TPS55010_15 Datasheet, PDF (1/46 Pages) Texas Instruments – TPS55010 2.95-V To 6-V Input, 2 W, Isolated DC/DC Converter with Integrated FETs

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TPS55010
SLVSAV0B – APRIL 2011 – REVISED OCTOBER 2014
TPS55010 2.95-V To 6-V Input, 2 W, Isolated DC/DC Converter with Integrated FETs
1 Features
•1 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
2 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
3 Description
The TPS55010 is a transformer driver designed to
provide isolated power for isolated interfaces, such as
RS-485 and RS-232, from 3.3 V or 5 V 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 3mm x 3mm 16 pin
QFN package with thermal pad.
Device Information ⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS55010
WQFN (16)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at he
end of the datasheet.
4 Simplified Schematic
3V
to
5.5 V
C_IN
VIN
BOOT
TPS55010 ^C_boot
T1
1:2.5
5V
200mA
EN
FAULT
PH
R_HS
C_O
+
V_O
_
SS _VSENSE
RT/CLK
C_ss
COMP
R_t R_C
C_PRI
R_LS
GND
C_C
100
90
80
70
60
50
40
30
20
10
0
0.00
Efficiency vs Load Current
0.05
V_OUT = 5V
F_SW = 350kHz
0.10 0.15 0.20
Output Current (A)
V_IN = 5V
0.25 0.30
G040
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.