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PDF BL1084 Data sheet ( Hoja de datos )
| Número de pieza | BL1084 | |
| Descripción | 5A Bipolar Linear Regulator | |
| Fabricantes | BELLING | |
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BL1084
DESCRIPTION
BL1084 is a series of low dropout three
terminal regulators with a typical dropout
voltage of 1.4V at 5A load current.
Other than fixed voltage versions (1.8V, 2.5V,
3.3V, 5.0V), BL1084 has an adjustable
voltage version, with which desired voltage
can be achieved by setting the values of two
external resistors of the application circuitry.
BL1084 offers thermal shut down and current
limit functions to assure the stability of chip
and power system.
BL1084 series is available in standard
packages of TO-263-2L, TO-263-3L, TO-220
and TO-252.
5A Bipolar Linear Regulator
FEATURES
Fixed and adjustable versions.
Maximum output current : 5A
Maximum input voltage: 15V
Line regulation: 0.2％ (Typical)
Load regulation: 0.2％ (Typical)
On-Chip Thermal Shutdown
Operation environment Temperature: -10℃
~ 85℃
APPLICATIONS
Power Management for Computer Mother
Board, Graphic Card
Battery Charger
Post Regulators for Switching Supplies
Microprocessor Supply
TYPICAL APPLICATION
BL1084
Fig 1. BL1084 fixed version Application circuit
NOTE: Input capacitor (Cin=10uF) and Output
capacitor (Cout=22uF) are recommended in all
application circuit. Tantalum capacitor is
preferred.
ELECTRICAL CHARACTERISTICS
1.5
1.4
1.3
1.2
1.1
1
0.9
0.8
0.5 1.5 2.5 3.5 4.5
Iout(A)
Fig 2. Dropout Voltage VS. Output Current
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BLOCK DIAGRAM
BL1084
Fig 3. Block Diagram
DETAILED DESCRIPTION
BL1084 is a series of low dropout voltage three terminal regulators. Its circuit has a trimmed bandgap
reference to ensure output voltage accuracy independent of temperature variance. On-chip thermal shutdown
provides protection against overload and conditions as elevated ambient temperature.
Its application circuitry requires minimum number of external components. Both fixed voltage and
adjustable voltage versions need input and output capacitors to assure output voltage stability. Any desired
output voltage from 1.25V to 10V can be achieved with adjustable version by assigning proper values to two
external resistors in its application circuitry (as shown in Fig.4, as R1, R2 are the two external resistors.).
.
TYPICAL APPLICATION
BL1084 has an adjustable version and fixed versions, Fig.4 shows their typical application circuitry.
A 10uF tan capacitor connected between input and GND as bypass capacitor and a 22uF tan capacitor
between output and GND are recommended for all application.
Using a bypass capacitor (CAdj) between the adjust terminal and ground can improve ripple rejection. The
bypass capacitor prevents ripple from being amplified in case the output voltage is increased. The impedance
of CAdj should be less than the resistance of R1 to prevent ripple from being amplified at any frequency. As
R1 is normally in the range of 120Ω~200Ω, the value of CAdj should satisfy the following condition:
1/(2* FrequencyRipple *Cadj)<R1
A 10µF tan capacitor is recommended.
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Taping reel dimension：
BL1084
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| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet BL1084.PDF ] | |
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