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PDF BL8092 Data sheet ( Hoja de datos )
| Número de pieza | BL8092 | |
| Descripción | 18V (30V spike)2.5A Synchronous PFM/PWM Buck Converter | |
| Fabricantes | SHANGHAI BELLING | |
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BL8092
18V (30V spike)2.5A Synchronous PFM/PWM Buck Converter
DESCRIPTION
The BL8092 is a high efficiency current-mode
synchronous, 18V/2.5A buck converter. Its input
voltage ranges from 3.5V to 18V and it provides
an adjustable regulated output voltage from
0.923V to 15V while delivering up to 2A of output
current.
The internal synchronous switches increase
efficiency and eliminate the need for an external
Schottky diode. The switching frequency is set to
340KHz. And the BL8092 will automatically switch
between PFM and PWM mode based on the load
current, thus to enhance the converter efficiency
at light load.
BL8092 consists of many protection block such as
UVLO, input voltage over voltage protection to
stand much higher input voltage spike, thermal
protection and output short circuit protection.
The BL8092 is available in the SOP8 and ESOP8
(with exposed pad for heat dissipation) package.
FEATURES
Adjustable Output Voltage, Vfb=0.923V
Maximum output current is 2.5A
Range of operation input voltage: Max 18V
UVLO: 3.4V (typ.)
Withstand input voltage spike >30V
Standby current: 1mA (typ.)
Operating current at zero load: 1.2mA (typ.)
Line regulation: 0.1%/V (typ.)
Load regulation: 10mV (typ.)
High efficiency, up to 95%
Environment Temperature: -20C~85C
APPLICATIONS
Set-top-box
Consumer Electronic Device for automobile
LCD Monitor and LCD TV
Portable DVD
ADSL Modem, WLAN router
Other 12V or double cell Li-ion battery
powered device
TYPICAL APPLICATION
10uH
VIN
10uF
BST
10nF
SS
VIN EN
BLLCC82203392221
SW COMP
GND FB
0.1uF
100K
3.3nF 5.6K
*Cc optional
26.1K
10K
VOUT
3.3V/2A
22uF
x2
* When Vin is as low as 5V, Cc is recommended to
be 100pf, but not needed when Vin larger than 5V.
PIN OUT
BST SS
VIN EN
BLLLCC822302319222
SW COMP
GND FB
SOP8 and ESOP8
PFM at Light Load
Zero Load Operating Current vs. Vin
7
6
5
4
3
2
1
0
0 5 10 15 20
Vin(V)
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1 page  
Switching waveform Vin=5V, Iout=0
(CH1=Vin, CH2=Vout, CH3=SW, CH4=Isw)
BL8092
Switching waveform Vin=5V, Iout=2A
(CH1=Vin, CH2=Vout, CH3=SW, CH4=Isw)
FUNCTIONAL DECRIPTIONS
Loop Operation
The BL8092 is a wide input range, high-efficiency, DC-to-DC step-down switching regulator, capable of delivering up to
2.5A of output current, integrated with a 110m synchronous MOSFET, eliminating the need for external 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 3.8A (typ). When the current flowing out of SW
exceeds this limit, the high-side MOSFET turns off and the synchronous rectifier turns on. Unlike the traditional method
of current limiting by limiting the voltage at the compensation pin, 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
RDSONs of the MOSFETs and parasitic capacitances. At light load, this loss is prominent and efficiency is therefore very
low. BL8092 employs a proprietary control scheme that improves efficiency in this situation by enabling the device into a
power save mode during light load, thereby extending the range of high efficiency operation.
Faster Transient Response
Normally, people use 3.3nF and 5.6Kohm RC for compensation to keep the loop stable. However, if one needs to have
faster load transient response, 3.3nF and 8.5Kohm is recommended.
www.belling.com.cn
5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet BL8092.PDF ] | |
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