Sony S95E, Service Manual

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S95E Sony
33
BA9741F:
PWM control, voltage range for working: 3.6~35V, Has such functions as short-voltage protection,
Over-voltage protection, over-current protection and etc. The function of each pin and the circuit diagram inside are
as follows :
PIN NAME FUNCTION PIN NAME FUNCTION
1 CT External timing capacitor 9 VCC Power supply
2 RT External timing resistor 10 2OUT Output 2
3 1IN+ Positive input for error amplifier 1 11 2DTC Output 2 dead time/soft start setting
4 1IN- Positive input for error amplifier 2 12 2FBK Error amplifier 2 output
5 1FBK Error amplifier 1 output 13 2IN+ Positive input for error amplifier
6 1DTC Output 1 dead time/soft start setting 14 2IN- Positive input for error amplifier
7 1OUT Output 1 15 SCP Timing latch setting
8 GND Ground 16 REF Reference voltage output (2.5v)
5.2.3 Introduction of important function
a. Adapter
EMI filter circuit: It is common used to get rid of the disturbance existing in the electric net or 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: The AC input is changed to a high DC voltage, that magnitude is the product of