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PDF LSP3127 Data sheet ( Hoja de datos )
| Número de pieza | LSP3127 | |
| Descripción | 52KHz 2A PWM Buck DC/DC Converter | |
| Fabricantes | JBS | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LSP3127 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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JOINT BAYSEMICONDUCTOR CO.,LTD LSP312
.+=$3:0%XFN'&'&&RQYHUWHU
FEATURES
z Output voltage: 3.3V, 5.0V, 12V, and adjustable
output version
z Adjustable version output voltage range:1.23V to
37V±4%
z 52KHz±15% fixed switching frequency
z Voltage mode non-synchronous PWM control
z Thermal-shutdown and current-limit protection
z ON/OFF shutdown control input
z Operating voltage can be up to 40V
z Output load current: 2A
z Low power standby mode
z Built-in switching transistor on chip
z SOP8-EP package
APPLICATIONS
z Simple High-efficiency step-down regulator
z On-card switching regulators
z Positive to negative converter
GENERAL DESCRIPTION
The LSP3127 series are monolithic IC that design for
a step-down DC/DC converter, and own the ability of
driving a 2A load without additional transistor
component. Due to reducing the number of external
component, the board space can be saved easily.
The external shutdown function can be controlled by
logic level and then come into standby mode. The
internal compensation makes feedback control have
good line and load regulation without external design.
Regarding protected function, thermal shutdown is to
prevent over temperature operating from damage,
and current limit is against over current operating of
the output switch. The LSP3127 series operates at a
switching frequency of 52 KHz thus allowing smaller
sized filter components than what would be needed
with lower frequency switching regulators. Other
features include a guaranteed ±4% tolerance on
output voltage under specified input voltage and
output load conditions, and ±15% on the oscillator
frequency. The output version included fixed 3.3V,
5V, 12V, and an adjustable type. The package is
available in a standard SOP8-EP package.
PIN CONFIGURATION
SOP8-EP
(Top View)
PIN DESCRIPTION
Name
VIN
OUTPUT
FB
SD
GND
GND
GND
GND
No.
1
2
3
4
5
6
7
8
Description
Operating Voltage Input
Switching Output
Output Voltage Feedback Control
On/Off Shutdown
Ground
Ground
Ground
Ground
1/
1 page  
JOINT BAYSEMICONDUCTOR CO.,LTD LSP312
.+=$3:0%XFN'&'&&RQYHUWHU
TYPICAL APPLICATION CIRCUITS
(1) Fixed Output Circuit
VIN=24V
C1
220uF/35V
C3
104
R1
R2
U1 LSP3127
1 VIN
5
SD
OUTPUT
FB
2
4
ON/OFF
L1 150uH
D1
SS24
R3
10
C5
22nF
VOUT=+5V/2A
C2
470uF/25V
C4
104
(2) Adjustable Output Circuit
VIN=24V
R3
C1
220uF/35V
C3
104
R4
U1 LSP3127
1
VIN
5 SD
OUTPUT
FB
2
4
ON/OFF
Vout=VFB*(1+R1/R2); VFB=1.23V; R2=1K typical
L1 150uH
VOUT=+5V/2A
D1
SS24
R5
10
C5
22nF
C6 R1
2.2nF
C2
470uF/25V
C4
104
R2
FUNCTION DESCRIPTION
Pin Function
VIN
This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be present
at this pin to minimize voltage transients and to supply the switching currents needed by the regulator.
Ground
Circuit ground.
Output
Internal switch. The voltage at this pin switches between (VIN – VSAT) and approximately – 0.5V, with a duty
cycle of approximately VOUT / VIN. To minimize coupling to sensitive circuitry, the PC board copper area
connected to this pin should be kept a minimum.
Feedback
Senses the regulated output voltage to complete the feedback loop.
Add C6 capacitor (Cff:feed forward capacitor) for ADJ version to add the control loop stability.
5/
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LSP3127.PDF ] | |
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