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PDF BL8095 Data sheet ( Hoja de datos )
| Número de pieza | BL8095 | |
| Descripción | 24V/1.2A Asynchronous Buck Converter in SOT23-6 | |
| Fabricantes | BELLING | |
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BL8095
24V/1.2A Asynchronous Buck Converter in SOT23-6
DESCRIPTION
The BL8095 is a high efficiency current-mode
asynchronous, 24V/1.2A buck converter. Its input
voltage ranges from 4V to 24V and it provides an
adjustable regulated output voltage from 0.810V
to 5.5V while delivering up to 1.2A of output
current.
The switching frequency is set to 1.4MHz, which
works with a inductor as small as 4.7uH. And the
BL8095 will automatically switch between PFM
and PWM mode based on the load current, thus
to enhance the converter efficiency at light load.
BL8095 consists of many protection blocks such
as UVLO, input voltage over voltage protection to
stand much higher input voltage spike, thermal
protection and output short circuit protection.
The BL8095 is available in the tiny SOT23-6
package.
FEATURES
Adjustable Output Voltage, Vfb=0.810V
Output current is up to 1.2A
Range of operation input voltage: 4-24V
Input voltage UVLO: 3.7V (voltage decreasing)
Input Overvoltage Protection @26V
Withstand input voltage spike >30V
Operating current at zero load: 0.8mA (typ.)
Line regulation: 0.1%/V (typ.)
Load regulation: 10mV (typ.)
High efficiency, up to 90%
Environment Temperature: -20C~85C
APPLICATIONS
Security Camera
Consumer Electronic Device for automobile
Portable DVD
ADSL Modem, WLAN router
Other 12V or double cell Li-ion battery
powered device
TYPICAL APPLICATION and PIN OUT
VIN 12V
25V
10μF
BST 1
5 VIN
SW 6
BLLC8203925 5
4 EN
FB 3
GND
2
10nF
4.7μH
VOUT
5V/1.2A
82K
6.3V
22μF
16K
LOW CURRENT CONSUMPTION
SW VIN EN
654
HBYW
123
BST GND FB
SOT23-6
YW: Date code,
Year and Week
being assembled
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1
1 page  
BL8095
Switching waveform Vin=24V, Iout=0.5A
(CH1=Vin, CH2=Vout, CH3=SW, CH4=Isw)
Switching waveform Vin=24V, Iout=1A
(CH1=Vin, CH2=Vout, CH3=SW, CH4=Isw)
Load Transient Response
Vin=12V, Iout=0.12 - 1A
(CH1=Vin, CH2=Vout, CH4=Isw)
Load Transient Response
Vin=24V, Iout=0.12 - 1A
(CH1=Vin, CH2=Vout, CH4=Isw)
FUNCTIONAL DECRIPTIONS
Loop Operation
The BL8095 is a wide input range, high-efficiency, DC-to-DC step-down switching regulator, capable of delivering up to
1.2A of output current, integrated with a 250m MOSFET, with external schottky diode. It uses a PWM current-mode
control scheme. An error amplifier integrates error between the FB signal and the internal reference voltage. The output
of the integrator is then compared to the sum of a current-sense signal and the slope compensation ramp. This
operation generates a PWM signal that modulates the duty cycle of the power MOSFETs to achieve regulation for output
voltage.
Current Limit
There is a cycle-by-cycle current limit on the high-side MOSFET of 1.5A(typ). When the current flowing out of SW
exceeds this limit, the high-side MOSFET turns off and the external schottky diode rectifier turns on. Unlike the
traditional method of current limiting by limiting the voltage at the internal compensation node, which usually has large
variation due to duty cycle variance, this type of peak current limiting scheme provides a relatively more accurate limit
for output current, thereby lowering the requirements for system design.
Light Load Operation
Traditionally, a fixed current mode constant frequency PWM DC-DC regulator always switches even when the output
load is small. When energy is shuffling back and forth through the power MOSFETs, power is lost due to the finite
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5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet BL8095.PDF ] | |
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