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LM3152 Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer LM3152
Beschreibung (LM3151 - LM3153) SIMPLE SWITCHER CONTROLLER
Hersteller National Semiconductor
Logo National Semiconductor Logo 




Gesamt 20 Seiten
LM3152 Datasheet, Funktion
www.DataSheet.co.kr
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/






LM3152 Datasheet, Funktion
www.DataSheet.co.kr
Simplified Block Diagram
30053203
www.national.com
6
Datasheet pdf - http://www.DataSheet4U.net/

6 Page









LM3152 pdf, datenblatt
www.DataSheet.co.kr
Inductor Designator
L01
L02
L03
L04
L05
L06
L07
L08
L09
L10
L11
L12
L13
L14
L15
L16
L17
L18
L19
L20
L21
L22
L23
L24
L25
L26
L27
L28
L29
L30
L31
L32
L33
L34
L35
L36
L37
L38
L39
L40
L41
L42
L43
L44
L45
L46
L47
L48
TABLE 1. Inductor Selection Table
Inductance (µH)
47
33
22
15
10
6.8
4.7
3.3
2.2
1.5
1
0.68
33
22
15
10
6.8
4.7
3.3
2.2
1.5
1
0.68
0.47
22
15
10
6.8
4.7
3.3
2.2
1.5
1
0.68
0.47
0.33
22
15
10
6.8
4.7
3.3
2.2
1.5
1
0.68
0.47
0.33
Current (A)
7-9
7-9
7-9
7-9
7-9
7-9
7-9
7-9
7-9
7-9
7-9
7-9
9-12
9-12
9-12
9-12
9-12
9-12
9-12
9-12
9-12
9-12
9-12
9-12
12-15
12-15
12-15
12-15
12-15
12-15
12-15
12-15
12-15
12-15
12-15
12-15
15-
15-
15-
15-
15-
15-
15-
15-
15-
15-
15-
15-
Part Name
SER2817H-333KL
SER2814H-223KL
7447709150
RLF12560T-100M7R5
B82477-G4682-M
B82477-G4472-M
DR1050-3R3-R
MSS1048-222
SRU1048-1R5Y
DO3316P-102
DO3316H-681
SER2918H-223
SER2814H-153KL
7447709100
SPT50H-652
SER1360-472
MSS1260-332
DR1050-2R2-R
DR1050-1R5-R
DO3316H-102
SER2817H-223KL
SER2814L-103KL
7447709006
7447709004
MLC1245-152
DO3316H-681
DR73-R33-R
SER2817H-153KL
SER2814H-103KL
SER2013-472ML
SER2013-362L
HA3778-AL
B82477-G4102-M
www.national.com
12
Vendor
COILCRAFT
COILCRAFT
WURTH
TDK
EPCOS
EPCOS
COOPER
COILCRAFT
BOURNS
COILCRAFT
COILCRAFT
COILCRAFT
COILCRAFT
WURTH
COILCRAFT
COILCRAFT
COILCRAFT
COOPER
COOPER
COILCRAFT
COILCRAFT
COILCRAFT
WURTH
WURTH
COILCRAFT
COILCRAFT
COOPER
COILCRAFT
COILCRAFT
COILCRAFT
COILCRAFT
COILCRAFT
EPCOS
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12 Page





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