UPD16856 NEC, UPD16856 Datasheet - Page 8

• Manufacturer Part Number: UPD16856
• Description: MONOLITHIC CD-ROM 3-PHASE SPINDLE MOTOR DRIVER
• Manufacturer: NEC

FUNCTION OPERATION TABLE
(1) ST/SP = “H”
Brake: Regenerates via the high-side Pch MOS FET channel.
(2) ST/SP = “L”
Short brake: Turns the high-side MOS FET on and the low-side MOS FET off.
(3) Torque Command
voltage (ECR) and the control voltage (EC).
ECR > EC
ECR < EC
8
The curve shown below is the relationship to torque of the difference (ECR – EC) between the control reference
CMP0
CMP0
H
H
H
H
H
H
L
L
L
L
L
L
Normal rotation
Reverse rotation
Reverse Rotation Pin Voltage (REV)
CMP1
CMP1
H
H
H
H
H
H
L
L
L
L
L
L
L
Input Signal
Input Signal
(–)
Note
CMP2
CMP2
H
H
H
H
H
H
L
L
L
L
L
L
Reverse rotation
Stop
H
PWM
PWM
Data Sheet S13447EJ1V0DS00
H
H
H
H
H
H
L
L
L
L
L
L
Note
100%
Duty cycle
Operation
Brake
Operation
Brake
Operation
Brake
Operation
Brake
Operation
Brake
Operation
Brake
Short brake
Circuit Operation Mode
Note Stops after detecting reverse rotation
–100%
Circuit Operation Mode
Reverse direction torque
Normal direction torque
The reverse drive current flows in the high-side Pch
MOS FET channel on reverse rotation.
ECR–EC
Source
(+)
W
W
V
U
V
U
W
W
U
V
V
U
Sink
PD16856