TPS55010
www.ti.com
SLVSAV0A –APRIL 2011–REVISED JUNE 2011
2.95V To 6V Input, 2W, Isolated DC/DC Converter with Integrated FETs
Check for Samples: TPS55010
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FEATURES
DESCRIPTION
The TPS55010 is a transformer driver designed to
provide isolated power for isolated interfaces, such as
RS-485 and RS-232, from 3.3V or 5V input supply.
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Isolated Fly-Buck™ Topology
Primary Side Feedback
100 kHz to 2000 kHz Switching Frequency
Synchronizes to External Clock
Adjustable Slow Start
Adjustable Input Voltage UVLO
Open Drain Fault Output
Cycle-by-Cycle Current Limit
Thermal Shutdown Protection
3 mm x 3 mm 16 Pin QFN Package
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The device uses fixed frequency current mode control
and half bridge power stage with primary side
feedback to regulate the output voltage for power
levels up to 2W. The switching frequency is
adjustable from 100 kHz to 2000 kHz so solution size,
efficiency and noise can be optimized. The switching
frequency is set with a resistor or is synchronized to
external clock using the RT/CLK pin. To minimize
inrush currents, a small capacitor can be connected
to the SS pin. The EN pin can be used as an enable
pin or to increase the default input UVLO voltage
from 2.6V.
APPLICATIONS
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Noise Immunity in PLCs, Data Acquisition and
Measurement Equipment
Isolated RS-232 and RS-485 Communication
Channels
Powers Line Drivers, ISO Amplifiers, Sensors,
CAN Transceivers
Floating Supplies for IGBT Gate Drivers
Promotes Safety in Medical Equipment
With the same transformer the TPS55010 can
provide a solution for different input and output
voltage combinations by adjusting the primary side
voltage. Off the shelf transformers are available to
provide single positive, or dual positive and negative
output voltages.
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The TPS55010 is available in a 3 mm x 3 mm 16 pin
QFN package with thermal pad.
Figure 1. SIMPLIFIED SCHEMATIC
Figure 2. Efficiency vs Load Current
3 V
100
90
80
70
60
50
40
to
5.5 V
C
VIN
BOOT
5 V
200mA
T1
1:2.5
C
TPS55010
boot
R
IN
PH
+
C
O
EN
V
O
FAULT
SS
HS
_
VSENSE
GND
RT/CLK
COMP
30
20
10
0
VOUT = 5V
C
PRI
C
FSW = 350kHz
ss
R
R
LS
t
VIN = 5V
C
0.00
0.05
0.10
0.15
0.20
0.25
0.30
C
Output Current (A)
G040
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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Fly-Buck is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2011, Texas Instruments Incorporated