TMC6130 DATASHEET (Rev. 0.90 / 2014-MAR-10) PRELIMINARY
10
3 Currents and Current Control
3.1 Supply Systems
The current for operation of the system is supplied via VM and VCC. VCC supplies the IOs, and the amplifier.
In case VCC is supplied with a limited output impedance (for instance from a microcontroller IO), the
performance of the amplifier may be affected. VM supplies the internal operation and the charge pump.
There are two possibilities to connect the boost current capacitor to the TMC6130. For charge pump
mode 0 (default setting), connect it to VCP as shown in Figure 3.1.
CBOOST
ITOT
IDIODE_CP
ITOT
IDIODE_CP
+VBAT
+VBAT
ILOAD
VCP
ILOAD
VCP
CM IM
CCP
CM IM
CCP
CBOOST
VM
VM
VCP_SW
VCP_SW
IM_CP
IM_CP
VCP_REG
VCP_REG
IM_INT
IM_INT
VREG
VREG
+3.3V
SLEEP
+3.3V
SLEEP
ICC
VCC
ICC
VCC
VCPx
HSx
VCPx
HSx
BHx
BLx
BHx
BLx
ENABLE
ENABLE
BMx
LSx
BMx
LSx
ERROR
ERROR
CURRENT
CURRENT
*17.2
*17.2
Charge Pump Mode = 0
Charge Pump Mode = 1
Figure 3.1 Power supply systems: CPMODE = 0 and CPMODE = 1
STANDARD OPERATION: CHARGE PUMP MODE = 0
The standard operation of the charge pump is to ensure sufficient gate voltage to the bootstrap
capacitors in case of low voltage conditions. VBOOST is regulated compared to GND level. The charge
pump will not be switching when VM > VREG+2*VF with VF = forward voltage of charge pump diodes.
CHARGE PUMP MODE = 1
(has to be programmed and stored in EEPROM via SPI)
Alternatively, the charge pump can regulate VBOOST compared to VM. In this case the CBOOST capacitor
should be connected to VM to ensure any supply variations are coupled to the VBOOST level. The
disadvantage is an additional amount of dissipation inside the pre-driver to regulate VREG.
The default configuration is stored in the integrated EEPROM. In case CPMODE1 is desired, it is necessary
to change EEPROM configuration bits (using the SPI interface or via bit banging).
www.trinamic.com
TRINAMIC [ TRINAMIC MOTION CONTROL GMBH & CO. KG. ]
