Philips 8000 Series Service Manual page 69
Chassis q551.1e
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- User manual ,
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8.12 Diagram
B08 820400090982 DVBS
Block diagram
CLK1
GND
4
FB1
7
0.8 V
REF
Soft Start
1
EN1
5
EN2
6
SEQ
10
150 k
GND
4
FB2
8
0.8 V
REF
Soft Start
BP
11
150 k
ILIM2
9
150 k
Supply, TPS54283PWP (IC 7T03)
Level
Shift
f(I
) + DC(ofst)
DRAIN1
+
R
COMP
SD1
C
COMP
VDD2
6 A
6 A
150 k
BP
FB1
FB2
CLK2
Level
Shift
f(I
) + DC(ofst)
DRAIN2
+
R
COMP
SD2
C
2
COMP
5.25-V
Regulator
BP
Level
Select
References
Figure 8-12 Internal block diagram and pin configuration
IC Data Sheets
BP
Current
Comparator
+
+
f(I
)
DRAIN1
Overcurrent Comp
f(I
)
f(I
)
SLOPE1
MAX1
TSD
1.2 MHz
Oscilator
SD1
Internal
SD2
Control
UVLO
Output
Undervoltage
Detect
BP
Current
Comparator
+
+
f(I
)
DRAIN2
Overcurrent Comp
f(I
)
f(I
SLOPE2
MAX2
PVDD2
0.8 V
REF
I
(Set to one of two limits)
MAX2
back to
div. table
Q551.1E LA
S
Q
R
R
Q
BP
CLK1
Anti-Cross
Conduction
f(I
)
SLOPE1
Ramp
Gen 1
CLK1
Divide
by 2/4
f(I
)
SLOPE2
Ramp
Gen 2
CLK2
S
Q
R
R
Q
BP
)
CLK2
Anti-Cross
Conduction
8.
EN 69
2
BOOT1
1
PVDD1
3
SW1
Weak
Pull-Down
MOSFET
13
BOOT2
14
PVDD2
FET
Switch
12
SW2
Weak
Pull-Down
MOSFET
UDG-07007
18770_305_100217.eps
100217
2010-Jun-25
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