ISL6721 Datasheet, PDF (3/22 Pages) Intersil Corporation – Flexible Single-ended Current Mode PWM Controller

ISL6721
Typical Application - 48V Input Dual Output Flyback, 3.3V @ 2.5A, 1.8V @ 1.0A
SP1
SP2
VIN+ P9
R1
36-75V
C1
R2
V IN -
SYNC
R5
R6
Q3
VR1
R24
C2
C3
C18
CR6
TP1
Q1
T1
ISOLATION
XFMR
CR5
R21
C21
+ C15
CR2
C5
C17
CR4
C19 +
C22
+
C20
R16
R17
C6
R19
U2
C14
+ C16
+3.3V
+1.8V
R18
RETURN
R4
R3
R23
R25
C4
Q2
D1
TP3
TP5
D2
R22
TP2
U4
GATE
IS E N S E
SYNC
SLOPE
UV
OV
RTCT
IS E T
V_C
PGND
V_CC
VREF
LGND
SS
COMP
VFB
R8
R10
C7
C8
R7
R12
R11
R9
R15
C13
U3
R20
R26
R27
C9
R13
R14
TP4
C12
C11
C10
3
FN9110.6
March 5, 2008