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TMC9660 Datasheet(PDF) 42 Page - Analog Devices

Part # TMC9660
Description  70V Smart Gate Driver with Servo (FOC) Controller in HW and Buck Converter
PDF  101 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

TMC9660 Datasheet(HTML) 42 Page - Analog Devices

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TMC9660
70V Smart Gate Driver with Servo (FOC)
Controller in HW and Buck Converter
www.analog.com
Analog Devices | 42
������������������������������ = ������������������������ × ������������
where
QG is the total gate charge and fPWM is the chopping frequency.
Since the doubler, which generates the drive voltage supply (VDRV), is capable of up to 50mA, the following relation must
be satisfied:
������ × ������������������������ × ������������ ≤ 50������������
where
N is the total number of external FETs (in particular N = 6 for three-phase BLDC/PMSM motors and N = 8 for two-phase
steppers).
For example, when driving a BLDC motor (N = 6) at fPWM = 25kHz, the Equivalent Total Gate Charge must be less than
300nC.
Integrated active and passive pull-down resistors avoid crossbar conduction of the external half-bridge when the gate
driver outputs are three-stated or when the part is in low-power mode. No external pull-down resistors are needed.
600mA BUCK
5.8V OUT
0.68MHz
LS CHARGE
PUMP
DOUBLER
50mA
VDRV
CPI
CPO
VSA
SW
VBUCK
TRICKLE
CHARGE
PUMP
BOOSTRAP
SWITCH
HS
12kΩ
CBST
VS
LS
12kΩ
150kΩ
BS_X
HS_X
BM_X
LS_X
CSP_X
GATE DRIVER
CONTROLLER
SLOPE CONTROL
AND SEQUENCER
TMC9660
VS
VS
VSA
CURRENT
LIMITER
CSN_X
Figure 20. Gate Driver Topology Showing One Half-Bridge
Slew Rate Control
The gate driver output currents are user programmable to enable slope control of the motor phase voltages. This
eliminates the external gate resistors which are commonly used for this purpose. Moreover, source and sink currents can
be independently configured for maximum flexibility.



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