Introduction Of Important Function - Sony HS75 Service Manual

OZ9RRB: OZ9RRB
synchronized with an external signal that eliminates any undesired interference between the controller and
LCD panel. The controller provides a wide dimming range control with a low-frequency Pulse Width Modulation
(LPWM) dimming function. The control logic provides a regulated ignition voltage and appropriate protection for
over-voltage or over-current conditions. The function of each pin is as follows:
PIN NAME
1 ENA_SST_CMP
2 CT
3 GNDA
4 DRV2
5 DRV1
6 VDDA
7 VSEN_DIM
8 ISEN

5.2.3 Introduction of important function

a. Adapter
EMI filter circuit:
coming from outside. L901 is used to reduce the symmetry disturbance and filter the high frequency noise;
C901, C902 can restrain the symmetry and filter the low frequency noise; R918, R919, R920 is used for
discharging the capacitance when cut off the power. NR901 is used to prevent the impulse of surge current
when start the machine, which possesses minus temperature modulus.
Rectifier and filter circuit:
product of 1.414 to AC after it is commuted by bridge rectifier (BD901) and filtered by the capacitance
(C905).
operates at a constant operating frequency. The operating frequency can be
Enable, Soft Start Time and Compensation
Timing Capacitor to Set Striking, Operating and LPWM Frequency
Ground
N MOSFET Drive Output
N MOSFET Drive Output
Supply Voltage
Voltage Sense_Dimming Voltage
Current-Sense Feedback
It is common used to get rid of the disturbance existing in the electric net or
The AC input is changed to a high DC voltage, that magnitude is the
Description
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HS75 Sony