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PL2733A Schematic ( PDF Datasheet ) - PULAN TECHNOLOGY

Teilenummer PL2733A
Beschreibung Wide Range Synchronous Buck Controller
Hersteller PULAN TECHNOLOGY
Logo PULAN TECHNOLOGY Logo 




Gesamt 9 Seiten
PL2733A Datasheet, Funktion
PULAN TECHNOLOGY CO., LIMITED
PL2733A
Wide Range Synchronous Buck Controller
Features
Wide Input Voltage Range: 8V to 30V
Up to 93% Efficiency
Programmable Switching Frequency up
to up to 500kHz
No Loop Compensation Required
Programmable current limit
Thermal Shutdown
Available in SOP-8L Package
Applications
Car Charger / Adaptor
Pre-Regulator for Linear Regulators
Distributed Power Systems
Battery Charger
Description
The PL2733A is a sy nchronous step down
regulator from a high voltage input supply.
Operating with an input voltage range from 8V
to 30V, the PXL 2733A ac hieves 3.2A continuous
output current with excellent load and line
regulation. The switching frequency is
programmable from 130 kHz to 500 kHz and the
synchronous architecture provides for highly
efficient designs. Current mode operation
provides fast transient response and eases loop
stabilization.
The PL2733 A requires a minimum number of
readily available standard external components.
Other features include cable compensation,
programmable current limit and thermal
shutdown.
The PL2733 A converters are available in the
industry standard SOP-8L packages.
Pin Assignment and Description
18
27
PL2733A
36
45
PIN NAME
1 FB
2 RT
3 ILIM
4 VIN
5, 6 SW
7, 8 GND
DESCRIPTION
Feedback
Frequency Setting
Current Limit
Input Supply Voltage
Switch Node
Ground
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PL2733A Datasheet, Funktion
PULAN TECHNOLOGY CO., LIMITED
PL2733A
Output Cable Resistance Compensation
To compensate for resistive voltage drop across the charger's output cable, the PL2733A integrates a
simple, user-programmable cable voltage drop compensation using the impedance at the FB pin.
Choose the proper feedback resistance values for cable compensation. The delta VOUT voltage rises
when the feedback resistance R3 value rises. The delta VOUT voltage rises when the feedback
resistance R3 value rises. The delta VOUT voltage rises when the feedback resistance R3 value rises,
use the equation below:
ΔVOUT(V) = R3(k) • IOUT(A)/1100
Inductor Selection
For most applications, the value of the inductor will fall in the range of 4.7μH to 47μH. Its value is chosen
based on the desired ripple current. Large value inductors lower ripple current and small value inductors
result in higher ripple currents. Higher VIN or VOUT also increases the ripple current as shown in equation.
A reasonable starting point for setting ripple current is IL=1.28A (40% of 3.2A).
The DC current rating of the inductor should be at least equal to the maximum load current plus half the
ripple current to prevent core saturation. Thus, a 4.48A rated inductor should be enough for most
applications (3.2A + 1.28A). For better efficiency, choose a low DC-resistance inductor.
Different core materials and shapes will change the size/current and price/current relationship of an
inductor. Toroid or shielded pot cores in ferrite or perm alloy materials are small and don’t radiate much
energy, but generally cost more than powdered iron core inductors with similar electrical characteristics.
The choice of which style inductor to use often depends more on the price vs. size requirements and
any radiated field/EMI requirements than on what the PL2733A requires to operate.
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