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SC4612 Ver la hoja de datos (PDF) - Semtech Corporation
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componentes Descripción
Lista de partido
SC4612
Wide Input Range High Performance Synchronous Buck Switching Controller
Semtech Corporation
SC4612 Datasheet PDF : 24 Pages
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SC4612
POWER MANAGEMENT
Block Diagram
VDD
DRV
GND
OSC
ILIM
SS/EN
INTERNAL REGULATOR
&
BANDGAP GENERATOR
Oscillator
900mV
Current
Limit
SOFT START
&
SS
Enable
TOP Side
Gate Driver
OVP
PWM
BST
DH
PHASE
OVP
PWM Control
OCP
EN
SYNC
Q
SR
OCP
Low Side
Gate Driver
-+
PWM
Synchronous
Mode
VCC
DL
GND
Error
-
Amp.
+
FB
SS
REF
BST
DH
PHASE
DL
FB
EAO
Over Voltage Protection
FB
+
600mV
-
20% OVP
PWM
Enable
SQ
R
Low Side 100% on
Top Side off
Vcc UVLO
Vcc
UVLO
SS
+
-
800mV
PWM
Enable
PWM
Disable
OCP @ Asynchronous Start up
EAO > FB + 0.7
for more than 10
cycles
True
False
Soft Start
Cycle
Allow
Synchronous
mode
Synchronous
Mode
FB
+
Vref
-
Low Side
Rdson OCP
PWM
Enable
SQ
R
PWM
Disable
PWM
Enable
SQ
R
SS
+
Vref+0.5
-
2007 Semtech Corp.
8
www.semtech.com
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