NJM2625A Datasheet, PDF (1/5 Pages) New Japan Radio – 3-Phase DC Brushless Motor Pre-Drivers Technical Information

3-Phase DC Brushless Motor Pre-Drivers
Technical Information
NJM2625A
1.FEATURE
NJM2625 is a controller and pre-driver for speed control 3-phase blushless DC motor. The device
provides the proper sequencing of 3-phase drive output with external hall elements inputs.(120degree
turn-on mode)
It is possible to control of 3-phase blushless DC motor by added external output buffers.
The device has totem-pole pre-drivers for external power MOS transistors and therefore can make the
target output motor driver by using suitable power elements.
Further more the device has PWM control ,forward-reverse rotation and current limiting function.
2. Application Circuit
The application shown in below circuit is designed for an open loop motor speed control system that the
upper power switch are P-Channel power MOSFET while the lower switches are N-Channel power
MOSFET.
MOSFET drive (Upper:Pch ,Lower:Nch),Lower side PWM
Operating V⁺:12V, supply Vm:24V
3:H1+
+
H1 ^4:H1-
-
5:H2+
+
H2 ^6:H2-
-
7:H3+
+
H3 ^8:H3-
-
19:V+
V+
V+
2:Vref
Vref
20:F/R
Rotor
Position
Decode
UVLO
10:OSC
Saw
Os illato r
9:Verr
+
-
+
-
PWM
COMP
1:FG
FG
11:GND
Logic
V+
Vm
16:WH
17:VH
18:WH
13:WL
14:VL
15:UL
12:ILIMIT
+
-
Motor N
S
S
N
1
’05.07.07