TD1501H [ETC]
高电压，适用于舞台灯、LCD液晶显示器、LCD液晶电视、车载DVD/GPS/广告机/电脑周边/安防等。可替代LM2596HVT。;
| 型号： | TD1501H |
| 厂家： | 
ETC |
| 描述： | 高电压，适用于舞台灯、LCD液晶显示器、LCD液晶电视、车载DVD/GPS/广告机/电脑周边/安防等。可替代LM2596HVT。 显示器 电视 电脑 全球定位系统 CD DVD |
| 文件： | 总18页 (文件大小：1111K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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DATASHEET
Techcode®
3A 150KHz PWM Buck DC/DC Converter
TD1501H
汪工 TEL:13828719410 QQ:1929794238
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 3.3V, 5V, and an adjustable output version.
Both versions are capable of driving a 3A load with
excellent line and load regulation.
z
z
z
z
z
z
z
z
z
z
z
z
3.3V, 5V and adjustable output versions
Output adjustable from 1.23v to 54V
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
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 TO-220B/TO220 and TO-263 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 TD1501H is available in TO-220B-5L TO220-5L and
TO-263-5L packages.
Step-down to 3.3V for microprocessors
Package Types
TO220B5L
TO2205L
TO2635L
Figure 1. Package Types of TD1501H
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DATASHEET
Techcode®
3A 150KHz PWM Buck DC/DC Converter
TD1501H
Pin Configurations
Figure 2 Pin Configuration of TD1501H (Top View)
Pin Description
Pin Number
Pin Name Description
1
2
3
4
Vin
Output
GND
FB
Input supply voltage
Switching output
Ground
Output voltage feedback
ON/OFF shutdown
Active is “Low” or floating
5
ON/OFF
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DATASHEET
Techcode®
3A 150KHz PWM Buck DC/DC Converter
TD1501H
Ordering Information
TD1501H □ □
Circuit Type
Output Voltage:
33：3.3V
50：5V
Package
ADJ：ADJ
T:TO220B-5L
L:TO220-5L
S:TO263-5L
Function Block
Figure 3 Function Block Diagram of TD1501H
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DATASHEET
Techcode®
3A 150KHz PWM Buck DC/DC Converter
TD1501H
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 60
-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
23
Thermal Resistance-Junction to Ambient
Thermal Resistance-Junction to Case
ºC / W
ºC / W
RθJA
RθJC
3.5
Recommended Operating Conditions
Parameter
Input Voltage
Symbol
VIN
Min.
Max.
60
Unit
V
3.6
-40
-40
Operating Junction Temperature
Operating Ambient Temperature
TJ
125
85
ºC
TA
ºC
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DATASHEET
Techcode®
3A 150KHz PWM Buck DC/DC Converter
TD1501H
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
4.5
200/250
173
uA
KHz
V
127
IOUT=3A
1.4/1.5
5.5/6.5
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
V
ON/OFF pin input current
VLOGIC=2.5V(Regulator
OFF)
5
15
5
uA
V
LOGIC=0.5V(Regulator
0.02
uA
ON)
Thermal Resistance
Junction to Case
Thermal Resistance
Junction to Ambient
(Note1)
TO220B-5L/TO220-5L
TO263-5L
2.5
3.5
θJC
OC/W
TO220B-5L/TO220-5L
TO263-5L
28
23
θJA
OC/W
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DATASHEET
Techcode®
3A 150KHz PWM Buck DC/DC Converter
TD1501H
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
Min.
Typ.
Max.
Unit
11V≤VIN ≤60V, 0.2A≤
Vout: Output
Voltage
1.193/
1.267/
V
1.23
TD1501H
ADJ
1.180
1.280
ILOAD≤3A, VOUT for 9V
VIN=12V,VOUT=9V,ILOAD
=3A
%
V
88
η: Efficiency
4.75V≤VIN≤60V, 0.2A≤
ILOAD≤3A
Vout: Output
Voltage
3.168/
3.432/
3.3
76
5.0
83
TD1501H
3.3V
3.135
3.465
%
V
VIN=12V, ILOAD=3A
7V ≤ VIN ≤ 60V, 0.2A ≤
η: Efficiency
Vout: Output
Voltage
4.800/
5.200/
TD1501H
5V
4.750
5.250
I
LOAD≤3A
%
VIN=12V, ILOAD=3A
η: Efficiency
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Techcode®
3A 150KHz PWM Buck DC/DC Converter
TD1501H
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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Techcode®
3A 150KHz PWM Buck DC/DC Converter
TD1501H
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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Techcode®
3A 150KHz PWM Buck DC/DC Converter
TD1501H
Typical Application Circuit
Figure 11. Typical Application of TD1501H For 3.3V
Output Capacitor (Cout)
Input Voltage
Inductor (L1)
Through Hole Electrolytic
470uf/25V
Surface Mount Tantalum
6V ~ 18V
6V ~ 60V
47uh
68uh
330uf/6.3V
330uf/6.3V
560uf/25V
Table 1. TD1501H Series Buck Regulator Design Procedure For 3.3V
Figure 12. Typical Application of TD1501H For 5V
Output Capacitor (Cout)
Input Voltage
Inductor (L1)
Through Hole Electrolytic
330uf/25V
Surface Mount Tantalum
220uf/10V
8V ~ 18V
8V ~ 60V
33uh
47uh
470uf/25V
330uf/10V
Table 2. TD1501H Series Buck Regulator Design Procedure For 5V
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DATASHEET
Techcode®
3A 150KHz PWM Buck DC/DC Converter
TD1501H
Figure 13. Typical Application of TD1501H 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 ~45V
8V ~ 18V
8V ~45V
12V ~18V
12V ~45V
15V ~ 18V
15V ~45V
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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Techcode®
3A 150KHz PWM Buck DC/DC Converter
TD1501H
Function Description
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.
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
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.
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 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
Thermal Considerations
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.
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
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
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Techcode®
3A 150KHz PWM Buck DC/DC Converter
TD1501H
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(TD1501H-ADJ) The
voltage divider divides the output voltage down by the
ratio:
the AC current to the step-down converter while
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.
The input capacitor value should be greater than 10μF.
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. The capacitor can be electrolytic, tantalum or ceramic.
Using that value, R2 is determined by:
However since it absorbs the input switching current it
requires an adequate ripple current rating. Its RMS
R2 ~= 8.18 * (VOUT – 1.235) (KΩ)
For example, for a 3.3V output voltage, R1 is 10KΩ, and current rating should be greater than approximately
R2is 17KΩ.
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 TD1501H.
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
The output capacitor is required to maintain the DC
output voltage. Low ESR capacitors are preferred to
determining the inductance is to allow the peak-to-peak
ripple current in the inductor to be approximately 30% of keep the output voltage ripple low. The characteristics of
the maximum load current. Also, make sure that the peak the output capacitor also affect the stability of the
inductor current (the load current plus half the peak to
regulation control system. Ceramic, tantalum, or low
peak inductor ripple current) is below the TBDA minimum ESR electrolytic capacitors are recommended. In the
current limit. The inductance value can be calculated by
the equation:
case of ceramic capacitors, the impedance at the
switching frequency is dominated by the capacitance,
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Techcode®
3A 150KHz PWM Buck DC/DC Converter
TD1501H
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
4A and 5A. 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 TD1501H 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.
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,
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
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Techcode®
3A 150KHz PWM Buck DC/DC Converter
TD1501H
R2. It provides additional stability for high output
TD1501H, and to the VOUT pins of the TD1501H.
voltages, low input-output voltages, and/or very low ESR Current flows in the second loop when the low side diode
is on.
In PCB layout, minimizing the two loops area reduces the
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 TD1501H.
In the TD1501H buck regulator circuit, the two major
power dissipating components are the TD1501H 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.
Ptotal _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 TD1501H and thermal
impedance from junction to ambient.
T (jun-amb) =(Ptotalloss–Pinductorloss)× ΘJA
The maximum junction temperature of TD1501H is
145°C, which limits the maximum load current capability.
Please see the thermal de-rating curves for the
maximum load current of the TD1501H under different
ambient temperatures.
The thermal performance of the TD1501H 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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Techcode®
3A 150KHz PWM Buck DC/DC Converter
Package Information
TD1501H
TO220B5L
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DATASHEET
Techcode®
3A 150KHz PWM Buck DC/DC Converter
TD1501H
Package Information(Cont.)
TO2205L
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DATASHEET
Techcode®
3A 150KHz PWM Buck DC/DC Converter
TD1501H
Package Information(Cont.)
TO2635L
c
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DATASHEET
Techcode®
3A 150KHz PWM Buck DC/DC Converter
TD1501H
Design Notes
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