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STSPIN820 Folha de dados(PDF) 16 Page - STMicroelectronics

Nome de Peças STSPIN820
Descrição Electrónicos  Advanced 256 microsteps integrated motor driver with step-clock and direction interface
PDF  29 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STSPIN820 Folha de dados(HTML) 16 Page - STMicroelectronics

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Functional description
STSPIN820
16/29
DocID031065 Rev 2
5.3
PWM current control
The device implements two independent PWM current controllers, one for each full-bridge.
The voltage of the sense pins (VSNSA and VSNSB) is compared to the respective internal
reference voltage based on the sequencer value (seeTable 8 and Table 9).
When VSNSX > VREFX the integrated comparator is triggered, the OFF time counter is
started and the decay sequence is performed.
The decay sequence starts turning on both the low sides of the full-bridge (slow decay),
after the behavior of the PWM current control depends on the DECAY input:
When the DECAY input is low (mixed decay): the system switches from slow decay
to quasi-synchronous fast decay (the sinking side of the bridge is put in high
impedance) when the counter reaches a fixed threshold corresponding to a 5/8th of the
total decay time (tOFF).
As soon as the counter reaches the end of the count it is reset and the bridges return in
the ON state.
When the DECAY input is high (slow decay only): the system stays in slow decay
until the counter reaches the end of the count, then it is reset and the bridges returns in
the ON state.
The description of the ON, slow decay and fast decay status are listed in Table 11.
The reference voltage value, VREF, has to be selected according to the load current target
value (peak value) and the sense resistors value.
Equation 1
VREF = RSNS · ILOAD,peak
Table 11. ON, slow decay and fast decay states
Current direction(1)
1. The current direction is set according to Table 8 or Table 9.
ON
Slow decay
Fast decay
(quasi-synch.)
Zero
(power bridge
disabled)
HSX1 = OFF
LSX1 = OFF
HSX2 = OFF
LSX2 = OFF
HSX1 = OFF
LSX1 = OFF
HSX2 = OFF
LSX2 = OFF
HSX1 = OFF
LSX1 = OFF
HSX2 = OFF
LSX2 = OFF
X1 → X2
HSX1 = ON
LSX1 = OFF
HSX2 = OFF
LSX2 = ON
HSX1 = OFF
LSX1 = ON
HSX2 = OFF
LSX2 = ON
HSX1 = OFF
LSX1 = ON
HSX2 = OFF
LSX2 = OFF
X1 ← X2
HSX1 = OFF
LSX1 = ON
HSX2 = ON
LSX2 = OFF
HSX1 = OFF
LSX1 = ON
HSX2 = OFF
LSX2 = ON
HSX1 = OFF
LSX1 = OFF
HSX2 = OFF
LSX2 = ON



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