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TPS61236PRWLT Datasheet(PDF) 10 Page - Texas Instruments

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Part # TPS61236PRWLT
Description  TPS6123x 8-A Valley Current Synchronous Boost Converters with Constant Current Output Feature
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS61236PRWLT Datasheet(HTML) 10 Page - Texas Instruments

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PWM mode at heavy load
PFM mode at light load
Output Voltage
t
VOUT_NOM
VOUT_PFM
one PFM cycle
Inductor
Current
IVALLEY
ton
fsw
IPEAK
(loop controlled)
¨,L
10
TPS61235P, TPS61236P
SLVSCK4A – SEPTEMBER 2015 – REVISED MAY 2016
www.ti.com
Product Folder Links: TPS61235P TPS61236P
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Copyright © 2015–2016, Texas Instruments Incorporated
8.3 Feature Description
8.3.1 Boost Controller Operation
The TPS6123x synchronous boost converter typically operates at a quasi-constant 1-MHz frequency Pulse Width
Modulation (PWM) at moderate to heavy load, which allows the use of small inductors and capacitors to achieve
a small solution size. At light load, it operates in power-save mode with Pulse Frequency Modulation (PFM) for
improved efficiency.
During PWM operation, the converter uses a quasi-constant on-time valley current mode control scheme to
achieve excellent line/load regulation. Based on the VIN /VOUT ratio, a simple circuit predicts the required on-time.
At the beginning of the switching cycle, the low-side NMOS switch is turned on and the inductor current ramps up
to a peak current that is determined by the on-time and the inductance. Once the on-time has expired, the low-
side switch is turned off and the rectifying NMOS switch is turned on. The inductor current decays until reaching
the valley current threshold which is determined by internal control loops. Once this occurs, the on-time is set
again to turn the low-side switch back on and the cycle is repeated. Internal loop compensation is implemented
to simplify the design process while minimizing the number of external components. A bootstrap circuit is built in
to drive the rectifying NMOS switch. Figure 13 illustrates the PWM mode operation.
Figure 13. PWM Mode Operation Illustration
Under a light load condition, the converter works in Pulse Frequency Modulation (PFM) mode. In this mode, the
boost converter switches and ramps up the output voltage until VOUT reaches the PFM threshold. Then it stops
switching and consumes less quiescent current. It resumes switching when the output voltage drops below the
threshold. The converter exits PFM mode when the output current can no longer be supported in this mode.
Refer to Figure 14 for PFM mode operation details.
Figure 14. PFM Mode Operation Illustration
8.3.2 Soft Start
The TPS6123x integrates an internal soft start circuit which controls ramp up of the output voltage and prevents
the converter from inrush current during start-up.
When the device is enabled, the rectifying switch is turned on to charge the output capacitor to the input voltage.
This is called the pre-charge phase. During the phase, the output current is limited to the pre-charge current limit
ILIM_pre, which is proportional to the output voltage. The pre-charge current increases when the output voltage
gets higher.


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