ISL6545 Datasheet, PDF (3/16 Pages) Intersil Corporation – 5V or 12V Single Synchronous Buck Pulse-Width Modulation (PWM) Controller

ISL6545, ISL6545A
Block Diagram
VCC
SAMPLE
AND
HOLD
POR AND
INTERNAL
+
-
OC
SOFT-START
REGULATOR
COMPARATOR
5V int.
D_BOOT
FB
COMP/SD
21.5µA
TO
LGATE/OCSET
5V int.
20μA
ERROR
AMP
0.6V +
-
PWM
COMPARATOR
+
-
0.4V _{+ DIS}
-
OSCILLATOR
FIXED 300 (or 600)kHz
20kΩ
INHIBIT
GATE
CONTROL
PWM LOGIC
DIS
VCC
BOOT
UGATE
PHASE
LGATE/OCSET
Typical Application
V_CC
5V or 12V
GND
V_IN
1V TO 12V
R_F
C_F
R_OFFSET
C_DCPL
VCC
51
ISL6545
COMP/SD
8
7
2
BOOT
C_BOOT
PHASE
UGATE
C_I
6
FB
Type II
compensation
shown
3
4
GND
LGATE/OCSET
R_OCSET
R_S
C_HF
C_BULK
L_OUT
C_OUT
+V_O
3
FN6305.5
April 29, 2010