Diodes ZXBM2004 - Manual (Page 3)

ZXBM2004
TWO PHASE VARIABLE SPEED
MOTOR CONTROL PRE-DRIVER
ZXBM2004
Document number: DS33433 Rev. 5 - 2
3 of 19
www.diodes.com
February 2012
© Diodes Incorporated
NEW PROD
UC
T
Functional Block Diagram (Note 1)
Speed &
Lock
Detect
Hall
FG
C
LCK
SPD
H+
H-
Hall
Amp
Locked
Rotor
Detect
Phase
Drive &
Control
GND
V
CC
Set Min
Speed
Vref
SMIN
ThRef
Ph2 Lo
Ph1 Lo
Vcc
Speed Control Voltage
V
SPD
Vcc
C
PWM
D2
RD
V+OP
PWM Osc
Supply Voltage
L1 L2
Set Phase Drive
Current Limit
Vcc
Hall Bias
D1
Notes: 1. The ZXBM2004 has an open-collector FG and RD. Typically a pull-up resistor of 10k Ω is recommended from FG or RD pin to the supply voltage.