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PDF TD1591 Data sheet ( Hoja de datos )
| Número de pieza | TD1591 | |
| Descripción | 2A 380KHz 32V PWM Buck DC/DC Converter | |
| Fabricantes | Techcode | |
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T echcode®
2A 380KHz 32V PWM Buck DC/DC Converter
DATASHEET
TD1591
General Description
Features
The TD1591 is a 380 KHz fixed frequency monolithic
step down switch mode regulator with a built in internal
Power MOSFET. It achieves 2A continuous output
current over a wide input supply range with excellent
load and line regulation.
The device includes a voltage reference, oscillation
circuit, error amplifier, internal PMOS and etc.
The PWM control circuit is able to adjust the duty ratio
linearly from 0 to 100%. An enable function, an over
current protection function and a short circuit protection
function are built inside. An internal compensation block
is built in to minimize external component count.
z 2A Constant Output Current
z 80mΩ RDSON Internal Power PMOSFET Switch
z Up to 95% Efficiency
z Fixed 380KHz Frequency
z Wide 3.6V to32V Input Voltage Range
z Output Adjustable from 1.222V to 30V
z Built in Frequency Compensation
z Built in Thermal Shutdown Function
z Built in Current Limit Function
z SOP-8 Package is Available
z The minimum dropout up to 0.3V
The TD1591 serves as ideal power supply units for Applications
portable devices.
z Portable DVD
z LCD Monitor / TV
z Battery Charger
z ADSL Modem
z Telecom / Networking Equipment
Package Types
Figure 1. Package Types of TD1591
December, 23, 2009. Techcode Semiconductor Limited www.techcodesemi.com
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1 page  
T echcode®
2A 380KHz 32V PWM Buck DC/DC Converter
Electrical Characteristics
DATASHEET
TD1591
VCC = 12V, Ta = 25℃ unless otherwise specified.
Parameters
Input voltage
Shutdown Supply Current
Supply Current
Feedback Voltage
Feedback Bias Current
Switch Current Limit
Oscillator Frequency
Frequency of Current Limit or
Short Circuit Protection
EN Pin Threshold
EN Pin Input Leakage Current
Internal PMOS RDSON
Max. Duty Cycle
Efficiency
Thermal Shutdown
Symbol
VIN
ISTBY
ICC
VFB
IFB
ILIM
FOSC
FOSC1
VEN
IH
IL
RDSON
DMAX
η
TOTSD
Test Condition
VEN=0V
VEN=2V, VFB=1.3V
VIN = 3.6V to 28V
VFB=1.3V
VFB=0V
VIN =12V, VFB=0V
VEN=2.5V
VEN=0.5V
VIN =12V, VFB=0V
VEN=12V, Iout=2A
VFB=0V, ISW=0.1A
VIN=12V ,Vout=5V
Iout=2A
Min.
3.6
Typ.
30
Max.
32
90
3.6 4
1.185 1.222
0.1
3
1.26
0.5
4
320 380 440
Unit
V
uA
mA
V
uA
A
KHz
42 KHz
0.7 1.2 1.7
-0.1 -1
-3 -10
80
V
uA
uA
mΩ
100 %
- 92 -
165
%
ºC
December, 23, 2009. Techcode Semiconductor Limited www.techcodesemi.com
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T echcode®
2A 380KHz 32V PWM Buck DC/DC Converter
Function Description
DATASHEET
TD1591
Pin Functions
VIN
This is the positive input supply for the IC switching
regulator. A suitable input bypass capacitor must be
present at this pin to minimize voltage transients and to
supply the switching currents needed by the regulator
Gnd
Circuit ground.
SW
Internal switch. The voltage at this pin switches between
(VIN – VSAT) and approximately – 0.5V, with a duty cycle
of approximately VOUT / VIN. To minimize coupling to
sensitive circuitry, the PC board copper area connected
to this pin should be kept a minimum.
FB
Senses the regulated output voltage to complete the
feedback loop.
EN
Allows the switching regulator circuit to be shutdown
using logic level signals thus dropping the total input
supply current to approximately 30uA. Pulling this pin
below a threshold voltage of approximately 0.7 V turns
the regulator down, and pulling this pin above 1.3V (up
to a maximum of 12V) shuts the regulator on. For
automatic starup condition , can be implemented by the
addition of a resistive voltage divider from VIN to GND.
Thermal Considerations
The TD1591 is available in SOP8 package.
The SOP8 package needs a heat sink under most
conditions. The size of the heat sink depends on the
input voltage, the output voltage, the load current and the
ambient temperature. The TD1591 junction temperature
rises above ambient temperature for a 2A load and
different input and output voltages. The data for these
curves was taken with the TD1591 (SOP8 package)
operating as a buck-switching regulator in an ambient
temperature of 25oC (still air). These temperature rise
numbers are all approximate and there are many factors
that can affect these temperatures. Higher ambient
temperatures require more heat sinking.
For the best thermal performance, wide copper traces
and generous amounts of printed circuit board copper
should be used in the board layout. (Once exception to
this is the output (switch) pin, which should not have
large areas of copper.) Large areas of copper provide the
best transfer of heat (lower thermal resistance) to the
surrounding air, and moving air lowers the thermal
resistance even further.
Package thermal resistance and junction temperature
rise numbers are all approximate, and there are many
factors that will affect these numbers. Some of these
factors include board size, shape, thickness, position,
location, and even board temperature. Other factors are,
trace width, total printed circuit copper area, copper
thickness, single or double-sided, multi-layer board and
the amount of solder on the board.
The effectiveness of the PC board to dissipate heat also
depends on the size, quantity and spacing of other
components on the board, as well as whether the
surrounding air is still or moving. Furthermore, some of
these components such as the catch diode will add heat
to the PC board and the heat can vary as the input
voltage changes. For the inductor, depending on the
physical size, type of core material and the DC
resistance, it could either act as a heat sink taking heat
away from the board, or it could add heat to the board.
Setting the Output Voltage
The output voltage is set using a resistive
voltage divider from the output voltage to FB. The
voltage divider divides the
December, 23, 2009. Techcode Semiconductor Limited www.techcodesemi.com
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| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet TD1591.PDF ] | |
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