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PDF TD1483A Data sheet ( Hoja de datos )

Número de pieza TD1483A
Descripción 2.2A 23V Synchronous Rectified Step-Down Converte
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Techcode®
DATASHEET
2.2A 23V Synchronous Rectified Step-Down Converte TD1483A
General Description
Features
The TD1483A is a monolithic pulse-width-modulated (PWM)
synchronous step-down switch mode regulator with two
internal power MOSFETs. It achieves 2.2A continuous output
current over a wide input supply range with excellent load
and line regulation. Current mode operation provides fast
transient response and eases loop stabilization. Fault
condition protection includes cycle-by-cycle current limit and
thermal shutdown.
This device, available in an SOP8-PP package, provides
a very compact solution with minimal external components.
2.2A Output Current
Wide 4.75V to 20V Operating Input Range
Integrated 130mPower MOSFET Switches
Output Adjustable from 0.923V to 20V
Up to 93% Efficiency
Programmable Soft-Start
Stable with Low ESR CeramicOutputCapacitors
Fixed 340KHz Frequency
Cycle-by-Cycle Over Current Protection
Input Under Voltage Lockout
Applications
Distributed Power Systems
Networking Systems
FPGA, DSP, ASIC Power Supplies
Green Electronics/ Appliances
Notebook Computers
Package Types
October, 20, 2010.
Figure 1. Package Types of TD1483A
America STOecPh8code Semiconductor, INC.
1
www.techcodesemi.com

1 page




TD1483A pdf
Techcode®
DATASHEET
2.2A 23V Synchronous Rectified Step-Down Converte TD1483A
Electrical Characteristics
VIN = 12V, Ta = 25unless otherwise specified.
Parameters
Shutdown Supply Current
Symbol
Supply Current
Feedback Voltage
VFB
Feedback Overvoltage Threshold
Error Amplifier Voltage Gain *
AEA
Error Amplifier Transconductance
GEA
High-Side Switch On Resistance * RDS(ON)1
Low-Side Switch On Resistance * RDS(ON)2
High-Side Switch Leakage
Current
Upper Switch Current Limit
Lower Switch Current Limit
COMP to Current Sense
Transconductance
GCS
Oscillation Frequency
Fosc1
Short Circuit Oscillation
Frequency
Fosc2
Maximum Duty Cycle
DMAX
Minimum On Time *
EN Shutdown Threshold Voltage
EN Shutdown Threshold Voltage
Hysteresis
EN Lockout Threshold Voltage
EN Lockout Hysterisis
Test Condition
VEN = 0V
VEN = 2.0V; VFB =
1.0V
4.75V ≤ VIN ≤ 20V
IC = ±10µA
VEN = 0V, VSW = 0V
Minimum Duty Cycle
From Drain to Source
VFB = 0V
VFB = 1.0V
VEN Rising
Min.
0.900
2.4
1.1
2.2
Typ. Max.
1 3.0
1.3 1.5
0.923 0.946
1.1
400
800
130
130
10
3.4
1.1
3.5
340
100
90
220
1.5 2.0
210
2.5 2.7
210
Unit
µA
mA
V
V
V/V
µA/V
mΩ
mΩ
µA
A
A
A/V
KHz
KHz
%
ns
V
mV
V
mV
October, 20, 2010.
America Techcode Semiconductor, INC.
5
www.techcodesemi.com

5 Page





TD1483A arduino
Techcode®
DATASHEET
2.2A 23V Synchronous Rectified Step-Down Converte TD1483A
Function Description
Component Selection
Setting the Output Voltage
The output voltage is set using a resistive voltage
divider from the output voltage to FB pin.The voltage
divider divides the output voltage down to the
feedback voltage by the ratio:
Where VOUT is the output voltage, VIN is the input
voltage, fS is the switching frequency, and ΔIL is the
peak-to-peak inductor ripple current.
Choose an inductor that will not saturate under the
maximum inductor peak current. The peak inductor
current can be calculated by:
Where VFB is the feedback voltage and VOUT is the
output voltage.Thus the output voltage is:
R2 can be as high as 100kΩ, but a typical value is
10kΩ. Using the typical value for R2, R1 is determined
by:
For example, for a 3.3V output voltage, R2 is 10kΩ,
and R1 is 26.1kΩ.
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 will result in less
ripple current that will result in lower output ripple
voltage. However,the larger value inductor will have a
larger physical size, higher series resistance, and/or
lower saturation current. A good rule for determining
the inductance to use is to allow the peak-to-peak
ripple current in the inductor to be approximately 30%
of the maximum switch current limit. Also, make sure
that the peak inductor current is below the maximum
switch current limit. The inductance value can be
calculated by:
Where ILOAD is the load current.
The choice of which style inductor to use mainly
depends on the price vs. size requirements and any
EMI requirements.
Optional Schottky Diode
During the transition between high-side switch and
low-side switch, the body diode of the lowside power
MOSFET conducts the inductor current. The forward
voltage of this body diode is high. An optional Schottky
diode may be paralleled between the SW pin and
GND pin to improve overall efficiency. Table 1 lists
example Schottky diodes and their Manufacturers.
Part Number Voltage/Current Vendor
B130
30V, 1A
Diodes, Inc.
SK13
30V, 1A
Diodes, Inc.
MBRS130
30V, 1A
International Rectifier
Input Capacitor
The input current to the step-down converter is
discontinuous, therefore a capacitor is required to
supply the AC current to the step-down converter
while maintaining the DC input voltage. Use low ESR
capacitors for the best performance. Ceramic
capacitors are preferred, but tantalum or low-ESR
electrolytic capacitors may also suffice. Choose X5R
or X7R dielectrics when using ceramic capacitors.
October, 20, 2010.
America Techcode Semiconductor, INC.
11
www.techcodesemi.com

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