TD1509 [ETC]
适用于便携式DVD、LCD显示驱动板。液晶显示器、液晶电视、数码相框.电信ADSL.车载DVD/VCD/CD.GPS。安防等; 适用于便携式DVD、LCD显示驱动板。液晶显示器、液晶电视、数码相框.电信ADSL.车载DVD/VCD/CD.GPS。安防等
| 型号： | TD1509 |
| 厂家： | 
ETC |
| 描述： | 适用于便携式DVD、LCD显示驱动板。液晶显示器、液晶电视、数码相框.电信ADSL.车载DVD/VCD/CD.GPS。安防等 |
| 文件： | 总17页 (文件大小：815K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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DATASHEET
Techcode®
2A 150KHz PWM Buck DC/DC Converter
TD1509
汪工 TEL:13828719410 QQ:1929794238
General Description
Features
The TD1509 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,3.3V an adjustable output version. Both
versions are capable of driving a 2A load with excellent
line and load regulation.
z
z
z
z
z
z
z
z
z
z
z
z
5V,3.3V and adjustable output versions
Output adjustable from 1.23v to 43V
Fixed 150KHz frequency internal oscillator
Guaranteed 3A output load current
Input voltage range up to 45V
Low power standby mode, IQ typically 80 µA
TTL shutdown capability
Requiring a minimum number of external components,
these regulators are simple to use and include internal
Excellent line and load regulation
Requires only 4 external components
High efficiency
frequency compensation, and
oscillator.
a
fixed-frequency
Thermal shutdown and current limit protection
Available in SOP8 and DIP8 packages
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
z
z
z
z
z
z
z
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
The TD1509 is available in SOP8 and DIP8 packages.
Step-down to 3.3V for microprocessors
Package Types
SOP8
DIP8
Figure 1. Package Types of TD1509
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Techcode Semiconductor Limited
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DATASHEET
Techcode®
2A 150KHz PWM Buck DC/DC Converter
TD1509
Pin Configurations
DIP8/SOP8
Figure 2 Pin Configuration of TD1509 (Top View)
Pin Description
Pin Number
Pin Name Description
1
2
Vin
Output
GND
FB
Input supply voltage
Switching output
Ground
Output voltage feedback
ON/OFF shutdown
Active is “Low” or floating
5~8
3
4
ON/OFF
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DATASHEET
Techcode®
2A 150KHz PWM Buck DC/DC Converter
TD1509
Ordering Information
TD1509 □ □
Circuit Type
Output Voltage:
3：3.3V
5：5V
Package
P: SOP8
D: DIP8
R：ADJ
Function Block
Figure 3 Function Block Diagram of TD1509
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DATASHEET
Techcode®
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
Symbol
VIN
Value
-0.3 to 45
-0.3 to Vin+0.3
-0.3 to Vin+0.3
-0.3 to Vin+0.3
Internally limited
150
Unit
V
Input Voltage
Feedback Pin Voltage
ON/OFF Pin Voltage
Output Pin Voltage
Power Dissipation
VFB
V
VEN
V
VSW
PD
V
mW
ºC
ºC
ºC
V
Operating Junction Temperature
Storage Temperature
TJ
TSTG
TLEAD
-65 to 150
260
Lead Temperature (Soldering, 10 sec)
ESD (HBM)
2000
MSL
Level3
85
Thermal Resistance-Junction to Ambient
Thermal Resistance-Junction to Case
ºC / W
ºC / W
RθJA
RθJC
45
Recommended Operating Conditions
Parameter
Input Voltage
Symbol
VIN
Min.
Max.
45
Unit
V
3.6
-40
-40
Operating Junction Temperature
Operating Ambient Temperature
TJ
125
85
ºC
TA
ºC
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DATASHEET
Techcode®
2A 150KHz PWM Buck DC/DC Converter
TD1509
Electrical Characteristics
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
Min.
Typ.
Max.
Unit
Adjustable only,
VFB=1.3V
Feedback bias current
Ib
10
50/100
nA
VFB=12V force driver
off
Quiescent current
IQ
5
10
mA
Standby quiescent current
Oscillator frequency
Saturation voltage
Current Limit
ISTBY
FOSC
VSAT
ICL
ON/OFF=5V, VIN=36V
80
150
1.2
3.8
200/250
173
uA
KHz
V
127
IOUT=3A
1.4/1.5
4.2
Peak Current (VFB=0V)
A
IL
IL
Output leakage current
Output=0V (VFB=12V)
Output=-1V (VIN=36V)
Low (Regulator ON)
50
30
uA
mA
V
Output leakage current
ON/OFF pin logic input
Threshold voltage
2
VIL
VIH
1.3
0.6
IH
IL
High (Regulator OFF)
2.0
1.3
5
V
ON/OFF pin input current
VLOGIC=2.5V(Regulator
OFF)
15
5
uA
V
LOGIC=0.5V(Regulator
0.02
45
uA
ON)
Thermal Resistance
Junction to Case
Thermal Resistance
Junction to Ambient
(Note1)
θJC
OC/W
θJA
85
OC/W
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DATASHEET
Techcode®
2A 150KHz PWM Buck DC/DC Converter
TD1509
Electrical Characteristics(Cont.)
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
11V≤VIN≤45V,
Min.
Typ.
Max.
Unit
Vout: Output
Voltage
1.193/
1.180
1.267/
1.280
0.2A≤ILOAD≤3A,
VOUT
1.23
V
TD1509
ADJ
for 9V
VIN=12V,VOUT=9V,ILOAD
=3A
η: Efficiency
88
%
Vout: Output 7V≤VIN≤45V,
Voltage 0.2A≤ILOAD≤3A
4.800/
4.750
5.200/
5.250
5.0
83
V
TD1509
5V
η: Efficiency VIN=12V, ILOAD=3A
Vout: Output 4.75V≤VIN≤45V,
%
V
3.168/
3.135
3.432/
3.465
3.3
76
TD1509
3.3V
Voltage
0.2A≤ILOAD≤2A
η: Efficiency VIN=12V, ILOAD=2A
%
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DATASHEET
Techcode®
2A 150KHz PWM Buck DC/DC Converter
TD1509
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
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DATASHEET
Techcode®
2A 150KHz PWM Buck DC/DC Converter
TD1509
Typical Performance Characteristics(Cont.)
Figure 8. ON/OFF Pin Voltage
Figure 9. ON/OFF Pin Sink Current
Figure 10. Output Saturation Characteristics
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DATASHEET
Techcode®
2A 150KHz PWM Buck DC/DC Converter
TD1509
Typical Application Circuit
Figure 11. Typical Application of TD1509 For 3.3V 5V
Output Capacitor (Cout)
Input Voltage
Inductor (L1)
Through Hole Electrolytic
470uf/25V
Surface Mount Tantalum
6V ~ 18V
6V ~ 45V
47uh
68uh
330uf/6.3V
330uf/6.3V
560uf/25V
Table 1. TD1509 Series Buck Regulator Design Procedure For 3.3V
Output Capacitor (Cout)
Input Voltage
Inductor (L1)
Through Hole Electrolytic
330uf/25V
Surface Mount Tantalum
220uf/10V
8V ~ 18V
8V ~ 45V
33uh
47uh
470uf/25V
330uf/10V
Table 2. TD1509 Series Buck Regulator Design Procedure For 5V
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DATASHEET
Techcode®
2A 150KHz PWM Buck DC/DC Converter
TD1509
Figure 12. Typical Application of TD1509 For ADJ
Note:In PCB layout. Reserved an area for CFF
Vout
3.3V
5V
9V
12V
R1
R2
2.7K
11K
43K
13K
Cf (Operational)
1.6K
3.6K
6.8K
1.5K
33nf
10nf
1.5nf
1nf
Table 3. Vout VS. R1, R2, Cf Select Table
Output
Voltage
3.3V
Output Capacitor (Cout)
Through Hole Electrolytic
470uf/25V
Input
Voltage
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 4. Typical Application Buck Regulator Design Procedure
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DATASHEET
Techcode®
2A 150KHz PWM Buck DC/DC Converter
TD1509
Function Description
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 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 SOP8/DIP8 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.
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.
The TD1509 junction temperature rise above ambient
temperature with a 2A 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 2A 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
Thermal Considerations
The TD1509 is available in two packages,.
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DATASHEET
Techcode®
2A 150KHz PWM Buck DC/DC Converter
TD1509
Function Description(Cont.)
this is the output (switch) pin, which should not have
L = (VOUT) * (VIN-VOUT) / VIN * f * ∆I
large areas of copper.) Large areas of copper provide the Where VOUT is the output voltage, VIN is the input
best transfer of heat (lower thermal resistance) to the voltage, f is the switching frequency, and ∆I is the
surrounding air, and moving air lowers the thermal peak-to-peak inductor ripple current.
resistance even further.
Input Capacitor
Setting the Output Voltage
The input current to the step-down converter is
The output voltage is set using a resistive voltage divider discontinuous, and so a capacitor is required to supply
from the output voltage to FB(TD1509-ADJ) The voltage the AC current to the step-down converter while
divider divides the output voltage down by the ratio:
VFB = VOUT * R1 / (R1 + R2)
maintaining the DC input voltage. A low ESR capacitor is
required to keep the noise at the IC to a minimum.
Ceramic capacitors are preferred, but tantalum or
low-ESR electrolytic capacitors may also suffice.
Thus the output voltage is:
VOUT = 1.235 * (R1 + R2) / R1
R1 can be as high as 100KΩ, but a typical value is 10KΩ. The input capacitor value should be greater than 10μF.
Using that value, R2 is determined by:
The capacitor can be electrolytic, tantalum or ceramic.
However since it absorbs the input switching current it
R2 ~= 8.18 * (VOUT – 1.235) (KΩ)
For example, for a 3.3V output voltage, R1 is 10KΩ, and requires an adequate ripple current rating. Its RMS
R2is 17KΩ.
current rating should be greater than approximately
1/2 of the DC load current.
For insuring stable operation should be placed as close
to the IC as possible. Alternately a smaller high quality
ceramic 0.1μF capacitor may be placed closer to the IC
and a larger capacitor placed further away. If using this
technique, it is recommended that the larger capacitor be
a tantalum or electrolytic type. All ceramic capacitors
should be places close to the TD1509.
Inductor
The inductor is required to supply constant current to the
output load while being driven by the switched input
voltage. A larger value inductor results in less ripple
current that in turn results in lower output ripple voltage.
However, the larger value inductor has a larger physical
size, higher series resistance, and/or lower saturation
current. Choose an inductor that does not saturate under
the worst-case load conditions. A good rule for
Output Capacitor
determining the inductance is to allow the peak-to-peak
The output capacitor is required to maintain the DC
ripple current in the inductor to be approximately 30% of output voltage. Low ESR capacitors are preferred to
the maximum load current. Also, make sure that the peak keep the output voltage ripple low. The characteristics of
inductor current (the load current plus half the peak to
the output capacitor also affect the stability of the
peak inductor ripple current) is below the TBDA minimum regulation control system. Ceramic, tantalum, or low
current limit. The inductance value can be calculated by
the equation:
ESR electrolytic capacitors are recommended. In the
case of ceramic capacitors, the impedance at the
switching frequency is dominated by the capacitance,
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DATASHEET
Techcode®
2A 150KHz PWM Buck DC/DC Converter
TD1509
Function Description(Cont.)
and so the output voltage ripple is mostly
independent of the ESR. The output voltage
ripple is estimated to be:
output capacitors, such as solid tantalum capacitors.
VRIPPLE ~= 1.4 * VIN * (fLC/fSW)^2
Where VRIPPLE is the output ripple voltage, VIN
is the input voltage, fLC is the resonant
frequency of the LC filter, fSW is the switching
frequency. In the case of tanatalum or low-
ESR electrolytic capacitors, the ESR
dominates the impedance at the switching
frequency, and so the output ripple is
calculated as:
This capacitor type can be ceramic, plastic, silver mica,
etc.(Because of the unstable characteristics of ceramic
capacitors made with Z5U material, they are not
recommended.)
Note:In PCB layout. Reserved an area for CFF.
Over Current Protection (OCP)
VRIPPLE ~= ∆I * RESR
The cycle by cycle current limit threshold is set between
3.8A and 4A. When the load current reaches the current
limit threshold, the cycle by cycle current limit circuit
turns off the high side switch immediately to terminate
the current duty cycle. The inductor current stops rising.
The cycle by cycle current limit protection directly limits
inductor peak current. The average inductor current is
also limited due to the limitation on peak inductor current.
When the cycle by cycle current limit circuit is triggered,
the output voltage drops as the duty cycle is decreasing.
Where VRIPPLE is the output voltage ripple, ∆I is
the inductor ripple current, and RESR is the
equivalent series resistance of the output
capacitors.
Output Rectifier Diode
The output rectifier diode supplies the current to the
inductor when the high-side switch is off. To reduce
losses due to the diode forward voltage and recovery
times, use a Schottky rectifier.
Thermal Management and Layout
Consideration
Table 1 provides the Schottky rectifier part numbers
based on the maximum input voltage and current rating.
Choose a rectifier who’s maximum reverse voltage rating
is greater than the maximum input voltage, and who’s
current rating is greater than the maximum load current.
In the TD1509 buck regulator circuit, high pulsing current
flows through two circuit loops. The first loop starts from
the input capacitors, to the VIN pin, to the VOUT pins, to
the filter inductor, to the output capacitor and load, and
then returns to the input capacitor through ground.
Current flows in the first loop when the high side switch is
on. The second loop starts from the inductor, to the
output capacitors and load, to the GND pin of the
Feedforward Capacitor (CFF)
For output voltages greater than approximately 8V, an
additional capacitor is required. The compensation
capacitor is typically between 100 pF and 33 nF, and is
wired in parallel with the output voltage setting resistor,
R2. It provides additional stability for high output
TD1509, and to the VOUT pins of the TD1509. Current
flows in the second loop when the low side diode is on.
voltages, low input-output voltages, and/or very low ESR In PCB layout, minimizing the two loops area reduces the
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Techcode Semiconductor Limited
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DATASHEET
Techcode®
2A 150KHz PWM Buck DC/DC Converter
TD1509
Function Description(Cont.)
noise of this circuit and improves efficiency. A ground
Several layout tips are listed below for the best electric
plane is recommended to connect input capacitor, output and thermal performance.
capacitor, and GND pin of the TD1509.
In the TD1509 buck regulator circuit, the two major
power dissipating components are the TD1509 and
output inductor. The total power dissipation of converter
circuit can be measured by input power minus output
power.
1. Do not use thermal relief connection to the VIN and
the GND pin. Pour a maximized copper area to the GND
pin and the VIN pin to help thermal dissipation.
2. Input capacitor should be connected to the VIN pin
and the GND pin as close as possible.
3. Make the current trace from VOUT pins to L to the
GND as short as possible.
P
total _loss = V IN × IIN – V O × IO
The power dissipation of inductor can be approximately
calculated by output current and DCR of inductor.
Pinductor _loss= IO 2 × Rinductor × 1.1
4. Pour copper plane on all unused board area and
connect it to stable DC nodes, like VIN, GND, or VOUT.
5. Keep sensitive signal traces such as trace connecting
FB pin away from the VOUT pins.
The junction to ambient temperature can be got from
power dissipation in the TD1509 and thermal impedance
from junction to ambient.
T (jun-amb) =(Ptotalloss–Pinductorloss)× ΘJA
The maximum junction temperature of TD1509 is 145°C,
which limits the maximum load current capability. Please
see the thermal de-rating curves for the maximum load
current of the TD1509 under different ambient
temperatures.
The thermal performance of the TD1509 is trongly
affected by the PCB layout. Extra care should be taken
by users during the design process to nsure that the IC
will operate under the recommended environmental
conditions.
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DATASHEET
Techcode®
2A 150KHz PWM Buck DC/DC Converter
Package Information
TD1509
SOP8 Package Outline Dimensions
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DATASHEET
Techcode®
2A 150KHz PWM Buck DC/DC Converter
TD1509
Package Information(Cont.)
DIP8 Package Outline Dimensions
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DATASHEET
Techcode®
2A 150KHz PWM Buck DC/DC Converter
Design Notes
TD1509
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