Datasheet

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
SLUS571 − SEPTEMBER 2003
6
www.ti.com
FUNCTIONAL BLOCK DIAGRAM
21
3
13
2
1
SS1
SS2
FB1
INV1 VLSD
5
11
CT
SCP
14
15
FB2
INV2
7
9
GND
STBY1
10
STBY2
8
REF
25
24
TRIP1
VCC
23
20
TRIP2
OUTGND2
19
18
17
OUT2_D
LL2
OUT2_U
16 LH2
22 VREF5
Soft−Start 1
SFT1
+
+
+
0.85 V
Oscillator
+
+
+
+
+
+
+
OVP1
OVP2
UVP1
+
+
UVP2
0.85 V+12%
0.85 V+12%
0.85 V−22%
0.85 V−22%
+
+
+
0.85 V
Timer
Phase
Inverter
+
PWM
COMP
E/A
Soft−Start 2
Delay
Delay
PWM
COMP
SFT1
SFT2
STBY1
STBY2
UVLO
VLSD
Current
Protection
Trigger
+
26 OUTGND1
27
28
29
OUT1_D
LL1
OUT1_U
30 LH1
Delay
Delay
VLSD
+
VREF 5 VREG
SFT2
STBY2
STBY1
+
+
UVLO
UVLO
Comparator
UDG−03105
E/A
V
CC
0.85 V
Current
Comparator
Current
Comparator