BD6232HFP-TRHFP [ROHM]
Brush DC Motor Controller, 2A, PSSO7, ROHS COMPLIANT, HRP-7;
| 型号： | BD6232HFP-TRHFP |
| 厂家： | 
ROHM |
| 描述： | Brush DC Motor Controller, 2A, PSSO7, ROHS COMPLIANT, HRP-7 驱动器 电机 |
| 文件： | 总8页 (文件大小：659K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ROHM Motor Driver IC Solutions
Evaluation Board:
H-Bridge Motor Drivers
For DC Brush Motors
BD6212FP, BD6222FP, BD6232FP (2A / 5.5V, 15V, 32V)
●Introduction
No.0000000012
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
Conditions
MIN
TYP
MAX
Supply Voltage
BD6212
VCC
VCC
VCC
3
6
6
-
-
-
5.5
15
32
V
V
V
BD6222
BD6232
VREF Voltage
BD6212
BD6222
VREF
VREF
VREF
1.5
3
-
-
-
5.5
15
32
V
V
V
BD6232
3
Electrical Characteristics
Max.Output Current IOMAX
-
-
2
A
VREF bias current
IVREF
FPWM
-10
0
10
µA
VREF = Vcc
Output
Carrier
BD6212 / BD6222 / BD6232 =>
VREF = 3.75V / 9V / 18V
20
25
35
kHz
Frequency
Input
Range
Frequency
FMAX
ISTBY
20
-
-
100
10
kHz
µA
FIN / RIN
Stand-by
Stand-by current
0
1
Application Note
●Evaluation Board Schematic
Below is the evaluation board schematic with the BD62x2 as U1
* 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
VCC
VCC
R5_JMP
0
R4_JMP
0
positions before feeding the PWM signal.
*
*
EXTERNAL
Fin
Rin
SW2
SPDT
SW1
SPDT
VCC
20
19
U1
VCC
C2_DNI
C3_DNI
FIN
RIN
R3
0
1
2
7
8
OUT1
OUT1
RNF
RNF
R6_DNI
VREF
C4_DNI
R2
17
6
BD62X2
12
13
OUT2
OUT2
VREF
GND
R1_DNI
0
SW4
VCCCCCC
IC
C1_DNI
SPDT
232221
BD6212, BD6222, BD6232
VCC
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
VCC (V)
3 ~ 5.5
6 ~ 15
VREF (V)
1.5 ~5.5
3 ~ 15
BD6212FP
BD6222FP
BD6232FP
6 ~ 32
3 ~ 32
I.
Stand-by mode
a) Both FIN and RIN are set to a low state (<0.8V) and the output is independent of VREF in this state
b) In stand-by mode all the internal circuits are turned off and the output goes to high impedance state.
II.
Forward mode
a) VREF is connected to VCC. FIN is a high input (>2V) and RIN is a low input (<0.8V) and are selected through SW2
and SW1 respectively.
b) In the forward mode the OUT1 pin is high and OUT2 pin is low and the motor which is connected between OUT1
and OUT2 rotates in the forward (clockwise) direction.
III.
IV.
Reverse mode
a) VREF is connected to VCC. FIN is a low input (<0.8) and RIN is a high input (>2V) and are selected through SW2
and SW1 respectively.
b) In the reverse mode the OUT1 pin is low and OUT2 pin is high and the motor which is connected between OUT1
and OUT2 rotates in the reverse (anti-clockwise) direction.
Brake mode
a) Both FIN and RIN are set to a high state (>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 (<0.8V), selected through SW1. R5 is disconnected by opening
the jumper connection, SW2 is set to H position and a PWM signal with a frequency range between 20-100kHz with
an amplitude range same as that of VCC is given to FIN.
b) The speed of the motor can be controlled by varying the duty cycle of the input PWM signal. OUT1 pin is high and
OUT2 pin toggles between low and high impedance states. The motor which is connected between OUT1 and
OUT2 rotates in the forward (clockwise) direction. A path for the recovery current from the motor is established by
the 10µF bypass capacitor connected between VCC and GND as shown in Figure 1.
VI.
Reverse PWM control mode
a) VREF is connected to VCC and FIN is a low input (<0.8V), selected through SW2. R4 is disconnected by opening
the jumper connection, SW1 is set to H position and a PWM signal with a frequency range between 20-100kHz with
an amplitude range same as that of VCC is given to RIN.
b) The speed of the motor can be controlled by varying the duty cycle of the input PWM signal. OUT2 pin is high and
OUT1 pin toggles between low and high impedance states. The motor which is connected between OUT1 and
OUT2 rotates in the reverse (anti-clockwise) direction. A path for the recovery current from the motor is established
by the 10µF bypass capacitor connected between VCC and GND as shown in Figure 1.
VII.
Forward VREF control mode
a) FIN is a high input (>2V) and RIN is a low input (<0.8V) and are selected through SW2 and SW1 respectively. The
speed of the motor can be controlled by the VREF voltage given through a potentiometer connection varying
between VCC and ground as shown in the schematic.
b) OUT1 pin is high and OUT2 pin toggles between the low and high and the motor which is connected between
OUT1 and OUT2 rotates in the forward (clockwise) direction. The duty conversion circuit provides the switching
duty corresponding to the voltage levels of the VREF and VCC pins.
c) The on duty is represented by the following equation in this mode,
푽ꢃꢄꢅ (푽)
푶풏 푫ꢀꢁꢂ =
푽ꢆꢆ (푽)
d) The switching on duty is limited by the range of VREF pin voltage. The PWM output carrier frequency in this mode
is 25kHz (nominal). A path for the recovery current from the motor is established by the 10µF bypass capacitor
connected between VCC and ground as shown in Figure 1.
VIII.
Reverse VREF control mode
a) RIN is a high input (>2V) and FIN is a low input (<0.8V) and are selected through SW1 and SW2 respectively. The
speed of the motor can be controlled by the VREF voltage given through a potentiometer connection varying
between VCC and ground as shown in the schematic.
b) OUT2 pin is high and OUT1 pin toggles between the low and high and the motor which is connected between
OUT1 and OUT2 rotates in the reverse (anti-clockwise) direction. The duty conversion circuit provides the switching
duty corresponding to the voltage levels of the VREF and VCC pins.
c) The on duty is represented by the following equation in this mode,
푽ꢃꢄꢅ (푽)
푶풏 푫ꢀꢁꢂ =
푽ꢆꢆ (푽)
d) The switching on duty is limited by the range of VREF pin voltage. The PWM output carrier frequency in this mode
is 25kHz (nominal). A path for the recovery current from the motor is established by the 10µF bypass capacitor
connected between VCC and ground as shown in Figure 1.
Page 4 of 8
Application Note
●Evaluation Board Functional Test Setup
Below is the test setup used to evaluate the board for motor operation in PWM mode
Figure 6
●Board Testing Performed
Appropriate VCC, VREF (refer to the table in the above section for the applicable ranges of VCC and VREF) and GND were
connected to the board and all the modes of operation for the motor driver were tested.
1) VCC, VREF and GND were connected to the board.
2) VREF was connected to VCC to check the stand-by, forward, reverse and the brake modes. Note that the inputs
given to FIN and RIN are different for each mode. The motor rotation was observed to be clockwise for the forward
mode, anti-clockwise for the reverse mode and stationary for the stand-by and the brake modes.
3) The motor speed was varied by varying the duty cycle of the PWM signal in the PWM control mode. PWM signal
was connected to either FIN or RIN depending on forward or reverse PWM control mode. Resistance R5 or R4
(jumper) were disconnected by opening the jumper when the PWM signal was given through FIN and RIN
respectively through the test points. The duty cycle of the PWM signal was varied and the variation of motor rotation
speed was observed.
4) The forward and reverse PWM control modes were tested by giving appropriate inputs to FIN and RIN (refer to
Figure 5 or motor driver operation modes).
5) The VREF control modes were tested by varying the VREF voltage levels. FIN and RIN were connected to the
appropriate inputs depending on the forward or reverse operation (refer to Figure 5 or motor driver operation
modes).
6) Variation in the speed of the motor rotation was observed when the VREF voltage was varied.
Page 5 of 8
Application Note
●Evaluation Board BOM
Below is a table with the build of materials. Part numbers for Digikey have been provided for reference.
Part Type
Symbol
Qty/board
DigiKey Description
Digikey #
Res 0 ohm,
2512
RES 0.0 OHM 1/4W
1206
R2, R3
C5
2
1
RHM0.0
Cap 10uF,
1206
CAP CER 10UF 50V
X5R 20% 1206
445-5999-1-ND
CONN JUMPER
SHORTING 1.27MM
GOLD
Jumpers
Switches
R4, R5
2
3
S9346-ND
SW1, SW2,
SW4
SWITCH SLIDE SPDT
30V.2A PC MNT
EG1903-ND
Test point
Red
TEST POINT PC MINI
.040"D RED
TP1, TP8
2
3
5000K-ND
5001K-ND
Test point
Black
TP2, TP9,
TP10
TEST POINT PC MINI
.040"D BLACK
TP3, TP4,
TP5, TP6,
TP7
Test point
Blue
TEST POINT PC
MINIATURE T/H BLUE
5
1
5117K-ND
IC H-BRIDGE DRIVER
1CH 2A HSOP25
Motor Driver
U1
BD62x2FP-E2TR-ND
●Notes for use
1) The voltage levels for VCC and VREF vary with the chip used (BD6212FP, BD6222FP and BD6232FP). The range
PWM input is same as that of the VCC for each chip.
2) Test points for VCC, VREF, GND, FIN, RIN, OUT1 and OUT2 are provided on the board and the signals can be
connected to these test points for convenience.
3) SW4 which is a switch connecting the VREF voltage to the chip through the R2 resistor needs to be in the same
position for all modes.
4) SW1 is used to select the high or low input to RIN depending on the mode (refer to Figure 5 and the motor driver
operation modes section). In the PWM mode, when the PWM input is to be given to RIN the R4 jumper is opened
and the SW1 is put to H position. PWM input is given to the RIN test point.
5) SW2 is used to select the high or low input to FIN depending on the mode (refer to Figure 5 and the motor driver
operation modes section). In the PWM mode, when the PWM input is to be given to FIN the R5 jumper is opened
and the SW2 is put to H position. PWM input is given to the RIN test point.
6) The resistors R4 and R5 are connected through jumpers in all modes except PWM control modes. In the PWM
mode, a resistor R4 or R5 is removed by opening the jumper at the respective position depending on the forward or
reverse control operation.
7) Connecting the power supply in reverse polarity can damage the IC. Take precautions against the reverse polarity
when connecting the power supply lines, such as adding an external direction diode.
8) Return current generated by the motor’s Back-EMF requires counter-measures, such as providing a return current
path by inserting capacitors across the power supply and GND (10µF ceramic capacitor is recommended). In this
case, it is important to confirm that none of the negative effects sometimes seen with electrolytic capacitors –
including a capacitance drop at low temperatures – occurs. Also, the connected power supply must have sufficient
current absorbing capability. Otherwise, the regenerated current will increase voltage on the power supply line,
which may in turn cause problems with the product, including peripheral circuits exceeding the absolute maximum
rating. To help protect against damage or degradation, physical safety measures should be take, such as providing
voltage clamping diode across the power supply and GND.
9) Strong electromagnetic fields may cause IC malfunctions. Use extreme caution with electromagnetic fields.
10) The thermal shutdown (TSD) circuit in the IC is designed to shut the IC off to prevent thermal runway. It is not
designed to protect the IC or guarantee its operation in the presence of extreme heat. Do not continue to use the IC
after the TSD circuit is activated, and do not operate the IC in an environment where the activation of the circuit is
assumed.
Page 6 of 8
Application Note
11) In case a large capacitor is connected between output and GND, if VCC and VIN are short-circuited with 0V or GND
for any reason, the current charged in the capacitor flows into the output and may destroy the IC. Use a capacitor
smaller than 1µF between output and GND.
12) Connecting a capacitor at low impedance pin subjects the IC to stress. Therefore, always discharge capacitors after
each process or step. Always turn the IC’s power supply off before connecting it to or removing it from the test setup
during the inspection process. Ground the IC during assembly steps as an antistatic measure. Use similar
precaution when transporting or storing the IC.
13) When the operation mode is in PWM control or VREF control, PWM switching noise may affect the control input
pins and cause IC malfunctions. In this case, insert a pull down resistor (10kΩ is recommended) between each
control input pin and ground.
Page 7 of 8
Application Note
Page 8 of 8
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