Sony HCD-HX7 Service Manual - Page 52
SUB POWER Board
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HCD-HX3/HX5/HX7 - SUB POWER Board - IC601 MIP2F20MS1SO VDD 1 FB 2 CL 3 VCC 4 6.6V CLAMP CIRCUIT (ILIMIT SETTING) VCL CONSTANT CURRENT SOURCE IN VCL.OUT ICL.LOW ILIMIT VARIABLE CIRCUIT VCC OVP + 2.4V - FOR LIGHT LOAD DETECTION INTERMITTENT OSCILLATION CONTROL + 27% - 22% GENERATOR CLOCK 12kHz MAXDC SQ RQ VDD CLAMP CIRCUIT ILIMIT CORRECTION CIRCUIT - + FOR DRAIN CURRENT DETECT RQ SQ AT TURNING ON BLANKING PULSE GENERATION CIRCUIT GATE DRIVER POWER MOSFET OVERHEAT RESTARTING PROTECTION TRIGGER VCC UV + 7.2V - VDD UV + - 5.7V 5.0V REGULATOR + - 5.7V 8 SOURCE 7 SOURCE 5 DRAIN 52
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52
HCD-HX3/HX5/HX7
CONSTANT
CURRENT
SOURCE
2
FB
1
VDD
4
VCC
5
DRAIN
8
SOURCE
7
SOURCE
3
CL
VCL
CLAMP CIRCUIT
(ILIMIT SETTING)
IN
ICL.LOW
VCL.OUT
ILIMIT VARIABLE
CIRCUIT
+
–
+
–
+
–
7.2V
+
–
2.4V
VCC UV
VCC OVP
OVERHEAT
PROTECTION
S
R
Q
Q
RESTARTING
TRIGGER
R
S
Q
Q
+
–
27%
22%
FOR LIGHT LOAD
DETECTION INTERMITTENT
OSCILLATION CONTROL
GENERATOR
CLOCK
12kHz
MAXDC
5.7V
5.0V
VDD UV
5.7V
REGULATOR
VDD CLAMP
CIRCUIT
6.6V
+
–
ILIMIT
CORRECTION
CIRCUIT
FOR
DRAIN CURRENT
DETECT
GATE DRIVER
POWER
MOSFET
AT TURNING ON
BLANKING PULSE
GENERATION CIRCUIT
– SUB POWER Board –
IC601
MIP2F20MS1SO