomes active. 7.4.2 External PWM Dimming For assistance in selecting the proper values for Rset, R1-R3, RFLTR, CFLTR and D2 for the specific application, refer to How to Use Analog Dimming With the TPS6116x (SLVA471) and/or Design Tool for Analog Dimming Using a PWM Signal (http://www.ti.com/lit/zip/slvc366). Also see Choosing Component Values section below. |
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