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PDF TD1501 Data sheet ( Hoja de datos )
| Número de pieza | TD1501 | |
| Descripción | PWM Buck DC/DC Converter | |
| Fabricantes | Techcode | |
| Logotipo |  |
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Techcode®www.DataSheet.co.kr
3A 150KHz PWM Buck DC/DC Converter
DATASHEET
TD1501
General Description
Features
The TD1501 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 3.3V, 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 TD1501 is available in TO-220B-5L TO220-5L and
TO-263-5L packages.
z 3.3V, 5V and adjustable output versions
z Output adjustable from 1.23v to 43V
z Fixed 150KHz frequency internal oscillator
z Guaranteed 3A output load current
z Input voltage range up to 45V
z Low power standby mode, IQ typically 80 µA
z TTL shutdown capability
z Excellent line and load regulation
z Requires only 4 external components
z High efficiency
z Thermal shutdown and current limit protection
z Available in TO-220B/TO220 and TO-263 packages
Applications
z Simple High-efficiency step-down regulator
z On-card switching regulators
z Positive to negative converter
z LCD monitor and LCD TV
z DVD recorder and PDP TV
z Battery charger
z Step-down to 3.3V for microprocessors
Package Types
TO220B5L TO2205L TO2635L
Figure 1. Package Types of TD1501
December, 20, 2005. Techcode Semiconductor Limited www.techcodesemi.com
1
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
Techcode®www.DataSheet.co.kr
3A 150KHz PWM Buck DC/DC Converter
Electrical Characteristics
DATASHEET
TD1501
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
Symbol
Test Condition
Feedback bias current
Quiescent current
Ib
Adjustable only,
VFB=1.3V
IQ
VFB=12V force driver
off
Standby quiescent current
ISTBY
ON/OFF=5V, VIN=36V
Oscillator frequency
FOSC
Saturation voltage
VSAT
IOUT=3A
Current Limit
Output leakage current
Output leakage current
ON/OFF pin logic input
Threshold voltage
ICL Peak Current (VFB=0V)
IL
IL
Output=0V (VFB=12V)
Output=-1V (VIN=36V)
VIL
VIH
Low (Regulator ON)
Min.
127
Typ.
10
Max.
50/100
Unit
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
ON/OFF pin input current
Thermal Resistance
Junction to Case
Thermal Resistance
Junction to Ambient
(Note1)
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
TO220B-5L/TO220-5L
TO263-5L
2.5
3.5
OC/W
θJA
TO220B-5L/TO220-5L
TO263-5L
28
23
OC/W
December, 20, 2005. Techcode Semiconductor Limited www.techcodesemi.com
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5 Page 
Techcode®www.DataSheet.co.kr
3A 150KHz PWM Buck DC/DC Converter
Function Description
DATASHEET
TD1501
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 TD1501 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 TD1501 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 TD1501
(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 TD1501 (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, 2005. Techcode Semiconductor Limited www.techcodesemi.com
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| PDF Descargar | [ Datasheet TD1501.PDF ] | |
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