ROHM Motor Driver IC Solutions
Evaluation Board:
H-Bridge Motor Drivers
For DC Brush Motors
No.0000000012
BD6212FP, BD6222FP, BD6232FP (2A / 5.5V, 15V, 32V)
●Introduction
This application note will provide the steps necessary to operate and evaluate ROHM’s H-Bridge motor drivers using the BD62x2 evaluation
board. DC brush motors are increasingly required for a broad range of applications. DC brush motor is preferred due to their simplicity,
reliability and low cost. H-bridge driver ICs control the motor’s direction, speed, braking and idling.
●Description
This evaluation board has been developed for ROHM’s H-Bridge driver customers evaluating the BD62x2FP series. The BD62x2FP series
can operate across a wide range of power supply voltages (from 3V to 32V max), supporting output currents of up to 2A. PWM signal
control (20 kHz-100 kHz) or VREF control modes are used to vary motor rotation speeds. ROHM’s ICs are complete with over current
protection (OCP), over voltage protection (OVP), thermal shutdown (TSD) and under voltage lock out (UVLO) protection circuits while also
facilitating a low-power consumption design (10µA max). Overlap (shoot-through) protection to prevent high currents during motor reversal
or breaking is also built in. In addition, the devices are designed to withstand up to 4 kV ESD.
●H-Bridge Motor Driver Operation Modes
a) Stand-by mode
b) Forward mode
c) Reverse mode
d) Brake mode
e) Forward PWM control mode
f) Reverse PWM control mode
g) Forward VREF control mode
h) Reverse VREF control mode
●Applications
VCR; CD/DVD players; A/V equipment; optical disc drives; PC peripherals; car audio; car navigation systems; office automation equipment
●Evaluation Board Operating Limits and Absolute Maximum Ratings
Limit
Parameter
Symbol
Unit
MIN
TYP
MAX
Conditions
Supply Voltage
BD6212
VCC
3
-
5.5
V
BD6222
VCC
6
-
15
V
BD6232
VCC
6
-
32
V
BD6212
VREF
1.5
-
5.5
V
BD6222
VREF
3
-
15
V
BD6232
VREF
3
-
32
V
Max.Output Current
IOMAX
-
-
2
A
VREF bias current
IVREF
-10
0
10
µA
VREF = Vcc
Output
Frequency
FPWM
20
25
35
kHz
BD6212 / BD6222 / BD6232 =>
VREF = 3.75V / 9V / 18V
FMAX
20
-
100
kHz
FIN / RIN
ISTBY
-
0
10
µA
Stand-by
VREF Voltage
Electrical Characteristics
Input
Range
Carrier
Frequency
Stand-by current
1
Application Note
●Evaluation Board Schematic
Below is the evaluation board schematic with the BD62x2 as U1
VCC
VCC
R5_JMP
0
R4_JMP
0
*
Fin
*
Rin
SW2
SPDT
1
2
20
19
VCC
FIN
OUT1
OUT1
RIN
RNF
RNF
BD62X2
C3_DNI
VCC
SPDT
C4_DNI
12
13
EXTERNAL
SW1
U1
C2_DNI
* While using PWM for speed control, the PWM
signal can be connected to FIN or RIN inputs
depending on the direction of rotation.
Refer to the PWM mode description for the
SW1/SW2 positions and jumper R4/R5
positions before feeding the PWM signal.
OUT2
OUT2
VREF
GND
VCC
VCC
VCC
7
8
17
6
R3
R6_DNI
0
R1_DNI
IC
0
C1_DNI
BD6212, BD6222, BD6232
VCC
VREF
R2
SW4
SPDT
232221
C5
10uF
C6_DNI
DNI ------> DO NOT INSERT
JMP ------> JUMPER
Figure 1
●Evaluation Board Labeling Scheme
Below are the labeled pictures of a populated evaluation board and the picture of an unpopulated board for reference
Figure 3
Figure 2
Page 2 of 8
Application Note
●Evaluation Board I/O
Below is a diagram showing the inputs (Vcc, Vref, Rin, and Fin) and outputs (Out1 and Out2) of the evaluation board.
Figure 4
●Evaluation Board Operation Modes (Logic Table)
Below is a truth table describing how to obtain the different modes of operations.
Figure 5
●H-Bridge Motor Driver Operation Modes
The ranges of VCC and VREF will vary for different ICs as follows:
IC
BD6212FP
BD6222FP
BD6232FP
VCC (V)
3 ~ 5.5
6 ~ 15
6 ~ 32
VREF (V)
1.5 ~5.5
3 ~ 15
3 ~ 32
I.
Stand-by mode
a) Both FIN and RIN are set to a low state (2V) and RIN is a low input (2V) and the output is independent of VREF in this state
b) In brake mode all the internal circuits are still operating and this mode is used to quickly stop the motor. The power
consumption in this mode is greater than the stand-by mode.
Page 3 of 8
Application Note
V.
Forward PWM control mode
a) VREF is connected to VCC and RIN is a low input (
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