Philips 32HFL3331/93 Service Manual page 27

8.3 Diagram B01, MP1593 (IC U14)
Block Diagram
IN 2
+
--
0.7V
EN 7
--
2.3V/
+
2.6V
FREQUENCY
FOLDBACK
COMPARATOR
Pin Configuration
BS
IN
SW
GND
EXPOSED PAD
ON BACKSIDE
CONNECT TO PIN 4
INTERNAL
REGULATORS
OSCILLATOR
40/385KHz
SHUTDOWN
COMPARATOR
LOCKOUT
COMPARATOR
+ --
0.7V 1.22V +
--
5
FB
TOP VIEW
1 8
2 7
3 6
4 5
Figure 8-3 Internal block diagram and pin configuration
IC Data Sheets
CURRENT
SENSE
AMPLIFIER
SLOPE
COMP
CLK
+
CURRENT
--
COMPARATOR
ERROR
AMPLIFIER
6 8
COMP SS
SS
EN
COMP
FB
TCM3.1A LA
+
--
S Q
R Q
1.8V
18520_307_090325.eps
8. EN 27
5V
1
BS
M1
3 SW
M2
4
GND
090325
2010-Jun-25