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PDF WS5203 Data sheet ( Hoja de datos )
| Número de pieza | WS5203 | |
| Descripción | monolithic synchronous buck regulator | |
| Fabricantes | Sany | |
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WS5203
DESCRIPTION
The WS5203 is a monolithic synchronous buck
regulator. The device integrates 100mΩ
MOSFETS that provide 3A continuous load cur-
rent over a wide operating input voltage of
4.75V to 30V. 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 1 μA.
This device, available in an 8-pin ESOP pack-
age, provides a very compact system solution
with minimal reliance on external components.
FEATURES
z 3A Output Current
z Wide 4.75V to 30V Operating Input Range
z Integrated 100mΩ Power MOSFET Switches
z Output Adjustable from 0.925V to 20V
z Up to 95% Efficiency
z Programmable Soft-Start
z Stable with Low ESR Ceramic Output Capaci-
tors
z Fixed 300KHz Frequency
z Cycle-by-Cycle Over Current Protection
z Input Under Voltage Lockout
z Thermally Enhanced 8-Pin SOIC Package
APPLICATIONS
z Distributed Power Systems
z Networking Systems
z Set-top Box
z LCD TV/Monitor
z Notebook or Mini-Book
PACKAGE REFERENCE
Part number
WS5203
Package
SOP8
Temperature
–20° C to +85° C
ABSOLUTE MAXIMUM RATINGS (1)
Supply Voltage (VIN).......................-0.3V to 30V
Switch Voltage (VSW) ...................–1V to VIN + 0.3V
Bootstrap Voltage (VBS) .. .Vsw-0.3V to VSW + 6V
Enable/UVLO Voltage (VEN) ............–0.3V to +6V
Comp Voltage (VCOMP) .....................–0.3V to +6V
Feedback Voltage (VFB) ..................–0.3V to +6V
Junction Temperature ........................... +150°C
Lead Temperature ................................. +260°C
Storage Temperature ............... –55°C to + 150°C
Recommended Operating Conditions(2)
Input Voltage (VIN) ....................... 4.75V to 30V
Output Voltage (VSW) ..................... 0.925 to 20V
Operating Temperature ...................–20°C to +85°C
Thermal Resistance(3) θJA θJC
SOIC8N .....................................50.... 10... °C/W
Notes:
1) Exceeding these ratings may damage the device.
2) The device is not guaranteed to function outside of its
operating conditions.
3) Measured on approximately 1” square of 1 oz copper.
Free Datasheet http://www.nDatasheet.com
1 page  
WS5203
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 VOUT is the output voltage, VIN is the input volt-
age, 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. Table 1 lists recom-
mended resistance values of R1 and R2
for standard output voltages.
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 2 lists
example Schottky diodes and their Manufacturers.
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:
Input Capacitor
The input current to the step-down converter is dis-
continuous, 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 di-
electrics 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:
Free Datasheet http://www.nDatasheet.com
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| PDF Descargar | [ Datasheet WS5203.PDF ] | |
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