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HOT COLD
PF Tuner Power Supply ! T920
DC187V 18 P2 C972
PF10 TO PA10
17 2
14V(UN REG)
NC S3
D925
5 UNR_14V
D971
+
D920 16 PT 3
+
S4 C973
+
+
C920
IC920 C928 C922
15
C970
NC
POWER CONTROL 21V(UN REG)
400V 14 P1 S1A 5
4 5 1 UNR_21V
-
D970
Vcc D 13
NC S1B 6 2 UNR_21V
Latch-stop UVLO
Startup
C921
+
- UVLO
comp
+ comp + + comp
12 NC C971
- - S2A 7
VUL
Vcc(start) Vcc(startup off)
OVP /Vcc(stop) /Vcc(startup on)
comp Startup 11 8
+
R L921 V2 S2B
-
Q
VOVP R924
S 10
Peak Burst Peak V1
Thermal #
Current Current
Shutdown
Limit Limit
R928 R927 Z/C R970
1 Zero Current
Detection
On Dead Timer
C926 S
Stand-By Soft
Q drive
Vref R
S
!
IF/B
2 F/B C914
- Restart
+ Timer
R934 On Time Timer
GND
R935
C924 R929 3
HOT COLD
D926 R925 D922
R940
C925 ! IC921 4 1
R971
FEED BACK
3 2
R972 C975
C974 R976
R974
3 R973
IC970 1
ERROR REF_2.5V
R975
VOLTAGE 2
DET
!
RL901 STAND-BY 5V
7 STB_5V
+
D990 C990
4 1
R990
L.F
9 AC_ON/OFF
3 2
R992
Q990
LF911 HOT COLD
!
F902
POWER ON/OFF CONTROL
R904
K5D312BK0012
COLD
T3.15AL 250V
HOT
PF2 TO P9
AC INLET ! ! !
! F901 T8AH 250V
! AC120V LF904 LF909 LF915 NEUTRAL
4 1 NEUTRAL
AC CORD NEUTRAL
3 4 3 4 3 4 !
GND ! ! ! ! ! C903
C901 R901 CF901 C902 C915
1 L.F L.F L.F
$
LIVE
2 1 2 1 2 1
PF1
4 LIVE
F900 T8AH 250V LIVE
!
! ! !
HOT S901
HOT C911 C910 HOT
COLD COLD COLD
!
CF902
TH-37PE30B/TH-42PE30B TH-37PE30B/TH-42PE30B
PF-Board Block Diagram PF-Board Block Diagram