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PDF PL2733A Data sheet ( Hoja de datos )
| Número de pieza | PL2733A | |
| Descripción | Wide Range Synchronous Buck Controller | |
| Fabricantes | PULAN TECHNOLOGY | |
| Logotipo |  |
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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
PuLan Technology
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PULAN TECHNOLOGY CO., LIMITED
Application Information
PL2733A
The PL2733A operates by a constant frequency, current mode architecture. The output voltage is set
by an external divider returned to the FB pin. An error amplifier compares the divided output voltage with
a reference voltage of 1.21V and adjusts the peak inductor current accordingly.
During normal operation, the internal P-channel MOSFET is turned on each cycle when the oscillator
sets the RS latch, and turned off when the current comparator, resets the RS latch. While the P-channel
MOSFET is off, the N-channel MOSFET is turned on until either the inductor current starts to reverse,
as indicated by the current reversal comparator or the beginning of the next clock cycle.
Thermal Protection
The total power dissipation in PL2733A is limited by a thermal protection circuit. When the device
temperature rises to approximately 145℃, this circuit turns off the output, allowing the IC to cool. The
thermal protection circuit can protect the device from being damaged by overheating in the event of fault
conditions. Continuously running the PL2733A into thermal shutdown degrades device reliability.
Current Limit
Current limit detection occurs during the on-time by monitoring the current through the high-side
P-MOSFET. The current limit value is defined by RLIM. If during the on-time the current in the high-side
P-MOSFET exceeds the user defined current limit value, the next on-time cycle is immediately
terminated. Current sensing is achieved by comparing the voltage across the high-side FET with the
voltage across the current limit set resistor RLIM. The current limit value rises when the set resistor RLIM
rises. For example, the current limit value is 3.0A by the RLIM =68k. The current limit value rises when
the set resistor RLIM rises. The maximum output current is set by RLIM: RLIM (kΩ) = 22• IMAX (A).
Oscillator Frequency
PL2733A oscillator frequency is set by a single external resistor connected between the RT pin
and the GND pin. The resistor should be located very close to the device and connected directly to the
pins of the IC (RT and GND). An internal amplifier holds the RT pin at a fixed voltage typically 0.6V. The
oscillator frequency rises when the resistor RT falls. To determine the timing resistance for a given
switching frequency, use the equation below:
RT(kΩ)= 4800000/ (200*fOSC(kHz)-24000)
Setting Output Voltage
The output voltage is set with a resistor divider from the output node to the FB pin. It is recommended to
use divider resistors with 1% tolerance or better. To improve efficiency at very light loads consider using
larger value resistors. If the values are too high the regulator is more susceptible to noise and voltage
errors from the FB input current are noticeable. For most applications, a resistor in the 10kΩ to 1MΩ
range is suggested for R3. R2 is then given by:
where VREF is 1.21V.
R2 = R3 • [(VOUT / VREF) – 1]
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| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet PL2733A.PDF ] | |
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