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PDF TD1410C Data sheet ( Hoja de datos )
| Número de pieza | TD1410C | |
| Descripción | 1.8A 380KHZ 20V PWM Buck DC/DC Converter | |
| Fabricantes | Techcode | |
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T echcode®
DATASHEET
1.8A 380KHz 20V PWM Buck DC/DC Converter TD1410C
General Description
Features
The TD1410C is a 380 KHz fixed frequency monolithic
step down switch mode regulator with a built in internal
Power MOSFET. It achieves 1.8A continuous output
current over a wide input supply range with excellent
load and line regulation.
The device includes a voltage reference, oscillation
circuit, error amplifier, internal PMOS and etc.
The PWM control circuit is able to adjust the duty ratio
linearly from 0 to 100%. An enable function, an over
current protection function and a short circuit protection
function are built inside. An internal compensation block
is built in to minimize external component count.
z 1.8A Constant Output Current
z 140mΩ RDSON Internal Power PMOSFET Switch
z Up to 95% Efficiency
z Fixed 380KHz Frequency
z Wide 3.6V to 20V Input Voltage Range
z Output Adjustable from 1.222V to 18V
z Built in Frequency Compensation
z Built in Thermal Shutdown Function
z Built in Current Limit Function
z SOP-8 Package is Available
z The minimum dropout up to 0.3V
The TD1410C serves as ideal power supply units for Applications
portable devices.
z Portable DVD
z LCD Monitor / TV
z Battery Charger
z ADSL Modem
z Telecom / Networking Equipment
Package Types
Figure 1. Package Types of TD1410C
1 page  
T echcode®
1.8A 380KHz 20V PWM Buck DC/DC Converter
Electrical Characteristics
DATASHEET
TD1410C
VCC = 12V, Ta = 25℃ unless otherwise specified.
Parameters
Input voltage
Shutdown Supply Current
Supply Current
Feedback Voltage
Feedback Bias Current
Switch Current Limit
Oscillator Frequency
Frequency of Current Limit or
Short Circuit Protection
EN Pin Threshold
EN Pin Input Leakage Current
Internal PMOS RDSON
Max. Duty Cycle
Efficiency
Thermal Shutdown
Symbol
VIN
ISTBY
ICC
VFB
IFB
ILIM
FOSC
FOSC1
VEN
IH
IL
RDSON
DMAX
η
TOTSD
Test Condition
VEN=0V
VEN=2V, VFB=1.3V
VIN = 3.6V to 20V
VFB=1.3V
VFB=0V
VIN =12V, VFB=0V
VEN=2.5V
VEN=0.5V
VIN =12V, VFB=0V
VEN=12V, Iout=1.8A
VFB=0V, ISW=0.1A
VIN=12V ,Vout=5V
Iout=1.8A
Min.
3.6
Typ.
30
Max.
20
90
3.6 4
1.185 1.222
0.1
2.5
1.26
0.5
3.5
320 380 440
Unit
V
uA
mA
V
uA
A
KHz
42 KHz
0.7 1.2 1.7
-0.1 -1
-3 -10
140
V
uA
uA
mΩ
100 %
- 92 -
165
%
ºC
5 Page 
T echcode®
1.8A 380KHz 20V PWM Buck DC/DC Converter
these
DATASHEET
TD1410C
Function Description(Cont.)
output voltage down by the ratio:
VFB = VOUT * R2 / (R1 + R2)
Thus the output voltage is:
VOUT = 1.222 * (R1 + R2) / R2
R2 can be as high as 100KΩ, but a typicalvalue is 10KΩ.
Using that value, R1 is determined by:
R1 ~= 8.18 * (VOUT – 1.222) (KΩ)
For example, for a 3.3V output voltage, R2 is10KΩ, and
R1 is 17KΩ.
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
determining the inductance is to allow the peak-to-peak
ripple current in the inductor to be approximately 30% of
the maximum load current. Also, make sure that the peak
inductor current (the load current plus half the
peak-to-peak inductor ripple current) is below the TBDA
minimum current limit. The inductance value can be
calculated by the equation:
L = (VOUT) * (VIN-VOUT) / VIN * f * ∆I
Where VOUT is the output voltage, VIN is the input
voltage, f is the switching frequency, and ∆I is the
peak-to-peak inductor ripple current.
Input Capacitor
The input current to the step-down converter is
discontinuous, and so a capacitor is required to supply
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 alsosuffice.
The input capacitor value should be greater than 10μF.
The capacitor can be electrolytic, tantalum or ceramic.
However since it absorbs the input switching current it
requires an adequate ripple current rating. Its RMS
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 TD1410C.
Output Capacitor
The output capacitor is required to maintain the DC
output voltage. Low ESR capacitors are preferred to
keep the output voltage ripple low. The characteristics of
the output capacitor also affect the stability of the
regulation control system. Ceramic, tantalum, or low
ESR electrolytic capacitors are recommended. In the
case of ceramic capacitors, the impedance at the
switching frequency is dominated by the capacitance,
and so the output voltage ripple is mostly independent of
the ESR. The output voltage ripple is estimated to be:
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 iscalculated as:
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet TD1410C.PDF ] | |
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