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PDF BL9382 Data sheet ( Hoja de datos )
| Número de pieza | BL9382 | |
| Descripción | 18V (30V spike) 2A Synchronous Buck Converter | |
| Fabricantes | Belling | |
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BL9382
18V (30V spike) 2A Synchronous Buck Converter
DESCRIPTION
The BL9382 is a high efficiency current-mode
synchronous, 18V/2A buck converter. Its input
voltage ranges from 4.5V 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.
BL9382 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 BL9382 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 2A
Range of operation input voltage: Max 18V
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%
Input OVP at 20V
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
BLL9C3283221
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
SOP8 and ESOP8
www.belling.com.cn
1
1 page  
Switching waveform Vin=5V, Iout=0
VOUT
VIN
SW
I_L
BL9382
Switching waveform Vin=5V, Iout=2A
VOUT
VIN
SW
I_L
FUNCTIONAL DECRIPTIONS
Loop Operation
The BL9382 is a wide input range, high-efficiency, DC-to-DC step-down switching regulator, capable of delivering up to
2A 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 3A(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.
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
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| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet BL9382.PDF ] | |
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