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PDF TD1509 Data sheet ( Hoja de datos )
| Número de pieza | TD1509 | |
| Descripción | 2A 150KHZ PWM Buck DC/DC Converter | |
| Fabricantes | Techcode Semiconductor | |
| Logotipo |  |
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Datasheet
2A 150KHZ PWM Buck DC/DC Converter
TD1509
General Description
Features
The TD1509 is a of easy to use adjustable
step-down (buck) switch-mode voltage regulator.
The device is available in an adjustable output
version. It is capable of driving a 2A load with
excellent line and load regulation.
Requiring a minimum number of external
components, these regulators are simple to use
and include internal frequency compensation, and
a fixed-frequency oscillator.
The output voltage is guaranteed to ±3%
tolerance under specified input voltage and
output load conditions. The oscillator frequency is
guaranteed to ±15%. External shutdown is
included, featuring typically 50 µA standby current.
Self protection features include a two stage
frequency reducing current limit for the output
switch and an over temperature shutdown for
complete protection under fault conditions.
The TD1509 is available in SOP8 DIP8 package.
• 3,3V,5V and Adjustable output versions
• Output adjustable from 1.23v to 43V
• Fixed 150KHz frequency internal oscillator
• Guaranteed 2A output load current
• Input voltage range up to 45V
• Low power standby mode, IQ typically 50 µA
• TTL shutdown capability
• Excellent line and load regulation
• High efficiency
• Thermal shutdown and current limit protection
• Available in advantaged SOP8 DIP8 package
Applications
• Simple High-efficiency step-down regulator
• On-card switching regulators
• Positive to negative converter
• LCD monitor and LCD TV
• DVD recorder and PDP TV
• Battery charger
• Step-down to 3.3V for microprocessors
Package Types
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SOP8
DIP8
Figure 1. Package Types of TD1509
December, 20, 2005.
Techcode Semiconductor Limited
1
1 page  
Datasheet
2A 150KHZ PWM Buck DC/DC Converter
TD1509
Absolute Maximum Ratings
Note1: Stresses greater than those listed under Maximum Ratings may cause permanent damage to the
device. This is a stress rating only and functional operation of the device at these or any other conditions
above those indicated in the operation is not implied. Exposure to absolute maximum rating conditions
for extended periods may affect reliability.
Parameter
Supply Voltage Vin
Feedback VFB pin voltage
ON/OFF Pin voltage
Output pin voltage
Output Voltage to Ground (Steady State)
Power Dissipation
Operating Temperature Range
Storage Temperature
Lead Temperature (Soldering, 10 sec)
ESD(HM)
Thermal Resistance-Junction to Ambient(RθJA)
Thermal Resistance-Junction to Case(RθJC)
Value
-0.3 to 45
-0.3 to Vin+0.3
-0.3 to Vin+0.3
-0.3 to Vin+0.3
-1
Internally limited
-40 to +125
-65 to +150
260
2000
85
45
Unit
V
V
V
V
V
W
ºC
ºC
ºC
V
ºC / W
ºC / W
www.DaEtaSlehecett4rUi.ccoaml Characteristics
Unless otherwise specified, Vin = 12V. Iload = 0.5A, Ta = 25℃.
Symbol
Parameter
Ib
IQ
ISTBY
FOSC
VSAT
ICL
IL
IL
Feedback bias current
Quiescent current
Standby quiescent current
Oscillator frequency
Saturation voltage
Current Limit
Output leakage current
Output leakage current
Conditions
VFB=1.3V
VFB=12V force driver off
ON/OFF=5V, VIN=36V
IOUT=2A
Peak Current (VFB=0V)
Output=0V (VFB=12V)
Output=-1V (VIN=32V)
Min.
127
Typ. Max.
10 50/100
5 10
50 100
150 173
1.10 1.3
3.8
50
2 30
Uni
t
nA
mA
uA
KHz
V
A
uA
mA
December, 20, 2005.
Techcode Semiconductor Limited
5
5 Page 
Datasheet
2A 150KHZ PWM Buck DC/DC Converter
TD1509
Function Description
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
Ground
Circuit ground.
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.
Output
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.
Feedback
Senses the regulated output voltage to complete
the feedback loop.
ON/OFF
Allows the switching regulator circuit to be
shutdown using logic level signals thus dropping
the total input supply current to approximately
50uA. Pulling this pin below a threshold voltage of
www.DaaptapuSplhlirenoegxt4iUtmh.ciasotmeplyin
1.3V turns the regulator on, and
above 1.3V (up to a maximum of
32V) shuts the regulator down. If this shutdown
feature is not needed, the ON /OFF pin can be
wired to the ground pin or it can be left open, in
either case the regulator will be in the ON
condition.
Thermal Considerations
The TD1509 is available in SOP8/DIP8 package.
The SOP8/DIP8 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 TD1509 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 TD1509 (SOP8/DIP8
package) operating as a buck-switching regulator
in an ambient temperature of 25oC (still air).
These temperature rise numbers are all
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
output voltage down by the ratio:
VFB = VOUT * R1 / (R1 + R2)
Thus the output voltage is:
VOUT = 1.235 * (R1 + R2) / R1
R1 can be as high as 100KΩ, but a typical
value is 10KΩ. Using that value, R2 is
determined by:
R2 ~= 8.1 * (VOUT – 1.235) (KΩ)
Inductor
The inductor is required to supply constant
current to the output load while being driven by
December, 20, 2005.
Techcode Semiconductor Limited
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet TD1509.PDF ] | |
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