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BD63621MUV ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 7 Page - Rohm

๋ถ€ํ’ˆ๋ช… BD63621MUV
์ƒ์„ธ๋‚ด์šฉ  Stepping Motor Driver
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์ œ์กฐ์‚ฌ  ROHM [Rohm]
ํ™ˆํŽ˜์ด์ง€  http://www.rohm.com
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BD63621MUV ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 7 Page - Rohm

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BD63621MUV
TSZ02201-0P2P0B701290-1-2
ฉ 2017 ROHM Co., Ltd. All rights reserved.
21.Dec.2020 Rev.002
www.rohm.com
TSZ22111?15?001
?PWM Constant current control
1) Current control operation
When the output transistor is turned on, the output current increases, raising the voltage over the current sense resistor.
When the voltage on the RNF pin reaches the voltage value set by the internal 2-bit/4-bit DAC and the VREF input voltage,
the current limit comparator engages and enters current decay mode. The output is then held off for a period of time
determined by the RC time constant connected to the CR pin. The process repeats itself constantly for PWM operation.
2) Noise-masking function
In order to avoid misdetection of output current due to RNF spikes that may occur when the output turns ON, the IC
employs an automatic current detection-masking period during charging of CR (tONMIN 0.7ตs Typ) and during change in
internal PHASE (tONMIN2 1.5ตs Typ: fixed in internal circuit), during which current detection is disabled immediately after the
output transistor is turned on. This allows for constant-current drive without the need for an external filter. This
noise-masking period defines the minimum ON-time for the motor output transistor.
3) CR Timer
The CR filter connected to the CR pin is repeatedly charged and discharged between the VCRH and VCRL levels. The
output of the internal comparator is masked while charging from VCRL to VCRH in order to cancel noise. (As mentioned
above, this period defines the minimum ON-time of the motor output transistor.) The CR terminal begins discharging once
the voltage reaches VCRH. When the output current reaches the current limit during this period (i.e. RNF voltage reaches
the decay trigger voltage), then the IC enters decay mode. The CR continues to discharge during this period until it reaches
VCRL, at which point the IC output is switched back ON. The current output and CR pin begin charging simultaneously.
The CR charge time (tONMIN) and discharge time (tdischarge) are set by external components, according to the following
formulas. The total of tONMIN and tdischarge yield the chopping period, tchop.
tONMIN[s]?C?R'?R / (R'+R)?ln[(VCR-0.4)/(VCR-1.0)]
VCR=V?R/(R'+R)
V: internal regulator voltage 5V(Typ)
R': CR terminal internal impedance 5k
?(Typ)
tdischarge[s]?C?R?ln[(1+
?)/0.4]
?:See the right graph.
tCHOP[s]?tONMIN + tdischarge
Figure 4 Timing chart of CR voltage, RNF voltage and output current
Attach a resistor of at least 10 k
? to the CR terminal (10 k? to 200 k? recommended) as lower values may keep the RC from
reaching the VCRH voltage level. A capacitor in the range of 470 pF
? 3300 pF is also recommended. As the capacitance value
is increased, however, the noise-masking period (tonmin) also increases, and there is a risk that the output current may exceed
the current limit threshold due to the internal L and R components of the output motor coil. Also, ensure that the chopping period
(tchop) is not set longer than necessary, as doing so will increase the output ripple, thereby decreasing the average output
current and yielding lower output rotation efficiency. The optimal value should reduce the motor drive noise while keeping
distortion of the output current waveform to a minimum.
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0
500
1000
1500
2000
C?[pF]
CR Voltage
RNF Voltage
Output current
Spike noise
Current limit Value
GND
Minimum ON Time
tONMIN
VCRH(1.0V Typ)
VCRL(0.4V Typ)
GND
0mA
Current limit Value
Chopping Period
tCHOP
Discharge
time
tdischarge


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