Philips DVD-620 Service Manual page 57

Circuit Descriptions, List of Abbreviations, and IC Data
9.7 IC Data
In this paragraph, the internal block diagrams and pinning are
given of ICs that are drawn as 'black box' in the electrical
diagrams (with the exception of 'memory' and 'logic' ICs).
9.7.1 Diagram Power Supply
TY72011P2 Block Diagram (item 7130)
HV
1
NC 2
Demag
3
Ri
FB
4
Ct
5
OVP
6
NC 7
TY72011P2 Pinning (item 7130)
Over Voltage
Protection (Vcc > 41V?)
Last pulse of
demag after 4µs
DEMAG ?
Rf
Verr max = 3V
Verr min = 10mV
1/3
2.5V
Over Current
Protection (OCP)
250mV - 1V max setpoint
V(-) < 1.5V
250mV clamp
More than 128ms?
--> protection circuitry
.
HV
Demag
FB
Ct
OVP
Startup
Internal Vcc
Internal regulator
Clock
OVP
Flip-Flop
R
D
Current comparator
1V
VCO Feedback
Toff = f (Verr)
Verr
Max Toff = f (Ct)
20k
Figure 9-9
nc
1
14
Vcc
nc
2 13
Drive
3 12
Isense
4 11
GND
5 10
nc
6 9
nc nc
7 8
PIN CONNECTIONS
Figure 9-10
DVD 620 /0X1
Vcc pin13
UVLOh = 15V
UVLOl = 7.2V
Internal Clamp
Q
Driver
200ns L.E.B
Vcc pin8
4x10V zener
OVP
500
60mV
9. EN 57
14
13 Vcc
12 DRV
Isense
11
Gnd
10
NC
9
8 NC