lb11610p Sanyo Semiconductor Corporation, lb11610p Datasheet - Page 12

• Manufacturer Part Number: lb11610p
• Description: Three-phase Brushless Motor Driver
• Manufacturer: Sanyo Semiconductor Corporation

Rotation pulse signal detection time: Tps = Cs × VBE/ICSDEG(s)
Motor constraint time: Tcsd = ln(V CC /(0.6 – Ibcd × Rc)) × Cc × Rc(s)
Latch release time: Toff = ln(V CC /0.55) × Cre × Rre (s)
CSD voltage rise time (fast charge time): Tchg ≅ Cc × Rc × ln{(V1 – Ic × Rc)/(V2 – Ic × Rc)}(s)
CSD voltage rise time (when the motor is turning): Tchg ≅ Cc×Rc×ln{(V1 - Ic×Rc)/(V2 - Ic×Rc)}(s)
Constraint Time Setting Example
*: Note that if the CSD pin resistor has a relatively high value, the internal comparator's bias current will cause the
Rc: The CSD pin external resistor (connected between the CSD pin and ground)
Ibcd: CSD pin internal comparator bias current (0.5µA, typical)
Cre: The PWMRE pin external capacitor (connected between the PWMRE pin and ground)
Rre: The PWMRE pin external resistor (connected between the PWMRE pin and ground)
Cc: The CSD pin external capacitor (connected between V CC and the CSD pin)
Rc: The CSD pin external resistor (connected between the CSD pin and ground)
Ic: The CSD pin transistor current (7mA: design target value maximum)
V1: The CSD pin initial voltage
V2: The CSD pin voltage value (when the transistor is on) (4.9V, typical)
Cc: The CSD pin external capacitor (connected between V CC and the CSD pin)
Rc: The CSD pin external resistor (connected between the CSD pin and ground)
Ic: The CSD pin transistor current (3.5mA: design target value maximum)
V1: The CSD pin initial voltage
V2: The CSD pin voltage value (when the transistor is on) (4.9V, typical)
To set up a motor constraint protection time of 3 seconds when V CC = 5V.
Let the CSD pin capacitor Cc be 10µF and resistor Rc be 130kΩ.
Motor constraint protection time
• Set the PWMRE potential directly to under 0.55V (typical) (the reset state).
Cs: The CSDEG pin external capacitor (connected between V CC and the CSDEG pin)
VBE: Motor constraint protection circuit block transistor VBE: 0.7V (typical)
ICSDEG: The CSDEG pin discharge current: 50µA (typical)
Cc: The CSD pin external capacitor (connected between V CC and the CSD pin)
The time for the pulse signal that detects motor rotation is set with the CSDEG pin capacitor.
If the CSDEG pin capacitor Cs is set to 0.022µF:
Rotation detection pulse signal time: Tps = 0.022μF × 0.7/50μF = 308μs
*: Note that if the rotation detection pulse signal time is too short, the charge time for the CSD pin capacitor will
If the CSD pin capacitor is too small and the discharge time quick, the rotation detection pulse signal will not be
output for the motor rotation period at the start of motor rotation (or low-speed rotation), and the motor constraint
protection circuit may operate.
For example, if the motor speed is under 100rpm, the UIN output period will be 300ms. Here, a motor constraint
protection time setting of 600ms or higher will be required.
CSD pin potential to rise, and the protection operation may not be performed. A value of under 470kΩ for this
resistor is desirable.
be insufficient and the CSD pin potential will fail to rise adequately.
CSD pin discharge potential threshold voltage: 0.6V (typical)
Tcsd
= ln{5/(0.6 - 130kΩ × 0.5μF)}× 10μF × 130kΩ
= 2.36 × 10 × 0.5μF × 130kΩ ≈ 3s
LB11610P
No.A0345-12/18