Read Sharp SD-PX15H (serv.man20) Service Manual online
SD-PX15H
8 – 6
IC801 VHiMB3782PF-1: Power (MB3782PF)
Pin No.
Terminal Name
Input/Output
Function
1
VREF
Output
2.50 V (standard) output terminal. This terminal sorts load current of up to 3 mA and is used for
an error amplifier reference input and down period setting.
an error amplifier reference input and down period setting.
2
CT
—
Oscillator timing capacitance connection terminal. Capacitance should be within the range of
150 - 1500 pF.
150 - 1500 pF.
3
RT
—
Oscillator timing resistance connection terminal. Resistance should be within the range of 5.1 -
100 k
100 k
Ω. This terminal supplies voltage of VREF x 1/2 and can be used as an error amplifier ref-
erence input.
4
+IN1
Input
Error amplifier 1 non-inverting input terminal.
5
-IN1
Input
Error amplifier 1 inverting input terminal.
6
FB1
Output
Error amplifier 1 output terminal. Adjust gain settings and frequency characteristic by connect-
ing resistance and capacitance between this terminal and -IN1 terminal.
ing resistance and capacitance between this terminal and -IN1 terminal.
7
DTC1
Input
OUT 1 down period setting terminal. Set down period by applying VREF voltage divided by
external resistance. Connect capacitance between this terminal and GND for soft start.
external resistance. Connect capacitance between this terminal and GND for soft start.
8
OUT1
Output
Open collector type output terminal (emitter is connected to GND). It supplies output current of
up to 50 mA.
up to 50 mA.
9
GND
—
Earth terminal.
10
OUT2
Output
Open collector type output terminal (emitter is connected to GND). It supplies output current of
up to 50 mA.
up to 50 mA.
11
DTC2
Input
OUT 2 down period setting terminal. Set down period by applying VREF voltage divided by
external resistance. Connect capacitance between this terminal and GND for soft start.
external resistance. Connect capacitance between this terminal and GND for soft start.
12
FB2
Output
Error amplifier 2 output terminal. Adjust gain settings and frequency characteristic by connect-
ing resistance and capacitance between this terminal and -IN2 terminal.
ing resistance and capacitance between this terminal and -IN2 terminal.
13
-IN2
Input
Error amplifier 2 inverting input terminal.
14
SCP
—
Time constant setting capacitor connection terminal for timer latch type short-circuit protection
circuit. Connect capacitance between this terminal and GND.
circuit. Connect capacitance between this terminal and GND.
15
OUT3
Output
Open collector type output terminal (emitter is connected to GND). It supplies output current of
up to 50 mA.
up to 50 mA.
16
DTC3
Input
OUT 3 down period setting terminal. Set down period by applying VREF voltage divided by
external resistance. Connect capacitance between this terminal and GND for soft start.
external resistance. Connect capacitance between this terminal and GND for soft start.
17
FB3
Output
Error amplifier 3 output terminal. Adjust gain settings and frequency characteristic by connect-
ing resistance and capacitance between this terminal and -IN3 terminal.
ing resistance and capacitance between this terminal and -IN3 terminal.
18
-IN3
Input
Error amplifier 3 inverting input terminal.
19
CTL
Input
Power supply control terminal. Set this terminal “L” to make the IC in the stand-by status and
hold down the power consumption to 10 µA or lower. Input level is TTL or CMOS.
hold down the power consumption to 10 µA or lower. Input level is TTL or CMOS.
20
VCC
Input
Power supply terminal. Power supply voltage should be within the range of 3.6 - 18 V.
V
REF
V
CC
1
20
C
T
CTL
2
19
R
T
-IN3
3
18
+IN1
FB3
4
17
-IN1
DTC3
5
16
FB1
OUT3
6
15
DTC1
SCP
7
14
OUT1
-IN2
8
13
GND
FB2
9
12
OUT2
DTC2
10
11
Figure 8-6 BLOCK DIAGRAM OF IC
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