ELM600xB 1A 1.5MHz high efficiency synchronous PWM step down DC/DC converter
http://www.elm-tech.com
( Adjustable Output Voltage )
■Standard circuit
Vin
L=2.2µH
Vout
●
●
●
●
●
●
●
●
VIN
GND
EN
SW
C1=
4.7µF
C5
C3
C4
R1
R2
C2=
10µF
●
FB
ELM600xB
C6
●
R3
Vin
Vout=Vfb × (1+R1/R2)
with R1 = 300k for typical application, and C3 should be in
the range between 10pF and 47pF for component selection.
■Block diagram
VIN
Slope Comp
+
_
Shut down
control
Current
EN
Sense
Amplifier
M1
UG
Reference
+
_
PWM
Logic
0.6V
FB
PWM
SW
Error
Amplifier
Comparator
M2
LG
Oscillator
Clock
_
+
DCC
GND
Zero-current
Comparator
Rev.1.0
7 - 3
ELM-TECH [ ELM Technology Corporation ]
