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Número de pieza | SC4614 | |
Descripción | 500kHz Voltage Mode PWM Controller | |
Fabricantes | Semtech Corporation | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de SC4614 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
No Preview Available ! SC4614
500kHz Voltage Mode PWM Controller
POWER MANAGEMENT
Description
Features
The SC4614 is a high-speed, voltage mode PWM con-
troller that provides the control and protection features
necessary for a synchronous buck converter.
The SC4614 is designed to directly drive the top and
bottom MOSFETs of the buck converter. It allows the con-
verter to operate at 500kHz switching frequency with
4V to 25V power rail and as low as 0.5V output. It uses
an internal 8.2V supply as the gate drive voltage for mini-
www.DatamShuemet4Ud.rciovmer power loss and MOSFET switching loss.
The SC4614 features soft-start, supply power under volt-
age lockout, and hiccup mode over current protection.
The SC4614 monitors the output current by using the
Rdson of the bottom MOSFET in the buck converter that
eliminates the need for a current sensing resistor. The
SC4614 is offered in a MSOP-10 package.
Typical Application Circuit
u 500kHz switching frequency
u 4V to 25V power rails
u 0.5V voltage reference for programmable output
voltages
u Internal LDO for optimum gate drive voltage
u 1.5A gate drive current
u Adaptive non-overlapping gate drives provide
shoot-through protection for MOSFETs
u Internal soft start
u Hiccup mode short circuit protection
u Power rail under voltage lockout
u MSOP-10 package, fully RoHS and WEEE compliant
Applications
u Embedded, low cost, high efficiency converters
u Point of load power supplies
u Set top box power supplies
u PDP/TFT TVs
u Consumer electronics
12V IN
1 BST
2 OCS
3 COMP
4 FB
5 GND
DH
PN
DL
VCC
DRV
10
9
8
7
6
SC46 14
+
1.5V OUT
12
+
January 16, 2007
1 www.semtech.com
1 page POWER MANAGEMENT
Block Diagram
www.DataSheet4U.com
SC4614
8.2V
2005 Semtech Corp.
5
www.semtech.com
5 Page POWER MANAGEMENT
Applications Information (Cont.)
Performance Characteristics (12V Input)
Efficiency (%) vs Load Current
90
85
80
75
www.DataSheet4U.com
70
65
60
1 3 5 7 9 11 13 15
Load Current (A)
Load Characteristics (Output vs Load Current)
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
5 10 15
Load Current(A)
20
Gate Waveforms (Io=15A)
DL (10V/DIV)
DH (10V/DIV)
SC4614
Start up
12V Input (5V/DIV)
1.5V Output (1V/DIV)
X=5 m s /DIV
Transient Response
1.5V Output Respo nse (100mV/DIV)
Step Load Current (10A/DIV)
X =2 0 us /DIV
Short Circuit Protection
Output Short
1.5V OUT (1V/DIV)
PN (10V/DIV)
2005 Semtech Corp.
X =5 0 ns /DIV
11
Output Current (10A/DIV)
X= 5 m s /DIV
www.semtech.com
11 Page |
Páginas | Total 14 Páginas | |
PDF Descargar | [ Datasheet SC4614.PDF ] |
Número de pieza | Descripción | Fabricantes |
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SC4612 | Wide Input Range High Performance Synchronous Buck Switching Regulator | Semtech Corporation |
SC4614 | 500kHz Voltage Mode PWM Controller | Semtech Corporation |
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