TD1507 [ETC]
2.5A 150KHZ PWM Buck DC/DC Converter; 2.5A 150KHZ的PWM降压型DC / DC转换器
| 型号： | TD1507 |
| 厂家： | 
ETC |
| 描述： | 2.5A 150KHZ PWM Buck DC/DC Converter |
| 文件： | 总11页 (文件大小：381K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Datasheet
TD1507
2.5A 150KHZ PWM Buck DC/DC Converter
General Description
Features
The TD1507 is a easy to use adjustable
step-down (buck) switch-mode voltage regulators.
The device is available in an adjustable output
version. It is capable of driving a 2.5A load with
excellent line and load regulation.
• Adjustable output version
• Output adjustable from 1.23v to 34V
• Fixed 150KHz frequency internal oscillator
• Guaranteed 2.5A output load current
• Input voltage range up to 36V
• Low power standby mode, IQ typically 70 µA
• TTL shutdown capability
Requiring
a
minimum number of external
components, the regulator is simple to use and
include internal frequency compensation, and a
fixed-frequency oscillator.
• Excellent line and load regulation
• High efficiency
• Thermal shutdown and current limit protection
• Available in TO252-5L package
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.
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
The TD1507 is available in TO252-5L package.
Package Types
TO252-5L
Figure 1. Package Types of TD1507
October, 20, 2005.
Techcode Semiconductor Limited
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Datasheet
TD1507
2.5A 150KHZ PWM Buck DC/DC Converter
Pin Descriptions
Pin Assignments
Name
Vin
Description
Input supply voltage
Switching output
Ground
5 ON/OFF
4 Feedback
3 Gnd
2 Output
1 Vin
Output
Gnd
Feedback
ON/OFF
Output voltage feedback
TO252-5L
ON/OFF shutdown
Active is “Low” or floating
Ordering Information
X
TD1507
X
Packing
Blank: Tube
R: Tape and Reel
Circuit Type
Package
T: TO252-5L
October, 20, 2005.
Techcode Semiconductor Limited
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Datasheet
TD1507
2.5A 150KHZ PWM Buck DC/DC Converter
Functional Block Diagram
Figure 2. Functional Block Diagram of TD1507
Typical Application
Figure 3. Typical Application of TD1507
October, 20, 2005.
Techcode Semiconductor Limited
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Datasheet
TD1507
2.5A 150KHZ PWM Buck DC/DC Converter
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
Value
-0.3 to 40
-0.3 to Vin+0.3
-0.3 to Vin+0.3
-0.3 to Vin+0.3
-1
Unit
V
Supply Voltage Vin
Feedback VFB pin voltage
ON/OFF Pin voltage
V
V
Output pin voltage
V
Output Voltage to Ground (Steady State)
Power Dissipation
V
Internally limited
-40 to +125
-65 to +150
200
W
ºC
ºC
ºC
V
Operating Temperature Range
Storage Temperature
Lead Temperature (Soldering, 10 sec)
ESD(HM)
2000
Electrical Characteristics
Unless otherwise specified, Vin = 12V. Iload = 0.5A, Ta = 25℃.
Symbol
Ib
Parameter
Conditions
VFB=1.3V
Min.
Typ.
10
Max.
Unit
Feedback bias current
Quiescent current
50/100 nA
IQ
VFB=12V force driver off
ON/OFF=5V, VIN=36V
5
10
mA
uA
KHz
V
Standby quiescent current
Oscillator frequency
Saturation voltage
Current Limit
ISTBY
FOSC
VSAT
ICL
70
150
173
127
150
IOUT=2A
1.10 1.4/1.5
Peak Current (VFB=0V)
Output=0V (VFB=12V)
Output=-1V (VIN=36V)
Low (Regulator ON)
High (Regulator OFF)
VLOGIC=2.5V(Regulator OFF)
4.5
5.5/6.5
50
A
Output leakage current
Output leakage current
uA
mA
V
IL
IL
2
30
1.3
1.3
5
0.6
VIL
VIH
ON/OFF pin logic input
Threshold voltage
2.0
V
ON/OFF pin input current
IH
15
uA
October, 20, 2005.
Techcode Semiconductor Limited
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Datasheet
TD1507
2.5A 150KHZ PWM Buck DC/DC Converter
IL
VLOGIC=0.5V(Regulator ON)
0.02
10
5
uA
Thermal Resistance
OC/W
TO252-5L
TO252-5L
θJC
θJA
Junction to Case
Thermal Resistance
Junction to Ambient
(Note1)
OC/W
50
11V≤VIN≤36V, 0.2A≤ILOAD
≤
1.193/
1.180
1.267/
1.280
V
Vfb: Output Voltage
1.23
88
TD1507
ADJ
3A, VOUT for 9V
%
VIN=12V,VOUT=9V,ILOAD=3A
η: Efficiency
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.
October, 20, 2005.
Techcode Semiconductor Limited
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Datasheet
TD1507
2.5A 150KHZ PWM Buck DC/DC Converter
Typical Performance Characteristics
Figure 4. Output Voltage vs. Temperature
Figure 5. Switching Frequency vs. Temperature
Figure 6. Output Saturation Characteristics
Figure 7. Quiescent Current vs. Temperature
October, 20, 2005.
Techcode Semiconductor Limited
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Datasheet
TD1507
2.5A 150KHZ PWM Buck DC/DC Converter
Figure 8. ON/OFF Pin Voltage
Figure 9. ON/OFF Pin Sink Current
Figure 10. Output Saturation Characteristics
October, 20, 2005.
Techcode Semiconductor Limited
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Datasheet
TD1507
2.5A 150KHZ PWM Buck DC/DC Converter
Typical Application Circuit
Figure 11. Typical Application of TD1507
R2
2.7K
11K
43K
13K
Vout
3.3V
5V
9V
12V
R1
Cf (Operational)
1.6K
3.6K
6.8K
1.5K
33nf
10nf
1.5nf
1nf
Table 1. Vout VS. R1, R2, Cf Select Table
Output
Voltage
3.3V
Input
Voltage
Output Capacitor (Cout)
Through Hole Electrolytic
470uf/25V
Inductor (L1)
6V ~ 18V
6V ~36V
8V ~ 18V
8V ~36V
12V ~18V
12V ~36V
15V ~ 18V
15V ~36V
47uh
68uh
33uh
47uh
47uh
47uh
47uh
47uh
560uf/25V
330uf/25V
470uf/25V
330uf/25V
470uf/25V
220uf/25V
330uf/25V
5V
9V
12V
Table 2. Typical Application Buck Regulator Design Procedure
October, 20, 2005.
Techcode Semiconductor Limited
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Datasheet
TD1507
2.5A 150KHZ PWM Buck DC/DC Converter
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.
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
The TO252 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.
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
The TD1507 (TO252 package) junction
temperature rise above ambient temperature with
a 2.5A 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 2.5A 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.
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
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.
The TD1507 is available in TO252-5L package.
The TO252 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 TD1507 junction temperature rises above
ambient temperature for a 2.5A load and different
input and output voltages. The data for these
curves was taken with the TD1507 (TO252
October, 20, 2005.
Techcode Semiconductor Limited
9
Datasheet
TD1507
2.5A 150KHZ PWM Buck DC/DC Converter
Package Information
October, 20, 2005.
Techcode Semiconductor Limited
10
Datasheet
TD1507
2.5A 150KHZ PWM Buck DC/DC Converter
Design Notes
October, 20, 2005.
Techcode Semiconductor Limited
11
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