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TPS61163AYFFR Datasheet(PDF) 9 Page - Texas Instruments

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Part # TPS61163AYFFR
Description  TPS6116xA Dual-Channel WLED Drivers For Smart Phones
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS61163AYFFR Datasheet(HTML) 9 Page - Texas Instruments

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TPS61162A, TPS61163A
www.ti.com
SLVSC26A – NOVEMBER 2013 – REVISED JUNE 2015
7.3 Feature Description
7.3.1 Boost Converter
The boost converter of the TPS61162A, TPS61163A integrates a 1.5-A, 40-V low-side switch MOSFET and has
a fixed switching frequency of 1.2 MHz. The control architecture is based on traditional current-mode Pulse Width
Modulation (PWM) control. For operation see the Functional Block Diagram. Two current sinks regulate the dual-
channel current, and the boost output is automatically set by regulating voltage on the IFBx pin. The output of
error amplifier and the sensed current of switch MOSFET are applied to a control comparator to generate the
boost switching duty cycle; slope compensation is added to the current signal to allow stable operation for duty
cycles larger than 50%.
The forward voltages of two LED strings are normally different due to the LED diode forward voltage
inconsistency; thus, the IFB1 and IFB2 voltages are normally different. The TPS61162A, TPS61163A can select
out the IFBx pin which has a lower voltage than the other and regulate its voltage to a very low value (90 mV
typical), which is enough for the two current sinks' headroom. In this way, the output voltage of the boost
converter is automatically set and adaptive to LED strings' forward voltages, and the power dissipation of the
current sink regulators can be reduced remarkably with this very low headroom voltage.
In order to improve the boost efficiency at light load, Pulse Frequency Modulation (PFM) mode is automatically
enabled under light load conditions. When the load current decreases along with the dimming duty, the output of
gm amplifier — COMP pin voltage decreases until it is clamped at an internal reference voltage. Because COMP
pin voltage controls the inductor peak current, when it is clamped the inductor peak current is also clamped and
cannot decrease. As a result, more energy than needed is transferred to the output stage, and the output voltage
and IFBx pin voltage increase. An internal hysteresis comparator detects the minimum IFBx pin voltage. When
the minimum IFBx voltage is detected as higher than the regulation voltage 90 mV by around 120 mV, the boost
stops switching. Then the output voltage, as well as IFBx pin voltage, decrease. When the minimum IFBx voltage
is lower than the hysteresis (around 40 mV), the boost switches again. Thus, during PFM mode the boost output
trips between the low and high thresholds. When the load increases along with the dimming duty, the COMP pin
voltage will exit from the clamped status, and the boost will exit the PFM mode and return to the PWM operation,
during which the minimum IFBx pin voltage is regulated at 90 mV again. Refer to Figure 23 and Figure 24 for
PFM mode operation.
7.3.2 IFBx Pin Unused
If only one channel is needed, a user can easily disable the unused channel by connecting its IFBx pin to
ground. If both IFBx pins are connected to ground, the device will not start up.
7.3.3 Enable and Start-up
In order to enable the device from shutdown mode, three conditions have to be met:
1. POR (Power On Reset, that is, VIN voltage is higher than UVLO threshold);
2. Logic high on EN pin; and
3. PWM signal (logic high or PWM pulses) on PWM pin.
When these conditions are all met, an internal LDO linear regulator is enabled to provide supply to internal
circuits and the device can start up.
The TPS61162A, TPS61163A support two dimming interfaces: one-wire digital interface (EasyScale interface)
and PWM interface. TPS61162A, TPS61163A begin an EasyScale detection window after start-up to detect
which interface is selected. If the EasyScale interface is needed, signals of a specific pattern should be input into
EN pin during the EasyScale detection window; otherwise, PWM dimming interface will be enabled (see details in
One-Wire Digital Interface (EasyScale Interface)).
After the EasyScale detection window, the TPS61162A, TPS61163A check the status of IFBx pins. If one IFBx
pin is detected to connect to ground, the corresponding channel will be disabled and removed from the control
loop. Then the soft-start begins, and the boost converter starts switching. If both IFBx pins are shorted to ground,
the TPS61162A, TPS61163A will not start up.
Either pulling EN pin low for more than 2.5 ms or pulling PWM pin low for more than 20 ms can disable the
device, and the TPS61162A, TPS61163A enters into shutdown mode.
Copyright © 2013–2015, Texas Instruments Incorporated
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Product Folder Links: TPS61162A TPS61163A


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