SA1582
FUNCTION DESCRIPTION
1. LOGIC INPUT & OUTPUT TABLE
Input
Output
Motor
Pin4
Low
High
Low
High
Pin5
Low
Low
High
High
Pin2
*Low
High
Low
Pin8
*Low
Low
Brake
Forward
Reverse
Brake
High
*Low
*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
PVCC
V1
Q1
Q4
V2
Q2
Q3
Q5
Q6
RL
M
R1
R2
VO1
VO2
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
I
= (V • V ) / R
O1 O2 L
RL
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.2
2006.06.26
Page 4 of 8
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