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TPS54335-1ADRCT Datasheet(PDF) 11 Page - Texas Instruments

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Part # TPS54335-1ADRCT
Description  TPS5433xA 4.5-V to 28-V Input, 3-A Output, Synchronous Step-Down DC-DC Converter
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS54335-1ADRCT Datasheet(HTML) 11 Page - Texas Instruments

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ERROR
AMPLIFIER
Boot
Charge
Current
Sense
Slope
Compensation
Voltage
Reference
VSENSE
SS
(TPS54336A)
COMP
RT
(TPS54335A)
BOOT
GND
Thermal
Hiccup
EN
Enable
Comparator
Shutdown
Logic
Enable
Threshold
EXPOSED THERMAL PAD
Power Stage
and
Deadtime
Control
Logic
OV
Minimum Clamp
Pulse Skip
Ip
Ih
VIN
HS MOSFET
Current
Comparator
Current
Sense
VIN
Boot
UVLO
PH
Hiccup
Shutdown
Hiccup
Shutdown
Oscillator
UVLO
+
+
Overload
Recovery
Maximum
Clamp
Regulator
LS MOSFET
Current-Limit
11
TPS54335A, TPS54335-1A, TPS54336A
www.ti.com
SLVSCD5D – NOVEMBER 2014 – REVISED FEBRUARY 2016
Product Folder Links: TPS54335A TPS54335-1A TPS54336A
Submit Documentation Feedback
Copyright © 2014–2016, Texas Instruments Incorporated
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 Fixed-Frequency PWM Control
The device uses a fixed-frequency, peak current-mode control. The output voltage is compared through external
resistors on the VSENSE pin to an internal voltage reference by an error amplifier which drives the COMP pin.
An internal oscillator initiates the turn on of the high-side power switch. The error amplifier output is compared to
the current of the high-side power switch. When the power-switch current reaches the COMP voltage level the
high-side power switch is turned off and the low-side power switch is turned on. The COMP pin voltage increases
and decreases as the output current increases and decreases. The device implements a current-limit by
clamping the COMP pin voltage to a maximum level and also implements a minimum clamp for improved
transient-response performance.
7.3.2 Light-Load Operation
The device monitors the peak switch current of the high-side MOSFET. When the peak switch current is lower
than 0.5 A (typical), the device stops switching to boost the efficiency until the peak switch current again rises
higher than 0.5 A (typical).


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