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PDF YB1692 Data sheet ( Hoja de datos )

Número de pieza YB1692
Descripción 2A Synchronous Step-Down Converter
Fabricantes YOBON TECHNOLOGIES 
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YB1692
2A Synchronous Step-Down Converter
Description
The YB1692 is a monolithic synchronous
buck regulator. The device integrates
130mMOSFETS that provide 2A
continuous load cur- rent over a wide
operating input voltage of 4.75V to 18V.
Current mode control provides fast
transient response and cycle-by-cycle cur-
rent limit.
An adjustable soft-start prevents inrush
current at turn-on. In shutdown mode, the
supply cur- rent drops below 1μA.
This device, available in an 8-pin SOP
pack- age, provides a very compact system
solution with minimal reliance on external
components.
Features
„ 2A Output Current
„ Wide 4.75V to 18V Operating Input
Range
„ Integrated 130mPower MOSFET
Switches
„ Output Adjustable from 0.923V to 15V
„ Up to 93% Efficiency
„ Programmable Soft-Start
„ Stable with Low ESR Ceramic Output
Capaci- tors
„ Fixed 340KHz Frequency
„ Cycle-by-Cycle Over Current
Protection
„ Input Under Voltage Lockout
„ Thermally Enhanced 8-Pin SOP
Package
Applications
„ Distributed Power Systems
„ Networking Systems
„ FPGA, DSP, ASIC Power Supplies
„ Green Electronics/ Appliances
„ Notebook Computers
Typical Application Circuit
YB1692 Rev.1.0
Figure1 Typical Application Circuit
www.yobon.com.tw
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YB1692 pdf
YB1692
2A Synchronous Step-Down Converter
Application Information
Component Selection
Setting the Output Voltage
The output voltage is set using a resistive
volt-age divider from the output voltage to FB
(see Typical Application circuit on page 1).
The volt - age divider divides the output
voltage down by the ratio:
Where VFB is the feedback voltage and VOUT is
the output voltage.
Thus the output voltage is:
R2 can be as high as 100k, but a typical
value is 10k.Using the typical value for R2,
R1 is determined by:
For example, for a 3.3V output voltage, R2 is
10k, and R1 is 26.1k. Table 3 lists recom-
mended resistance values of R1 and R2 for
standard output voltages.
Table 3
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 ILOAD is the load current.
The choice of which style inductor to use
mainly de- pends 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 Schot- tky
diode may be paralleled between the SW pin
and GND pin to improve overall efficiency.
Table 4 lists example Schottky diodes and
their Manufacturers.
Table 4
Inductor
The inductor is required to supply constant
cur- rent 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 induc- tance 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 VOUT is the output voltage, VIN is the
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 ca- pacitors 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. Since the input capacitor
absorbs the input switching current it requires
an adequate ripple current rating. The RMS
current in the input capacitor can be
estimated by:
The worst-case condition occurs at VIN =
2VOUT, where ICIN = ILOAD/2. For simplification,
choose the input capacitor whose RMS
YB1692 Rev.1.0
www.yobon.com.tw
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