Datasheet


SLVS426 − MAY 2002
www.ti.com
8
FUNCTIONAL BLOCK DIAGRAM
3.3 V
REG.
5 V
REG.
VREF
0.85 V
Fault
Latch
Timer
TIMER
Oscillator
Phase
Inverter
LH1
OUT1_u
LL1
OUT1_d
OUTGND1
VIN_SENSE12
TRIP1
LH2
OUT2_u
LL2
OUT2_d
OUTGND2
TRIP2
LH3
OUT3_u
LL3
OUT3_d
OUTGND3
VIN_SENSE3
TRIP3
STBY_LDO
LDO_GATE
LDO_CUR
LDO_OUT
LDO_IN
REF
REG5V_IN
VREF5
VREF3.3
STBY_VREF3.3
STBY_VREF5
INV_LDO
FLT
PGOUT
PG_DELAY
PWM_SEL
SS_STBY1
FB1
INV1
CT
SS_STBY2
FB2
INV2
SS_STBY3
FB3
INV3
VIN
0.85 V − 7 %
0.85 V + 7 %
+
−
+
+
+
+
−
−
+
−
−
−
4.5 V
LDO
SBRC−CH2
SBRC−CH3
GND
UVLO
SS_STBY
SS_STBY STBY_LDO
STBY_LDO
Current Limit
−
+
−
+
−
+
ERROR Amp.
OVP Comp.
UVP Comp.
0.85 V + 12 %
0.85 V − 35 %
0.85 V
LDO Overshoot
Protection
VIN_SENSE
SBRC−CH1
SOFTSTART
/STBY
Current
Protection
Trigger
−
+
−
+
−
+
+
−
+
−
+
−
+
−
+
SKIP Comp.
ERROR Amp.
PWM Comp.
OVP Comp.
UVP Comp.
Current Comp. 1
Current Comp. 2
−(VIN_SENSE−TRIP)
0.85 V + 12 %
0.85 V − 35 %
0.85 V
0.85 V
Duplicate for CH2 and CH3.