Continued from preceding page
Pin number Pin name Pin voltage
23
VCREF
0V to 3.5V
LB1998
Equivalent circuit
15µA
25µA
25µA
15µA
VCC1
68 kΩ
200Ω
23
Pin function
Control reference voltage supply
pin. Determines control start
voltage.
1
VCIN
0V to 3.5V
22
WOUT
PWR GND
21
VOUT
20
UOUT
18
RF
25
FGSEL
7
BRAKE
A11201
Speed control voltage supply pin
VCC1
V type control technique
6µA
6µA
6µA
VC > VCREF : Forward
VC < VCREF : Slowdown
200Ω
(Reverse-blocking circuit
1
6 pF
23
prevents reverse rotation.)
3.9Ω
3.9Ω
A11202
VCC2
18
20 21 22
PWRGND
A11203
100µA
75 kΩ
50 kΩ
VCC1
25
A11204
VCC1
75 kΩ
3
50 kΩ
A11205
W phase output
Output transistor GND
V phase output
U phase output
Upper side output PNP transistor
collector pin (common for all 3
phases). For current detection,
connect resistor between VCC3
pin and RF pin. Constant current
control and current limiter works
by detecting this voltage.
1 Hall FG/3 Hall FG output,
switching pin:
High –> 3 Hall FG
Low/Open –> 1 Hall FG
Brake mode switching pin
BRAKE:
High –> Short brake
Low/Open –> Reverse brake
Brake mode changes when
VCIN > VCREF.
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