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PDF BL9641 Data sheet ( Hoja de datos )
| Número de pieza | BL9641 | |
| Descripción | 0.7A Step-Down Converter | |
| Fabricantes | BELLING | |
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BL9641
42V Input Standoff Voltage, 0.7A Step-Down Converter
DESCRIPTION
The BL9641 is a wide input range, high-efficiency,
and high frequency DC-to-DC step-down
switching regulator, capable of delivering up to
0.7A of output current. With a fixed switching
frequency of 660KHz, this current mode PWM
controlled converter allows the use of small
external components, such as ceramic input and
output caps, as well as small inductors.BL9641
also employs a proprietary control scheme that
switches the device into a power save mode
during light load, thereby extending the range of
high efficiency operation. An OVP function
protects the IC itself and its downstream system
against input voltage surges. With this OVP
function, the IC can stand off input voltage as
high as 42V, making it an ideal solution for
industrial applications such as smart meters as
well as automotive applications.
In automotive systems, power comes from the
battery, with its voltage typically between 9V and
24V. Including cold crank and double battery
jump-starts, the minimum input voltage may be
as low as 4V and the maximum up to 36V, with
even higher transient voltages. With these high
input voltages, linear regulators cannot be used
for high supply currents without overheating the
regulator. Instead, high efficiency switching
regulators such as BL9641 must be used to
minimize thermal dissipation.
BL9641 is available SOT23-6 Packages.
FEATURES
Wide Input Operating Range from 4V to 38V
Standoff Input Voltage: 42V
High Efficiency at 12V In 5V Out: Up to 92%:
High Efficiency PFM mode at light load
Capable of Delivering 0.7A
No External Compensation Needed
Current Mode control
Logic Control Shutdown
Thermal shutdown and UVLO
Available in SOT23-6 Package
APPLICATIONS
Smart Meters
Industrial Applications
Automotive Applications
PIN OUT
BST 1
GND 2
FB 3
SOT23-6
6 SW
5 IN
4 EN
TYPICAL APPLICATION
VIN Standoff up to 42V
51
IN BST
50V
10μF
4
EN
SW 6
FB 3
GND
2
10nF
10μH
VOUT
3.3V/0.5A
D1 49.9K
16.2K
6.3V
22μF
www.belling.com.cn
1
1 page  
BL9641
TYPICAL CHARACTERISTICS
(Typical values are at TA = 25C unless otherwise specified.)
Start-up Waveform with EN
VIN=12V,VOUT=5V,IOUT=0A
Start-up Waveform with EN=VIN
VIN=12V,VOUT=5V,IOUT=0A
Shutdown Waveform with EN
VIN=30V,VOUT=5V,IOUT=0.5A
VEN
VOUT
VSW
ISW
5ms/div
VIN
VOUT
VSW
ISW
5ms/div
VEN
VOUT
VSW
ISW
5ms/div
Switching Waveform
VIN=12V,VOUT=5V,IOUT=0.1A
Switching Waveform
VIN=12V,VOUT=5V,IOUT=0.3A
Load Transient Response
VIN=12V,VOUT=3.3V,IOUT=0 to 0.5A
VOUT
VSW
5ms/div
VOUT
VSW
5ms/div
VOUT
ISW
5ms/div
Load Transient Response
VIN=12V,VOUT=5V,IOUT=0 to 0.5A
Short-Circuit Response
VIN=24V,VOUT=5V,IOUT=0A to
Short
Short-Circuit Recovery
VIN=24V,VOUT=5V,IOUT= Short to 0A
VOUT VOUT VOUT
ISW
5ms/div
ISW
5ms/div
ISW
5ms/div
www.belling.com.cn
5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet BL9641.PDF ] | |
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