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PDF BL9384 Data sheet ( Hoja de datos )
| Número de pieza | BL9384 | |
| Descripción | 18V High Efficiency Synchronous Step-Down Converter | |
| Fabricantes | Belling | |
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BL9384
3A, 18V High Efficiency Synchronous Step-Down Converter
DESCRIPTION
The BL9384 is a wide input range, highefficiency,
DC-to-DC step-down switching regulator, capable
of delivering up to 3A of output current. Current
mode PWM control allows the use of small
external components, such as ceramic input and
output caps, as well as small inductors, while still
providing low output ripples. On top of the
integrated internal synchronous rectifier that
eliminates external Schottky diode, Overall
BL9384 is a highly efficient and robust solution
for DC-DC step-down applications that requires
wide input ranges.
BL9384 is available ESOP8 Packages.
FEATURES
• Wide Input Operating Range from 4.5V to 18V
• Capable of Delivering 3A
• No External Schottky Diode Needed
• Current Mode control
• 0.923V Reference for Low Output voltages
• Logic Control Shutdown
• Thermal shutdown and UVLO
• Available in ESOP8 Package
APPLICATIONS
• LCD TVs
• Notebook computers
• FPGA power supplies
• LED drivers
TYPICAL APPLICATION
PIN OUT
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BL9384
FUNCTIONAL DECRIPTIONS
Loop Operation
The BL9384 is a wide input range, high-efficiency, DC-to-DC step-down switching regulator, capable of delivering up to
3A of output current, integrated with a 110mΩ 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.
COMPONENT SELECTRION
When setting up the BL9384 for different output voltage, please use following recommended component value for the
best performance.
VOUT (V)
8
5
3.3
2.5
1.8
1.2
COUT (µF)
22x2
22x2
22x2
22x2
22x2
22x2
L (µH)
22
15
10
6.8
4.7
3.3
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| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet BL9384.PDF ] | |
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