Diodes ZXBM1021 - Manual (Page 4)

ZXBM1021
Document number: DS36322 Rev. 2 - 2
4 of 25
www.diodes.com
April 2014
© Diodes Incorporated
ZXBM1021
Functional Block Diagram
(Note 5)
Speed &
Lock
Detect
Hall
FG
C
LCK
SPD
H+
H-
Hall
Amp
PWM
Integrator
Locked
Rotor
Detect
Phase
Drive &
Control
Gnd
Vcc
Set Min
Speed
Vref
SMIN
ThRef
Ph2 Lo
Ph1 Lo
Ph2 Hi
Ph1 Hi
Vcc
Vcc
Phase
Drive
Current
Monitor
SetTh
Sense
Voltage Speed Control
V
SPD Vcc
Vcc
Hall
Bias
HBIAS
Start-up
SetThRef
PWM SPD
PWM speed control
PWMSPD
C
SPD
D2
RD
V+OP
PWM Osc
Note: 5. The ZXBM1021 has an open-collector FG. Typically a pull- up resistor of 10kΩ is recommended from FG pin to the supply voltage.