Samsung SC-140, Service Manual

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TERMINAL TERMINAL FUNCTION REMARKS
NO. SYMBOL
1 Lb(G) b-phase upper side power transistor Keep open.
(base)output terminal
2 La(G) a-phase upper side power transistor Keep open.
(base)output terminal
3 La a-phase output terminal Connect to the coil.
4 VM2 Supply voltage terminal for motor drive Connect to V
M1
externally.
5 SB RUN/STOP control terminal H-:RUN, L:STOP
6 RF1 Output current detection terminal Sets limiter current value.
Connect to R
F2
externally and
between this terminal and GND.
7 GND2 GND -
8 CRF Output current filter terminal Connect a capacitor between this
terminal and GND.
9 N.C
10 FGO FG amplifier output terminal Outputs a signal whose
frequency is determined by the
CD rotation frequency.
11 BRK Brake mode select terminal Output mode when VC>Vref
12 Hb- b-phase negative hall signal input Connect to hall element output
terminal terminal.
13 Hb+ b-phase positive hall signal input Connect to hall element output
terminal terminal.
14 Ha- a-phase negative hall signal input Connect to hall element output
terminal terminal.
15 Ha+ a-phase positive hall signal input Connect to hall element output
terminal terminal.
16 Hc+ c-phase positive hall signal input Connect to hall element output
terminal terminal.
17 Hc- a-phase negative hall signal input Connect to hall element output
terminal terminal.
18 HB Hall element bias terminal Open collector output, Connect to
the negative side of hall element
bias line.
19 Cd Forward/reverse changeover gain Adjust a rotation direction
adjustment terminal changeover gain
20 VCC Supply voltage terminal for control VCC(opr)=4.4~5.5V
circuits
21 VC Control amplifier inputer terminal Use the control signal as input.
22 Vref Control amplifier reference voltage Use the reference voltage for
input terminal the control amplifier as input.
23 OSC Triangular wave oscillation terminal Connect a capacitor between
the control amplifier as input.
24 GND1 GND -
25 RF2 Output current detection terminal Sets limiter current value.
Connect to RF1 externally and
between this terminal and GND.
26 MS Mode select terminal Determines output mode.
27 LC(G) c-phase upper side power transistor Keep open.
(base) output terminal
28 LC c-phase output terminal Connect to the coil.
29 VM1 Supply voltage terminal for motor drive Connect to VM2 externally.
30 Lb b-phase output terminal Connect to the coil.
PIN ASSIGNMENT
SCR-140(A4)-en 99.3.15 8:52 AM ˘ ` 26