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PDF AIC2565 Data sheet ( Hoja de datos )
| Número de pieza | AIC2565 | |
| Descripción | 23V 3A Step-Down DC/DC Converter | |
| Fabricantes | Analog Integrations Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AIC2565 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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AIC2565
23V 3A Step-Down DC/DC Converter
FEATURES
3A Continuous Output Current
Programmable Soft Start
100mΩ Internal Power MOSFET Switch
Stable with Low ESR Output Ceramic Capacitors
Up to 95% Efficiency
22µA Supply Current in Shutdown Mode
Fixed 385KHz Frequency
Thermal Shutdown
Cycle by Cycle Over Current Protection
Wide 4.75 to 23V Operating Input Range
Output Adjustable from 1.22V to 16V
Under Voltage Lockout
APPLICATIONS
Networking Products
Distributed Power Systems
Battery Charger
Pre-Regulator for Linear Regulators.
TYPICAL APPLICATIONS CIRCUIT
DESCRIPTION
The AIC2565 is a high efficiency, step-down
DC/DC converter that builds in a high side
power MOSFET. It offers continuous 3A output
current over a very wide input voltage range
with excellent load and line regulation.
Well-performed current mode operation makes
fast transient response and feedback loop
stabilization easier.
The AIC2565 draws only 22A supply current in
shutdown mode. Current limit and thermal
shutdown function are also provided to prevent
damage. The AIC2565 is available in an 8-pin
SOP exposed pad package.
Analog Integrations Corporation
* Note: C7 is needed for high ESR output capacitor
Si-Soft Research Center
3A1, No.1, Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan, R.O.C.
TEL: 886-3-5772500
FAX: 886-3-5772510 www.analog.com.tw
DS-2565G-01 20110304
1
1 page  
AIC2565
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Fig. 7 VREF vs. Temperature
Fig. 8 Output Ripple Voltage
Fig. 9 Output Ripple Voltage
Fig. 10 Startup
Fig. 11 Startup
Fig. 12 Startup
5
5 Page 
AIC2565
Soft-Start Capacitor
The soft-start of AIC2565 begins from VSS=0V and
ends while VSS reaches 1.222V. During the
soft-start period, an internal current source of 6A
(typ.) charges the soft-start capacitor. Hence, the
soft-start capacitor should be large enough to
ensure that the output voltage has reached the
regulation value before the soft-start function has
finished.
Output Voltage Programming
By connecting a resistive divider R1 and R2, the
output voltage of AIC2565 step-down converter
can be set. VOUT can be calculated as:
VOUT
1.222 1
R1
R2
The resistive divider should sit as close to FB pin
as possible.
Loop Compensation
In order to avoid the poor output voltage ripple and
low efficiency caused by instability, AIC2565
requires a proper external compensation network
to compensate its feedback loop. In this external
compensation network, the compensation resistor,
R3, and the compensation capacitor, C6, are used
to set the high-frequency integrator gain and the
integrator zero. C7 is used to cancel the zero
caused by the output capacitor and its ESR. While
using the ceramic capacitor as the output capacitor,
C7 can be omitted due to the small ESR.
The values of the compensation components given
in this data sheet yield a stable control loop for the
given output voltage and capacitor. If different
conversions and output capacitors are requires,
some values of the compensation components
may need to be adjusted to ensure stability.
Layout Consideration
In order to ensure a proper operation of AIC2565,
the following points should be managed
comprehensively.
1. The input capacitor and VIN should be
placed as close as possible to each other to
reduce the input voltage ripple and noise.
2. The output loop, which is consisted of the
inductor, the internal power switch, the
Schottky diode and the output capacitor,
should be kept as small as possible.
3. The routes with large current should be kept
short and wide.
4. Logically the large current on the converter
should flow at the same direction.
5. In order to prevent the effect from noise, the
IC’s GND pin should be placed close to the
ground of the input bypass capacitor and
should be away from the ground of the
Schottky diode.
6. The FB pin should be connected to the
feedback resistors directly and the route
should be away from the noise sources.
Fig. 16 to 19 shows the layout diagrams of
AIC2565.
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet AIC2565.PDF ] | |
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