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PDF BD6753KV Data sheet ( Hoja de datos )

Número de pieza BD6753KV
Descripción 6-Channel System Lens Driver
Fabricantes ROHM Semiconductor 
Logotipo ROHM Semiconductor Logotipo



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Datasheet
Motor Drivers for Digital Still Cameras
6-Channel System Lens Driver
for Digital Still Cameras
BD6753KV
General Description
The BD6753KV is a motor driver that integrates 4
Full-ON type H-Bridges and 2 PWM Constant-Current
type H-bridges. The device is intended to drive two
stepping motors for auto focus system, either zoom or
iris. It is also available for the new system like a lens
barrier.
Features
Low ON-Resistance Power DMOS Output
Charge Pump for the High-Side DMOS Gate
Drive Mode Switch Function
Three wire serial Interface
Peak Current Control for
PWM Constant-Current Driver
Under Voltage Locked Out Protection
& Thermal Shut Down Circuit
Key Specifications
Power Supply Voltage Range:
2.7V to 5.5V
Motor Power Supply Voltage Range
(VM1):
4.5V to 10.5V
Motor Power Supply Voltage Range
(VM2 to VM4):
2.0V to 10.5V
Circuit Current:
2.2mA(Typ)
Stand-By Current:
10μA(Max)
Control Input Voltage Range:
0V to VCCV
H-Bridge Output Current:
-0.5A/ch to +0.5A/ch
Output ON-Resistance (Each Channel): 1.2Ω(Typ)
Operating Temperature Range: -25°C to +75°C
Package
VQFP48C
W(Typ) x D(Typ) x H(Max)
9.00mm x 9.00mm x 1.60mm
Applications
Mobile system
Home appliance
Amusement system, etc
VQFP48C
Product structureSilicon monolithic integrated circuit
.www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
This product has no designed protection against radioactive rays
1/16
TSZ02201-0H3H0B601380-1-2
09.Dec.2015 Rev.001

1 page




BD6753KV pdf
BD6753KV
Description of Blocks continued
4. Drive System of PWM Constant-Current H-bridge (Channel 5, Channel 6)
(a) Output Current Detection & Current Settings
A low-value (0.1Ω to 5.0Ω) resistor can be placed between the RNF3 or RNF4 pins and ground to detect the
motor winding current. When making the RNF3 and SENSE3 pins or RNF4 and SENSE4 short-circuit, the internal
circuits can output the accurate constant current by comparing the external voltage of VLIM5 or VLIM6 pin with
detecting voltage. The internal reference voltage (VREF pin: 0.9V±10%) can be divided using external resistors
(1kΩ to 20kΩ). The resulting value can be input as the set voltage. It is also necessary to connect a resistor and
capacitor to the CR1 and CR2 pins in order to determine the PWM drive OFF time.
(b) PWM Constant-Current Control Operation
The motor current rises through the winding at a rate dependent upon the voltage and inductance of the winding.
If the RNF3 or RNF4 voltage reaches the threshold voltage set with the VLIM5 or VLIM6 voltage, the internal
current limiting comparator changes the logic of H-Bridges into short brake mode. Because both of low-side
DMOS transistors are on, the motor’s inductance causes the current to freewheel through them. During this
freewheeling time, the current decreases until the CR timer reaches constant OFF time (tOFF). After this sequence,
the high-side DMOS transistor is enabled to increase the winding current again. For repeating this cycle, the
motor winding current will be regulated by the motor’s inductance.
(c) Noise Cancellation Function
The device has a noise cancellation time (Tn) to blank detection of the motor winding current. A noise cancellation
time blanks the output of the current limiting comparator when the output transistors are switched. The noise
cancellation time defines the minimum on time for PWM constant current, and it depends on the internal resistor,
external resistor and capacitor of CR pin.
(d) CR Timer
The moment output logic are switched to short brake mode, the voltage of CR pin is clamped at approximately
0.9V. Because the external capacitor discharges toward ground through the external resistor during the short
brake mode, the voltage of CR pin decreases until approximately 0.4V. That time defines the OFF time (tOFF). As
soon as the voltage of CR pin reaches 0.4V, the external capacitor charges toward VCC voltage. That cycle
continues to repeat with the capacitor alternately charging and discharging. The interval over which the capacitor
charges from 0.4V to approximately 0.8V defines the noise cancellation time (Tn). The tOFF and Tn depend upon
the external resistor and capacitor values connected to the CR pin. Because a low-value resistor will prevent the
voltage of CR pin from reaching the clamp voltage, select within the range of 5kΩ to 50kΩ. The capacitor values
should be set within the range of 10pF to 2200pF. The use of a capacitor in excess of 2200pF will lengthen the
noise cancellation time and control the output current unstably. Setting a longer OFF time may reduce both the
average current and the motor rotational efficiency to increase the ripple of motor winding current.
Output Current Value IOUT[A] = VVLIM5[V] / RRNF3[Ω] or VVLIM6[V] / RRNF4[Ω]
Output current: IOUT[A]
Spike noise
PWM Constant-Current
setting value
0A
VLIM pin setting voltage
RNF voltage: VRNF[V]
CR voltage: VCR[V]
0V
0.9V
0.8V
Noise cancellation time: Tn[sec]
Discharge period
Off time: tOFF[sec]
0.4V
Charge period
Figure 1.
Peak Current Control PWM Constant-Current Drive with the CR Timer
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
5/16
TSZ02201-0H3H0B601380-1-2
09.Dec.2015 Rev.001

5 Page





BD6753KV arduino
BD6753KV
Power Dissipation
1.25
1.12W
1.00
0.75
0.50
0.67W
0.25
0.00
0
75°C
25 50 75 100 125 150
Ambient Temperature : Ta [°C]
Figure 5.
Power Dissipation vs Ambient Temperature
I/O Equivalent Circuits
PS
VCC
40kΩ
70kΩ
VLIM5, VLIM6,
SENSE3, SENSE4
VCC
1kΩ
STROBE, CLK, SDATA,
PWM1 to PWM6
VCC VCC
10kΩ
100kΩ
CP3, CP1
VCC
VCC
VMx, OUTxA, OUTxB,
RNFx
VMx
CPH1, CPL1
VCC
VCC
OUTxA
OUTxB
VCC
RNFx
VG, CP4, CP2
VG
VM1
CP4
CP2
100kΩ
CR1, CR2
VCC
5kΩ
VCC
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111 15 001
11/16
TSZ02201-0H3H0B601380-1-2
09.Dec.2015 Rev.001

11 Page







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