TPS55010 Datasheet, PDF (1/40 Pages) Texas Instruments – 2.95V To 6V Input, 2W, Isolated DC/DC Converter with Integrated FETs

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TPS55010
SLVSAV0A – APRIL 2011 – REVISED JUNE 2011
2.95V To 6V Input, 2W, Isolated DC/DC Converter with Integrated FETs
Check for Samples: TPS55010
FEATURES
1
•23 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
APPLICATIONS
• 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
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.
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.
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.
The TPS55010 is available in a 3 mm x 3 mm 16 pin
QFN package with thermal pad.
Figure 1. SIMPLIFIED SCHEMATIC
3V
to
5.5 V
C_IN
C_ss
R_t
VIN
BOOT
TPS55010 ^C_boot
PH
EN
FAULT
R_HS
SS _VSENSE
RT/CLK
COMP
R_LS
GND
T1
1:2.5
C_PRI
5V
200mA
+
C_{O VO}
_
C_C
Figure 2. Efficiency vs Load Current
100
90
80
70
60
50
40
30
V_OUT = 5V
20
F_SW = 350kHz
10
0
0.00
0.05
0.10 0.15 0.20
Output Current (A)
V_IN = 5V
0.25 0.30
G040
1
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.
Fly-Buck is a trademark of Texas Instruments.
2
All other trademarks are the property of their respective owners.
3
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