VBG

200 mV

Error

Amplifier

FB

CTRL

COMP

11

TPS61160A, TPS61161A

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SLVS937C – MARCH 2009 – REVISED JULY 2016

Product Folder Links: TPS61160A TPS61161A

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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

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.