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Número de pieza | LM3153 | |
Descripción | (LM3151 - LM3153) SIMPLE SWITCHER CONTROLLER | |
Fabricantes | National Semiconductor | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de LM3153 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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LM3151/LM3152/LM3153
August 26, 2009
SIMPLE SWITCHER® CONTROLLER, High Input Voltage
Synchronous Step-Down
General Description
The LM3151/2/3 SIMPLE SWITCHER® Controller is an easy
to use and simplified step down power controller capable of
providing up to 12A of output current in a typical application.
Operating with an input voltage range from 6V-42V, the
LM3151/2/3 features a fixed output voltage of 3.3V, and fea-
tures switching frequencies of 250 kHz, 500 kHz, and 750
kHz. The synchronous architecture provides for highly effi-
cient designs. The LM3151/2/3 controller employs a Constant
On-Time (COT) architecture with a proprietary Emulated Rip-
ple Mode (ERM) control that allows for the use of low ESR
output capacitors, which reduces overall solution size and
output voltage ripple. The Constant On-Time (COT) regula-
tion architecture allows for fast transient response and re-
quires no loop compensation, which reduces external com-
ponent count and reduces design complexity.
Fault protection features such as thermal shutdown, under-
voltage lockout, over-voltage protection, short-circuit protec-
tion, current limit, and output voltage pre-bias startup allow for
a reliable and robust solution.
The LM3151/2/3 SIMPLE SWITCHER® concept provides for
an easy to use complete design using a minimum number of
external components and National’s WEBENCH® online de-
sign tool. WEBENCH® provides design support for every step
of the design process and includes features such as external
component calculation with a new MOSFET selector, electri-
cal simulation, thermal simulation, and Build-It boards for
prototyping.
Features
■ PowerWise® step-down controller
■ 6V to 42V Wide input voltage range
■ Fixed output voltage of 3.3V
■ Fixed switching frequencies of 250 kHz/500 kHz/750 kHz
■ No loop compensation required
■ Fully WEBENCH® enabled
■ Low external component count
■ Constant On-Time control
■ Ultra-Fast transient response
■ Stable with low ESR capacitors
■ Output voltage pre-bias startup
■ Valley current limit
■ Programmable soft-start
Typical Applications
■ Telecom
■ Networking Equipment
■ Routers
■ Security Surveillance
■ Power Modules
Typical Application
SIMPLE SWITCHER® is a registered trademark of National Semiconductor Corporation
© 2009 National Semiconductor Corporation 300532
30053201
www.national.com
Datasheet pdf - http://www.DataSheet4U.net/
1 page www.DataSheet.co.kr
Symbol
Boost Diode
Parameter
Vf Forward Voltage
Thermal Characteristics
Thermal Shutdown
TSD Thermal Shutdown Hysteresis
θJA Junction to Ambient
θJC Junction to Case
Conditions
IBST = 2 mA
IBST = 30 mA
Rising
Falling
4 Layer JEDEC Printed Circuit
Board, 9 Vias, No Air Flow
2 Layer JEDEC Printed Circuit
Board. No Air Flow
No Air Flow
Min Typ Max Units
0.7 V
1V
165 °C
15 °C
40
°C/W
140
4 °C/W
Symbol
VOUT
VOUT-OV
VIN-MAX
VIN-MIN
fS
tON
RFB
3.3V Output Option
Parameter
Conditions
Output Voltage
Output Voltage Over-Voltage Threshold
LM3151-3.3
Maximum Input Voltage (Note 4)
LM3152-3.3
LM3153-3.3
LM3151-3.3
Minimum Input Voltage (Note 4)
LM3152-3.3
LM3153-3.3
Switching Frequency
On-Time
FB Resistance to Ground
LM3151-3.3, RON = 115 kΩ
LM3152-3.3, RON = 51 kΩ
LM3153-3.3, RON = 32 kΩ
LM3151-3.3, RON = 115 kΩ
LM3152-3.3, RON = 51 kΩ
LM3153-3.3, RON = 32 kΩ
Min
3.234
3.83
Typ
3.3
4.00
42
33
18
6
6
8
250
500
750
730
400
330
566
Max
3.366
4.17
Units
V
V
V
V
kHz
ns
kΩ
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but does not guarantee specific performance limits. For guaranteed specifications and conditions, see the Electrical Characteristics.
Note 2: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. Test Method is per JESD-22-A114.
Note 3: VCC provides self bias for the internal gate drive and control circuits. Device thermal limitations limit external loading.
Note 4: The input voltage range is dependent on minimum on-time, off-time, and therefore frequency, and is also affected by optimized MOSFET selection.
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Thermal Protection
The LM3151/2/3 should be operated such that the junction
temperature does not exceed the maximum operating junc-
tion temperature. An internal thermal shutdown circuit, which
activates at 165°C (typical), takes the controller to a low-pow-
er reset state by disabling the buck switch and the on-timer,
and grounding the SS pin. This feature helps prevent catas-
trophic failures from accidental device overheating. When the
junction temperature falls back below 150°C the SS pin is re-
leased and normal operation resumes.
Design Guide
The design guide provides the equations required to design
with the LM3151/2/3 SIMPLE SWITCHER® Controller.
WEBENCH® design tool can be used with or in place of this
section for a more complete and simplified design process.
1. Define Power Supply Operating Conditions
a. Maximum and Minimum DC Input voltage
b. Maximum Expected Load Current during normal operation
c. Target Switching Frequency
2. Determine which IC Controller to Use
The desired input voltage range will determine which version
of the LM3151/2/3 controller will be chosen. The higher
switching frequency options allow for physically smaller in-
ductors but efficiency may decrease.
3. Determine Inductor Required Using Figure 2
To use the nomograph below calculate the inductor volt-mi-
crosecond constant ET from the following formula:
Where fS is in kHz units. The intersection of the Load Current
and the Volt-microseconds lines on the chart below will de-
termine which inductors are capable for use in the design. The
chart shows a sample of parts that can be used. The offline
calculator tools and WEBENCH® will fully calculate the re-
quirements for the components needed for the design.
FIGURE 2. Inductor Nomograph
30053252
11
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11 Page |
Páginas | Total 20 Páginas | |
PDF Descargar | [ Datasheet LM3153.PDF ] |
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