Philips HDRW720 Service Manual page 177

1
V CC
internal
supply
M-level
S1
2
GND
FREQUENCY
CONTROL
TEMPERATURE
3
−1
CTRL
2.5 V
burst
detect
TEA1507
SUPPLY
MANAGEMENT
UVLO start
VOLTAGE
CONTROLLED LOGIC
OSCILLATOR
OVER-
LOGIC
PROTECTION
POWER-ON
S Q
RESET
UVLO R Q
MAXIMUM
ON-TIME
PROTECTION
Fig.2 Block diagram.
START-UP
CURRENT SOURCE
clamp
VALLEY
100 mV
OVER-
VOLTAGE
PROTECTION
DRIVER
LEB
blank
OCP
short
0.75 V
winding
OVERPOWER
PROTECTION
8
DRAIN
7 HVS
n.c.
4
DEM
6
DRIVER
I ss
0.5 V
soft
start
S2
5
I sense
MGU230