SA1582 Datasheet, PDF (4/8 Pages) Silan Microelectronics Joint-stock – BIDIRECTIONAL DC MOTOR DRIVER FOR DISK TRAY MOTION

SA1582
FUNCTION DESCRIPTION
1. LOGIC INPUT & OUTPUT TABLE
Pin4
Low
High
Low
High
Input
Pin5
Low
Low
High
High
Pin2
*Low
High
Low
*Low
Output
Pin8
*Low
Low
High
*Low
INPUT High is above 2.0V.
INPUT Low is below 0.7V.
* Low: all power TRs are off-state. But internal bias makes output voltage low state.
2. DRIVE OUTPUT CIRCUIT
V1
Q1
PVCC
Q4
V2
Q2 Q5
RL
R1 _VO1
M
VO2 ^R2
Q3 Q6
Motor
Brake
Forward
Reverse
Brake
When one input pin is “H”and another is “L”, and pin3 connect to GND with a zener diode; Vzd is the voltage
between pin3 and GND.
V1 = Vzd + 2Vbe ≅ 7.4V + 2 * 0.7V = 8.8V
V2 = Vbe + Vsat ≅ 0.2V + 0.7V = 0.9V
VO1 = V1 - VBEQ1 - VBEQ2
VO2 = VQ6SAT
VO = VO1 - VO2 = V1 - VBEQ1 - VBEQ2 - VQ6SAT
IRL = (VO1 - VO2) / RL
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.2 2006.06.26
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