LB1987H SANYO [Sanyo Semicon Device], LB1987H Datasheet - Page 4

• Manufacturer Part Number: LB1987H
• Description: Three-Phase Brushless Motor Driver for VCR Capstan Motors
• Manufacturer: SANYO [Sanyo Semicon Device]

Control and Current Limiting Functions
Pin Functions
Rf(POWER)
Rf(SENSE)
(LB1987/D)
CTLREF
W
W
W
U
V
U
U
V
V
CTL
LIM
0
Pin
V
OUT
OUT
IN
IN
IN
IN
OUT
IN
IN
S
+
–
+
–
+
–
U phase Hall element input.
Logic H refers to the state where IN
V phase Hall element input.
Logic H refers to the state where IN
W phase Hall element input.
Logic H refers to the state where IN
U phase output.
V phase output.
W phase output.
Output block power supply.
Output current detection.
Current feedback is applied to the control block by inserting the resistor Rf
between these pins and ground. Also, both the lower side saturation
prevention circuit and the torque ripple correction circuit operate according to
the voltage on this pin. In particular, since this voltage sets the
oversaturation prevention level, the lower side oversaturation prevention
operation can be degraded if the value of this resistor is set too low.
Note that the PWR pin and the SENSE pin must be connected together.
Speed control.
This circuit implements constant current drive based on current feedback
from the Rf pin.
Gm = 0.58 A/V typ at Rf = 0.5 Ω
Current limiter function control.
The output current can be modified linearly by the voltage on this pin.
Slope = 0.5 A/V typ at Rf = 0.5 Ω
Gm1 = 0.65 A/V typ
1
Gm1 = 0.65 A/Vty p
Control characteristics
2.35 V typ 3.15 V typ
2.35 Vtyp 3.15 Vtyp
2
(These pins include internal spark killer diodes.)
3
V CTL
Function
Gm2 = 1.50 A/V typ
Gm2 = 1.50 A/Vtyp
+
+
+
V
CTLREF: open
4
V LIM = 5 V
CTLREF: OPEN
> IN
> IN
> IN
LIM
LB1987, 1987D, 1987M, 1987H
= 5 V
–
–
–
5
200 mV typ
200 mVtyp
0
CTL
(+) inputs
Current limiting characteristics
200
Rf(POWER)
1
200
V CC
100 A
Equivalent circuit diagram
OUT for
each phase
2
Slope = 0.50 A/V typ
200
200
100 A
Vs
V CC
3
V LIM
Rf(SENSE)
CTLREF
V
CTLREF: open
Continued on next page.
V CTL = 5 V
CTLREF: OPEN
V CC
CTL
Lower side oversaturation
prevention circuit input
block
150 A
200
200 k
= 5 V
4
(–) inputs
LIM
A12207
No. 6109-4/17
200
200 A
max
V CC
5
V CC
10 A
A12209
A12208