MLX90401
Brushless DC Motor Controller
7.2 Block diagram
5V Regulator
(To Logic)
12V Regulator
(To Boost)
VS (1)
VREG(internal)
UVLO
VREF (2)
UVLO
Note: only one channel shown
Cap Boost
(18,21,24)
V+
OSC -
25kHz
Charge Pump
Sawtooth
Osc R/C (8)
Oscillator
(variable)
Level
GT (17,20,23)
FB (16,19,22)
Shifter
-
Chop
Speed Adj /
+
Disable (7)
UVLO
VREG(internal)
Output Control
Logic
GB (13,14,15)
PWR GND (12)
Fault
-
+
5V
3.5KΩ
Debouncer
/Brake (9)
5V
5V
5V
3.5KΩ
3.5KΩ
Hall A (3)
Hall B (4)
Hall C (5)
5V
3.5KΩ
60°/120°
Select (11)
Debouncer
Debouncer
5V
3.5KΩ
Fwd/Rev (6)
3.5KΩ
GND (10)
Figure 2 : Block diagram
3901090401
Rev 005
Page 6 of 13
Data sheet
Oct/05
MELEXIS [ Melexis Microelectronic Systems ]
