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PDF TD1501H Data sheet ( Hoja de datos )
| Número de pieza | TD1501H | |
| Descripción | PWM Buck DC/DC Converter | |
| Fabricantes | Techcode | |
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Techcode®
3A 150KHz PWM Buck DC/DC Converter
DATASHEET
TD1501H
General Description
Features
The TD1501H is a series of easy to use fixed and
adjustable step-down (buck) switch-mode voltage
regulators. These devices are available in fixed output
voltage of 5V, and an adjustable output version. Both
versions are capable of driving a 3A 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 80 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 TD1501H is available in TO-263-5L packages.
5V and adjustable output versions
Output adjustable from 1.23v to 57V
Fixed 150KHz frequency internal oscillator
Guaranteed 3A output load current
Input voltage range up to 60V
Low power standby mode, IQ typically 80 µA
TTL shutdown capability
Excellent line and load regulation
Requires only 4 external components
High efficiency
Thermal shutdown and current limit protection
Available in TO-263 packages
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
December, 20, 2010
TO263-5L
Figure 1. Package Types of TD1501H
Techcode Semiconductor Limited
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1 page  
Techcode®
3A 150KHz PWM Buck DC/DC Converter
Electrical Characteristics
DATASHEET
TD1501H
Specifications with boldface type are for full operationg temperature range, the other type are for TJ=25OC.
Note1: Thermal resistance with copper area of approximately 3 in2.
Parameters
Feedback bias current
Quiescent current
Standby quiescent current
Oscillator frequency
Saturation voltage
Current Limit
Output leakage current
Output leakage current
ON/OFF pin logic input
Threshold voltage
ON/OFF pin input current
Thermal Resistance
Junction to Case
Thermal Resistance
Junction to Ambient
(Note1)
Symbol
Ib
IQ
ISTBY
FOSC
VSAT
ICL
IL
IL
VIL
VIH
Test Condition
Adjustable only,
VFB=1.3V
VFB=12V force driver
off
ON/OFF=5V, VIN=36V
IOUT=3A
Peak Current (VFB=0V)
Output=0V (VFB=12V)
Output=-1V (VIN=36V)
Low (Regulator ON)
Min.
127
Typ. Max. Unit
10 50/100 nA
5 10 mA
80 200/250 uA
150 173 KHz
1.2 1.4/1.5 V
4.5 5.5/6.5 A
50 uA
2 30 mA
1.3 0.6
V
IH High (Regulator OFF) 2.0 1.3
IL
V
VLOGIC=2.5V(Regulator
OFF)
5 15 uA
VLOGIC=0.5V(Regulator
ON)
0.02 5
uA
θJC TO263-5L
3.5 OC/W
θJA TO263-5L
23 OC/W
December, 20, 2010
Techcode Semiconductor Limited
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Techcode®
3A 150KHz PWM Buck DC/DC Converter
Function Description
DATASHEET
TD1501H
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.
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 80uA. Pulling this pin
below a threshold voltage of approximately 1.3V turns
the regulator on, and pulling this pin above 1.3V (up to a
maximum of 25V) 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 TD1501H is available in two packages, a 5-pin
TO-220B/TO-220 and a 5-pin surface mount TO-263.
The TO-220B/TO-220 package needs a heat sink under
most conditions. The size of the heatsink depends on
the input voltage, the output voltage, the load current
and the ambient temperature. The TD1501H junction
temperature rises above ambient temperature for a 3A
load and different input and output voltages. The data
for these curves was taken with the TD1501H
(TO-220B/TO-220 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.
The TO-263 surface mount package tab is designed to
be soldered to the copper on a printed circuit board. The
copper and the board are the heat sink for this package
and the other heat producing components, such as the
catch diode and inductor. The PC board copper area that
the package is soldered to should be at least 0.4 in2, and
ideally should have 2 or more square inches of 2 oz.
Additional copper area improves the thermal
characteristics, but with copper areas greater than
approximately 6 in2, only small improvements in heat
dissipation are realized. If further thermal improvements
are needed, double sided, multilayer PC board with large
copper areas and/or airflow are recommended.
The TD1501H (TO-263 package) junction temperature
rise above ambient temperature with a 3A load for
various input and output voltages. This data was taken
with the circuit operating as a buck switching regulator
with all components mounted on a PC board to simulate
the junction temperature under actual operating
conditions. This curve can be used for a quick check for
the approximate junction temperature for various
conditions, but be aware that there are many factors that
can affect the junction temperature. When load
currents higher than 3A are used, double sided or
multilayer PC boards with large copper areas and/or
airflow might be needed, especially for high ambient
temperatures and high output voltages.
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
December, 20, 2010
Techcode Semiconductor Limited
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11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet TD1501H.PDF ] | |
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