Datasheet


      
SLVS278E – AUGUST 2000 – REVISED MARCH 2003
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
functional block diagram
SOFTSTART1
DLY
DLY
OSC
Timer
SOFTSTART2
DLY
DLY
Phase
V
5 VREG
Current
Protection
Trigger
Skip Comp.
PWM Comp.
Err Amp.
0.85 V
STBY1
UVLO
SIGNAL
STBY2
OVP1
OVP2
UVP1
UVP2
0.85 V+12%
Err Amp.
Skip Comp.
0.85 V
UVLO
SIGNAL
UVLO
Comp.
0.85 V
INV2
INV1
PGcomp4
PGcomp3
INV2
PGcomp2
INV1
0.85 V–7%
PGcomp1
4.5 V
5.0 V
PWM Comp.
Current Comp.
VCC
SOFTSTART1
FB1
INV1
CT
FLT
FB2
INV2
PWM/SKIP
SOFTSTART2
STBY1
STBY2
REF
5V_STBY
GND
POWERGOOD
REG5V_IN
VREF5
LH2
OUT2_u
LL2
OUT2_d
OUTGND2
TRIP2
TRIP1
V
OUTGND1
OUT1_d
LL1
OUT1_u
LH1
SFT1 SFT2
Inverter
0.85 V+12%
0.85 V –19.4%
0.85 V –19.4%
ref
0.85 V –7%
0.85 V +7%
0.85 V +7%
CC
_
+
_
+
_
+
_
+
_
+
_
+
_
+
+
_
+
_
+
+
_
+
_
+
_
+
_
+
_
+
_
+
_
+
_
+
_
+
_
+
–(
V
CC
– VTRIP1V
CC
LSD Trip
HSD Trip
_
+
HSD Trip
LSD Trip
– VTRIP1)
– VTRIP2V
CC
–(
V
CC
– VTRIP2)