Philips DVDR615 Service Manual

Circuit-, IC descriptions and list of abbreviations
EN 161DVDR615/69 9.
IC7929 NCP1570D, FEBE Board, DC/DC Converter Control
Figure 9-34
Figure 9-35
–
+
UVLO COMP
–
+
–
+
–
+
Fault Latch
Set Dominant
+
–
0.25 V
Error Amp
–
R
S
Q
PWM Latch
Reset Dominant
PWM COMP
+
Σ
OSC
Art Ramp
80%, 200 kHz
0.525 V
+
–
8.5 V/7.5 V
+
–
0.985 V
S
R
Q
V
CC
GND
V
FB
COMP
GATE(H)
GATE(L)
PGDELAY
PWRGD
Non
Overlap
V
CC
+
–
0.89 V/0.69 V
+
–
+
–
0.25 V
S
R
Q
PGDELAY Latch
Set Dominant
–
+
+
–
3.3 V
12 µA
+
–
PACKAGE PIN DESCRIPTION
PACKAGE PIN #
SO–8
PIN SYMBOL FUNCTION
1 V
CC
Power supply input.
2 PWRGD Open collector output goes low when V
FB
is out of regulation. User
must externally limit current into this pin to less than 20 mA.
3 PGDELAY External capacitor programs PWRGD low–to–high transition delay.
4 COMP Error amp output. PWM comparator reference i nput. A capacitor to
LGND provides error amp compensation and S oft Start. Pulling pin
< 0.45 locks gate outputs to a zero percent duty cycle state.
5 GATE(H) High–side switch FET driver pin. Capable of delivering peak currents
of 1.5 A.
6 GATE(L) Low–side synchronous FET driver pin. Capable of delivering peak
currents of 1.5 A.
7 V
FB
Error amplifier and PWM comparator i nput.
8 GND Power supply return.
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Philips DVDR615 Specifications

Picture/Display

Aspect ratio	4:3, 16:9
D/A converter	10 bit, 54 MHz
A/D converter	10 bit, 54 MHz

Sound

D/A converter	24 bit, 96 kHz
A/D converter	24 bit, 96 kHz
Signal to noise ratio	90
Distortion and Noise (1kHz)	83 dB
Crosstalk (1kHz)	105 dB
Dynamic Range (1kHz)	83 dB

Power

Power supply	110V, 60Hz
Power consumption	27 W
Standby power consumption	< 4 W

Dimensions

Set dimensions (W x H x D)	435 x 285 x 65 mm
Set weight	3.5 kg
Packaging dimensions (W x H x D)	518 x 159 x 383 mm
Weight incl. Packaging	5.5 kg